Lewis SLR Lightweight Road Bike Caliper

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.