Lewis AX 18/20mm 4-Piston Brakes — Built For DH & Enduro

Peak power. Total control. Zero compromises.
The Lewis AX brings downhill-level stopping power with an adjustable feel that you can fine-tune on the trail. Built from CNC-machined 7075-T6 aluminum and loaded with 18/20mm stainless steel pistons, this 4-piston system is engineered for riders who push limits—from enduro stages to bike-park laps.

Why Riders Choose the AX

• Triple Adjustments: Tool-free reach & bite point + adjustable leverage ratio for customized modulation and power.
  
  
• DH-Ready Power: 4-piston system with 18mm + 20mm insulated stainless pistons for consistent performance under heat.
  
  
• Thermal Stability: Independent cooling fins improve heat dissipation on long descents.
  
  
• Upgraded Reliability: New anti-oil-loss connector and improved leverage adjustment knob.
  
  
• Premium Materials: 7075-T6 aluminum construction, stainless hardware, and braided T200 oil hose.

Performance Adjustments

• Lever Reach Adjustment (Tool-Free)
  Quickly set the lever distance from the bar for the perfect fit and faster reaction time.
  
  
• Bite Point Adjustment (Tool-Free)
  Fine-tune lever free-play instantly—no tools needed.
  
  
• Leverage Ratio Adjustment
  Dial in your braking feel:
  • More modulation
  • More bite
  • More overall power
    
    
• Loosen the two set screws with a 1.5mm key, rotate the ratio knob, tighten the screws—done.

Power & Consistency Under Heat

• 4-Piston System: Two 18mm + two 20mm pistons with insulation layers preserve power when the trail gets steep.
  
  
• Cooling Fins: Independent fin design improves thermal management for hard DH braking.

Technical Specs

Master Cylinder

• Type: Axial
• Material: CNC 7075-T6 Aluminum
• Finishes: Black or Silver
• Clamp: Split clamp, Black or Silver
• Adjustments:
  
  • Lever Reach — Tool-Free
  • Bite Point — Tool-Free
  • Leverage Ratio — 1.5mm set-screw release
• Hardware: Stainless steel

Lever Blade

• Material: CNC 7075-T6 Aluminum
• Version: 1-Finger
• Colors: Black or Silver

Caliper

• Material: CNC 7075-T6 Aluminum
• Mount: Post Mount
• Pistons: 18mm + 20mm Stainless Steel
• Pads Included:
  • Sintered EP-44
  • Carbon Ceramic VP-40
• Color: Black or Silver

Brake Hose

• Braided T200 Mineral Oil Hose
• Size: 5mm OD / 2.2mm bore
• Lengths: 110cm Front, 180cm Rear
• Finish: Black

Weight

• Lever: 109g
• Caliper: 202g (without pads)
• Complete Single Brake (no pads/hose): 311g

Compatibility

• Intended Use: Downhill, Enduro, All-Mountain
• Rotor Options (Not Included): 180 / 200 / 203 / 220 / 223 mm
  
  
• Recommended Rotors:
  • Lewis 2.3mm rotors
  • Compatible with any 2.0–2.5mm rotor
    
    
• Adapters: Not included
• Oil: Mineral
• Bleed Kit: Lewis Bleed Kit recommended

The Lewis AX: Built for Riders Who Demand Power & Tunability

If you want a brake that matches downhill force with enduro adjustability, the AX delivers. Tuned feel, incredible modulation, and class-leading build quality—this is the upgrade that transforms your bike’s braking performance.

Lewis LHT: The New Standard in Precision Braking

The Lewis LHT Axial Cylinder 4-Piston Brake is a masterclass in CNC engineering, designed for riders who demand more than just stopping power; they demand perfection. Built for the rigors of Trail, All-Mountain, and Enduro riding, the LHT combines massive power with an incredibly refined lever feel that puts you in total control of every corner.

Milled from a single block of 7075 T6 Aluminum, the caliper offers exceptional rigidity. This stiffness translates directly to the trail: when you pull the lever, there is zero flex, just immediate, modulated power.

Why the Lewis LHT Stands Out:

• Ultimate Tunability (3-Way Adjustment): Most brakes only offer reach adjustment. The LHT offers three adjustments which we call the "Lewis Trifecta": Lever Reach, Bite Point, and Lever Ratio. This rare feature allows you to tune the mechanical advantage of the lever to be either "Linear" (smooth modulation) or "Progressive" (snappy, on/off power).
  
  
• Hybrid Piston Technology: The caliper houses 4 x 17mm pistons made from a hybrid of Titanium piston and Ceramic insulator. The ceramic core insulates the fluid from heat, while the titanium shell provides unmatched durability.
  
  
• Titanium Hardware Standard: We don't cut corners. Premium Titanium bolts are used throughout the entire brake kit. This maximizes strength-to-weight efficiency, ensuring your hardware will never rust or corrode.
  
  
• Kevlar Braided Hoses: Say goodbye to flimsy stock hoses. The LHT comes pre-installed with steel/Kevlar braided hoses that prevent expansion under pressure, ensuring your brake feel stays solid even during panic stops.
  
  
• Maintenance Friendly: The advanced anti-leak oil system simplifies bleeding, and the brakes run on standard Mineral Oil, making them safe and easy to service in your home shop.

Mechanic's Note: Worried about finding replacement pads? The Lewis LHT is compatible with Hope V4 pads, meaning you can find replacement pads at almost any bike shop in the world.

Configuration & Setup:

These brakes are sold in the standard configuration:

• Left Lever: Front Brake (90cm Hose)
• Right Lever: Rear Brake (160cm Hose)

Note: Prefer your brakes "Moto" style (Right/Front, Left/Rear)? The levers are designed to be reversible. You can swap the hydraulic hoses easily to suit your riding preference.

Specifications:

• Pistons: 4 x 17mm (Titanium & Ceramic Hybrid)
• Material: CNC 7075 T6 Aluminum
• Hardware: Titanium & Stainless Steel
• Fluid: Mineral Oil
  
• Adjustments: Reach, Bite Point, Leverage Ratio
• Pad Compatibility: Hope Tech 3 V4 / Lewis TP-40 / VP-40 / LP-40
• Weight: ~639g (Pair including hoses)

Lewis LHP-U4: Ultimate 4-Piston Breaking Power

The Lewis LHP-U4 Axial Cylinder Brake is engineered for the most demanding mountain biking disciplines. Whether you are racing Downhill, charging Enduro stages, or tackling technical All-Mountain terrain, the LHP-U4 delivers consistent, fade-free power.

Machined from CNC 7075 T6 Aluminum, this brake system prioritizes rigidity and heat management. The massive 4-piston caliper features independent cooling fins and huge oil reserves, ensuring that your braking power stays consistent from the top of the mountain to the bottom.

Key Performance Features:

• Triple Adjustability: Just like its big brother (the LHT), the LHP-U4 features the "Lewis Trifecta" of adjustments. You can tune the Lever Reach, the Bite Point, and the Leverage Ratio. This allows you to toggle between a snappy, aggressive bite or a linear, modulated feel.
  
  
• Heat Management System: The caliper houses 4 x Stainless Steel Pistons equipped with special insulating layers. Combined with the machined cooling fins on the caliper body, this design isolates the hydraulic fluid from brake heat, preventing "pump up" or fade during intense braking.
  
  
• Rigid CNC Construction: The 7075 T6 Aluminum body is lightweight yet incredibly stiff, translating your finger input directly into stopping power without the flex found in cast brakes.
  
  
• Anti-Leak Technology: Features advanced seal designs to ensure air-tight performance and simplified bleeding maintenance.

Mechanic's Note (Pad Compatibility): The LHP-U4 caliper is typically compatible with Hope E4 brake pads. This means finding replacement pads, whether sintered or metallic, is easy at almost any bike shop.

Important: Installation & Fitment Guide

Caliper Clearance Warning: The LHP-U4 features a robust, oversized CNC-caliper body. On certain forks (specifically the Fox 36), standard flat adapters may cause clearance issues.

• We strongly recommend using the Lewis PM-PM+20-A Adapter.
  
  
• This "A" model is specifically shaped to provide the necessary clearance for the LHP caliper body.
  
  
• If you are using a 200mm rotor with a 180mm post mount fork (standard Fox 36 setup), the "A" adapter is the safest choice to ensure a rub-free installation. If you're running a 220mm rotor on a 180mm post mount fork, consider our 40mm Adapter, available here.

Configuration:

These brakes are sold in the standard configuration:

• Left Lever: Front Brake
• Right Lever: Rear Brake

Note: The levers are fully reversible (Flip-Flop design). If you prefer "Moto Style" (Right/Front), you can simply swap the hoses during installation.

Specifications:

• Application: Downhill / Enduro / All-Mountain
• Pistons: 4 x Stainless Steel (with insulating inserts)
• Material: CNC 7075 T6 Aluminum
• Fluid: Mineral Oil
• Pad Compatibility: Hope Tech 3 E4 / Lewis VP-37 / Lewis TP-37 / Lewis LP-37
• Adjustments: Reach, Bite Point, Leverage Ratio
• Colors: Black, Silver

Lewis LH4: Premium CNC Braking Performance

The Lewis LH4 Axial Cylinder Brake brings boutique-level CNC quality to the trail at an accessible price point. Engineered for Downhill, Enduro, and All-Mountain riding, the LH4 strikes the perfect balance between raw stopping power and refined modulation.

Constructed from CNC-machined 7075 T6 Aluminum, the LH4 is significantly stiffer than standard cast brakes. This rigidity ensures that every millimeter of lever pull translates directly into braking force, giving you confidence on the steepest descents.

Key Features:

• Dual-Diameter Piston Technology: The caliper utilizes an asymmetric 4-piston layout (2 x 14mm and 2 x 17mm). The smaller pistons engage slightly earlier to ensure smooth initial modulation, while the larger pistons provide the raw clamping force required for maximum stopping power.
  
  
• Tool-Free Dual Adjustment: Fine-tune your cockpit in seconds. The LH4 features patented external dials for Lever Reach (Tool-free) and Bite Point (Hex key needed, thumb tool included) adjustment, allowing you to customize exactly where the lever sits and where the power kicks in.
  
  
• Ultra-Smooth Lever Feel: Unlike budget brakes that use bushings, the LH4 lever pivots on precision sealed bearings. This results in a frictionless, feather-light lever action that reduces hand fatigue on long runs.
  
  
• Robust Build Quality: Features split clamps for easy installation and Kevlar-reinforced hoses to prevent hydraulic expansion and loss of power under heavy load.

Mechanic's Note (Pad Compatibility): The Lewis LH4 is designed to use Hope Tech 3 E4 brake pads. This large pad shape provides excellent heat management and modulation.

Configuration:

These brakes are sold in the standard configuration:

• Left Lever: Front Brake
• Right Lever: Rear Brake

Note: The levers feature a "Flip-Flop" design. If you ride "Moto Style" (Right/Front), you can easily unbolt and swap the hoses to reverse the configuration.

Specifications:

• Application: Downhill / All-Mountain / Trail
• Pistons: 4 Asymmetric (2x14mm, 2x17mm)
• Material: CNC 7075 T6 Aluminum
• Fluid: Mineral Oil
• Adjustments: Reach (Tool Free) & Bite Point
• Pad Compatibility: Hope Tech 3 E4 / Lewis VP-37 / Lewis TP-37 / Lewis LP-37
• Colors: Black, Silver

Lewis EB 20-21: The Heavyweight Champion of Braking

The Lewis EB 20-21 Axial Cylinder Brake is not a standard mountain bike brake. It is a dedicated heavy-duty system engineered specifically for E-Motos (Surron, Talaria, E-Ride Pro) and full-power E-MTBs. When your machine weighs over 100lbs, and you are hitting downhill speeds, standard bicycle brakes just don't cut it. The EB 20-21 delivers the hydraulic volume and thermal mass needed to safely stop heavy electric builds, lap after lap.

Built around a massive Oversized Axial Master Cylinder, this system pushes significantly more fluid than a traditional lever. This is required to feed the monster caliper, resulting in a firm lever feel and immediate piston engagement without the "mushy" feeling common in other brakes.

Why the EB 20-21 is the Standard for E-Moto:

• Massive 20mm & 21mm Pistons: While standard DH brakes use ~17mm pistons, the EB 20-21 uses a gargantuan 2x20mm + 2x21mm asymmetrical layout. This increased surface area generates an immense clamping force to stop heavy electric bikes instantly.
  
  
• Thick Rotor Compatibility (3.0mm): Heat is the enemy of E-Moto brakes. The EB 20-21 is designed to work with extra-thick 2.3mm to 3.0mm rotors (like the Lewis HD220). These thick rotors absorb far more heat without warping than standard 1.8mm bicycle rotors.
  
  
• TITAN Ceramic Insulation: The pistons feature TITAN ceramic inserts that act as a thermal firewall. They prevent the intense heat from the pads from boiling your hydraulic fluid, ensuring your lever stays firm even at the bottom of a 20-minute descent.
  
  
• Braided Kevlar Hoses: Say goodbye to hose expansion. The kit comes pre-installed with T200 Kevlar-braided hoses, ensuring that your hydraulic pressure goes directly to the caliper, not into expanding the line.

Mechanic's Note (Pad & Rotor):
1. Pads: This caliper is huge. It uses Lewis EP-44 Sintered Metallic pads. These are larger than standard bicycle pads to handle the heat and torque of E-Moto riding.

2. Rotors: For best performance, we highly recommend pairing these with 2.3mm or 3.0mm thick rotors. Using standard thin rotors may result in excess lever throw.

Configuration:

These brakes are sold in the standard configuration:

• Left Lever: Rear Brake (165cm Hose)
• Right Lever: Front Brake (90cm Hose)

Note: The levers feature a "Flip-Flop" design. If you prefer "MTB Style" (Right Rear), you can swap them to reverse the configuration.

Specifications:

• Application: Surron / Talaria / E-Ride Pro / Heavy E-MTB
• Pistons: 4 Asymmetric (2x20mm, 2x21mm)
• Material: CNC 7075 T6 Aluminum
• Fluid: Mineral Oil
• Adjustments: Tool-Free Reach Adjust
• Pad Standard: Lewis EP-44 (Sintered Metallic Included)
• Rec. Rotor Thickness: 2.3mm – 3.0mm
• Weight: ~334g (Single brake w/o hose/pads)

Lewis LV4 4-Piston Hydraulic Disc Brake Kit

Radial-cylinder precision, 4-piston power, and premium CNC construction for trail, enduro, and gravity riding.

The Lewis LV4 is designed for riders who want a firmer, more direct brake feel paired with the power of a modern 4-piston caliper. Built around Lewis’s radial master cylinder design and a lightweight CNC-machined lever body, the LV4 delivers fast engagement, strong feedback at the lever, and powerful stopping performance for demanding trail, enduro, and e-MTB riding.

Paired with a 4-piston caliper, the LV4 is built to deliver serious braking control without the excessive bulk of many gravity-oriented brake systems. The combination of a stiff lever architecture, large piston layout, and precision-machined aluminum construction gives riders a brake that feels responsive, planted, and powerful on steep terrain and sustained descents.

Key Features & Benefits

• Radial Master Cylinder Design: The Lewis Vertical design places the master cylinder in a radial orientation to create a more direct, responsive lever feel.
• 4-Piston Caliper Power: Built for stronger braking force and improved heat management compared with lighter-duty trail brake systems.
• Asymmetric Piston Layout: Uses 2 x 14 mm and 2 x 17 mm stainless steel pistons to balance smooth engagement with strong overall clamping force.
• Dual Adjustment: Features tool-free reach adjustment and bite point adjustment so riders can fine-tune lever position and brake feel.
• 4 Sealed Cartridge Bearings: Lever pivots on sealed bearings for smoother action, reduced play, and a more refined lever feel.
• CNC 7075-T6 Aluminum Construction: Precision-machined aluminum body and caliper provide stiffness, strength, and premium finish quality.
• Mineral Oil System: Designed around a mineral oil braking platform with Kevlar braided hoses.

Ride Feel & Performance

• Firm, direct lever response
• Strong braking power for aggressive riding
• Excellent control on steep descents
• Low-weight feel for a 4-piston brake system
• Well suited for trail, enduro, DH, and e-MTB use

The Lewis LV4 is a strong choice for riders who want a more immediate brake feel than a softer, more progressive system while still retaining the control and adjustability needed for technical terrain.

Mechanic’s Note: Pad Compatibility

The Lewis LV4 uses the Hope Tech 3 E4 pad shape, making replacement pad sourcing easier and giving riders access to multiple pad compound options.

Configuration

These brakes are sold in the following standard configuration:

• Left Lever: Front Brake (90 cm hose)
• Right Lever: Rear Brake (160 cm hose)

Note: For riders who want to use a moto-style brake setup (Left/Rear & Right/Front), you can swap the brake hose positions at the levers to reverse the configuration.

What’s in the Box?

• Front and rear LV4 caliper + lever assemblies (pre-assembled with brake line)
• Mounting hardware (stainless bolts and washers)
• Lewis brake pads

Specifications

• Product Name: Lewis LV4 4-Piston Hydraulic Disc Brake Kit
• Intended Use: Trail / DH / Trials / All-Mountain
• Master Cylinder: Radial (Lewis Vertical)
• Pistons: 4 x Stainless Steel (14 mm + 17 mm)
• Material: CNC 7075-T6 Aluminum
• Fluid: Mineral Oil
• Adjustments: Tool-free reach adjust and bite point adjust (Not tool free)
• Pad Compatibility: Hope Tech 3 E4 / Lewis VP-37 / Lewis TP-37 / Lewis LP-37
• Hoses: Kevlar Braided
• Weight: Approx. 597 g per pair with hoses

Ideal For

The Lewis LV4 is ideal for riders looking for a powerful 4-piston mountain bike brake with a firm lever feel, radial-cylinder response, and premium CNC construction. It is especially well suited for aggressive trail riders, enduro racers, DH riders, and e-MTB riders who want strong braking with a more direct character.

Lewis AE Axial Cylinder Brake Set

Firm lever feel, powerful monoblock braking, and premium CNC construction at a more accessible price point.

The Lewis AE is designed for riders who want a strong, immediate brake feel with premium materials and serious stopping power. Built around a one-piece monoblock CNC caliper and an axial master cylinder, the AE delivers a direct, solid lever feel with the kind of control and consistency aggressive riders look for in trail, enduro, and downhill braking.

Lewis developed the AE for riders who prefer a firmer, more substantial lever character. Compared with a lighter, more progressive brake feel, the AE gives stronger feedback at the lever and a more immediate bite point. For riders who like a more decisive braking response, the AE is built to feel powerful, planted, and confidence-inspiring on steep terrain.

Why the Lewis AE Stands Out

• Monoblock CNC Caliper: The AE uses a one-piece monoblock 7075-T6 aluminum caliper instead of a more common two-piece design. This helps reduce caliper flex and supports more direct, consistent braking power.
• Axial Master Cylinder: The axial cylinder layout creates a crisp, responsive engagement point with a firm lever feel that many aggressive riders prefer.
• 4-Bearing Lever Pivot: The lever rides on 4 sealed cartridge bearings rather than basic bushings, helping improve smoothness, reduce lever play, and support long-term durability.
• Asymmetric 4-Piston Layout: The caliper uses 2 x 14 mm and 2 x 17 mm stainless steel pistons to balance initial control with strong overall stopping power.
• Premium CNC Finish: Precision-machined construction gives the AE a higher-end look and feel than many brakes in the same category.
• Mineral Oil System: Designed around mineral oil operation for riders and mechanics who prefer that brake fluid platform.

Ride Feel & Performance

• Firm, substantial lever feel
• Strong initial bite with solid feedback
• Consistent braking under heavy use
• Well suited for trail, enduro, and downhill riding

The Lewis AE is a strong choice for riders who want a brake that feels direct and decisive at the lever while still offering the refinement of CNC construction, sealed lever bearings, and a rigid monoblock caliper.

Mechanic's Note: Pad Compatibility

The Lewis AE uses the Hope Tech 3 E4 pad shape, also referenced in the Lewis lineup as TP-37 / LP-37. This makes replacement pad sourcing easier and provides access to a broad range of pad compounds.

Configuration

These brakes are sold in the following standard configuration:

• Left Lever: Front Brake (90 cm hose)
• Right Lever: Rear Brake (165 cm hose)

Note: The levers use a flip-flop design. Riders running moto-style brake setup can swap hose positions to reverse the configuration.

What’s in the Box?

• Front and rear AE caliper + lever assemblies (pre-bled)
• Mounting hardware (stainless bolts and washers)
• 2 hose fittings / olives for shortening hoses
• Bleed blocks
• Lewis brake pads (pre-installed)

Specifications

• Product Name: Lewis AE Axial Cylinder Brake Set
• Intended Use: Enduro / Trail / Downhill
• Master Cylinder: Axial
• Lever Feel: Firm
• Pistons: 4 x Stainless Steel (14 mm + 17 mm)
• Caliper Material: Monoblock CNC 7075-T6 Aluminum
• Fluid: Mineral Oil
• Adjustment: Tool-Free Reach Adjust
• Pad Compatibility: Hope Tech 3 E4 / Lewis VP-37 / Lewis TP-37 / Lewis LP-37
• Hoses: Braided (T150 Front / T200 Rear)
• Weight: Approx. 220 g per side (lever + caliper)

Ideal For

The Lewis AE is ideal for riders who want a firm-feeling 4-piston mountain bike brake with strong power, premium CNC construction, and easier replacement pad sourcing. It is especially well suited for aggressive trail riders, enduro racers, downhill riders, and anyone looking for a brake with a more direct, Shimano-like bite character in a premium package.

Lewis LV-S2: XC Weight, Enduro Cockpit

The Lewis LV-S2 redefines the lightweight brake category by pairing a featherweight 2-piston caliper with the race-proven LV4 Radial Master Cylinder. By utilizing the exact same lever assembly found on Lewis's LV4 brakes, the LV-S2 offers XC and Trail riders a level of stiffness, adjustability, and bearing-driven smoothness that is simply unheard of in the cross-country category.

While the caliper is slimmed down for speed, the lever provides the "big brake" feel. The Radial (Vertical) design orients the piston perpendicular to the handlebar, minimizing flex and providing a crisp, direct connection to the rotor. If you want the snap and modulation of an enduro brake in a package light enough for a World Cup race bike, this is it.

The "LV" Advantage (Lever Tech):

• Shared LV4 Radial Platform: The S2 uses the same skeletonized CNC lever body as the DH-rated LV4. This radial design reduces "squish" and flex, delivering immediate engagement that standard axial XC brakes can't match.
  
  
• Frictionless 4-Bearing Pivot: Most lightweight brakes use bushings to save grams. The LV-S2 refuses to compromise, utilizing 4 precision sealed cartridge bearings in the lever pivot. The result is a feather-light lever action that eliminates hand fatigue.
  
  
• Dual Adjustability: Complete control over your setup. Features Tool-Free Reach Adjustment (dial) to set the lever distance, and Bite Point Adjustment (via 2mm Allen key) to customize exactly where the power kicks in.

Caliper & Power:

• Oversized 21mm Pistons: While most 2-piston brakes use 19mm internals, the LV-S2 packs Dual 21mm Stainless Steel Pistons. This massive surface area generates significantly more clamping force, allowing this compact caliper to punch far above its weight class.
  
  
• Featherweight Construction: Despite the overbuilt lever and oversized pistons, the extensive CNC machining keeps the weight at just ~300g per set (levers & calipers, excluding hoses).

Mechanic's Note (Pad Compatibility): The LV-S2 uses Lewis LP-30 / TP-30 brake pads. These are specifically shaped to cover the larger 21mm pistons for maximum heat management. 

Configuration:

These brakes are sold in the standard configuration:

• Left Lever: Front Brake (90cm Hose)
• Right Lever: Rear Brake (165cm Hose)

Note: The levers feature a "Flip-Flop" design. If you ride "Moto Style" (Right/Front), you can easily unbolt and swap the hoses to reverse the configuration.

Specifications:

• Intended Use: XC / Downcountry / Trail / Dirt Jump / Trials
• Lever Platform: Lewis LV Radial (Vertical)
• Pistons: 2 x 21mm Stainless Steel
• Material: CNC 7075 T6 Aluminum
• Fluid: Mineral Oil
• Hoses: Kevlar Braided
• Pad Compatibility: SRAM Level / Elixir / Lewis VP-30 / Lewis TP-30 / Lewis LP-30
• Weight: ~300g (Set without hoses) / ~412g (Complete with hoses)

Lewis SLR Lightweight Flat Mount Road Brake Caliper

Ultra-light construction, larger titanium pistons, and precision braking performance for serious road riders.

The Lewis SLR is the lightest flat mount road brake caliper Lewis has produced, built for hill-climb bikes, premium road builds, and riders focused on reducing weight without giving up braking confidence. Precision CNC-machined from 7075-T6 aluminum and equipped with titanium pistons and titanium hardware, the SLR weighs just 68.5 g for the caliper body alone. The result is an exceptionally light flat mount road disc brake caliper designed for performance-driven builds where every gram matters.

Low weight is only part of the story. The Lewis SLR uses dual 21 mm titanium pistons, which are larger than the 19 mm pistons commonly found in many stock road calipers. That larger piston size helps deliver stronger, more consistent braking force with improved control at the lever. Lewis also engineered a generous 0.3 mm pad clearance per side, helping reduce rotor rub, unwanted brake noise, and the constant pad drag issues that can frustrate riders on modern aero road bikes.

Why Choose the Lewis SLR?

• Extremely Lightweight Design: At just 68.5 g for the caliper body, the SLR is a serious upgrade for riders building lightweight road, climbing, and race bikes.
• Larger 21 mm Titanium Pistons: Oversized pistons improve braking power and lever consistency while titanium helps reduce heat transfer into the brake fluid.
• Improved Heat Management: Titanium pistons act as a thermal barrier, helping control heat buildup on long descents and reducing the chance of fluid overheating.
• Reduced Rotor Rub: The optimized piston and return spring design, combined with wider pad clearance, helps keep the rotor running quieter and freer.
• Choice of Fluid System: Available in both Mineral Oil and DOT 5.1 versions so you can match the caliper to your lever setup.
• Premium Materials Throughout: CNC-machined 7075-T6 aluminum body with titanium hardware for strength, precision, and reduced weight.
• Flat Mount Road Fitment: Designed for modern flat mount road and gravel applications using 34 mm flat mount spacing.

Features & Benefits

• 7075-T6 Aluminum Caliper Body: High-strength aluminum construction keeps weight low while maintaining the rigidity needed for precise braking feel.
• Titanium Pistons: Larger titanium pistons improve power delivery and help isolate heat for more reliable braking under heavy use.
• Titanium Hardware: Lightweight fasteners and fittings further reduce system weight without compromising the premium feel of the caliper.
• 0.3 mm Pad Clearance Per Side: Increased clearance helps minimize pad drag, brake rub, and unwanted noise while making wheel installation easier.
• Patented Return Spring and Piston Design: Helps ensure full pad retraction for quieter operation and a more refined riding experience.
• Fluid-Specific Seal Options: Lets riders pair the correct caliper with Shimano, Campagnolo, Magura, SRAM, or Avid lever systems.

Technical Specifications

• Product Name: Lewis SLR
• Product Type: Lightweight flat mount road brake caliper
• Material: CNC 7075-T6 Aluminum
• Pistons: 2 x 21 mm Titanium
• Hardware: Titanium bolts and fittings
• Mount Standard: Flat Mount (34 mm spacing) Matching Adapter Here
• Pad Compatibility: SRAM Level / Elixir / Lewis VP-30 / Lewis TP-30 / Lewis LP-30
• Weight: 68.5 g (caliper body only)
• Colors: Black, Silver, Pink, Gold, Orange, Purple

Who It Is For

The Lewis SLR flat mount caliper is ideal for hill-climb riders, weight-conscious road cyclists, performance gravel riders, and premium custom bike builds where lower weight, better brake feel, and reduced rotor rub matter. It is especially well suited for riders looking for a lightweight road disc brake caliper with more braking power than a typical stock setup.

Mechanic's Data: Torque Specifications

The SLR includes two hose fitting types. Identify which fitting you are using before tightening, as over-torquing can damage lightweight threads and fittings.

Configuration Note: Fluid Type

Select the correct version for your brake levers:

• Mineral Oil Version: Compatible with Shimano, Campagnolo, and Magura systems.
• DOT Version: Compatible with SRAM and Avid systems.

Warning: Using the wrong brake fluid will permanently damage the internal seals and void the warranty.