Lewis ALU MTB Aluminum Crankset

Lewis ALU Crankset

Gravity-ready stiffness, lightweight 7075-T6 construction, and precise power transfer for aggressive trail, enduro, and downhill riding.

The Lewis ALU Crankset is designed for riders who want the strength and confidence needed for modern gravity riding without unnecessary weight. Machined from premium 7075-T6 forged aluminum, this crankset weighs just 642 g while delivering the stiffness, durability, and precise pedal response demanded by hard enduro and downhill use. From rough bike park laps to technical trail riding, the Lewis ALU is built to handle heavy loads and repeated impacts while maintaining a direct, controlled ride feel.

At the center of the system is a 29 mm DUB-compatible spindle paired with an 8-bolt SRAM chainring interface, giving riders broad compatibility with modern drivetrain setups and fast, secure chainring changes. The crank arms feature a hollowed 3D lattice structure with reinforcement in key stress zones to improve torsional stiffness and strength while keeping overall weight low. The result is a crankset that feels solid under power and stable in demanding terrain.

Key Features & Benefits

• 7075-T6 Forged Aluminum Construction: High-strength forged aluminum delivers an excellent balance of low weight, stiffness, and long-term durability for aggressive riding.
• 29 mm DUB-Compatible Spindle: Designed around the SRAM DUB spindle standard for compatibility with a wide range of modern bottom bracket setups.
• 8-Bolt SRAM Chainring Interface: Allows secure direct-mount chainring installation and easy chainring changes.
• Hollow 3D Lattice Arm Design: Removes unnecessary mass while reinforcing high-stress areas for improved stiffness and strength.
• Gravity-Focused Performance: Built for riders who need confident power transfer and durability for downhill, enduro, and hard trail use.
• Lightweight for the Category: At 642 g, the crankset offers serious strength without the weight penalty of many heavier gravity-oriented options.

Important Fitment Note

These are SRAM DUB MTB cranks, not MTB Wide cranks. Always follow your bottom bracket manufacturer’s installation instructions and use the correct spacer configuration to achieve the proper chainline for your frame.

Bike Setup Examples

Trek Top Fuel Gen 4 — 55 mm chainline

• Bottom Bracket: SRAM BSA DUB bottom bracket
• Crankset: Lewis ALU 100 mm SRAM MTB
• Drive-Side Spacer: 4.5 mm
• Non-Drive-Side Spacer: 0 mm
• Crank Preload Adjuster: Tighten a few turns until just snug with no side-to-side play
• Chainring: 0 mm offset

Transition Patrol — 52 mm chainline

• Bottom Bracket: SRAM BSA DUB bottom bracket
• Crankset: Lewis ALU 100 mm SRAM MTB
• Drive-Side Spacer: 4.5 mm
• Non-Drive-Side Spacer: 0 mm
• Crank Preload Adjuster: Tighten a few turns until just snug with no side-to-side play
• Chainring: 3 mm offset

You can view the SRAM DUB bottom bracket guide here. If your bottom bracket manufacturer provides more specific spacer instructions, follow those instead.

Why This Crankset Stands Out

A high-quality MTB crankset needs to do more than survive impacts. It also needs to transfer power efficiently, stay tight under load, and work properly with modern bottom bracket and chainline standards. The Lewis ALU Crankset is built for exactly that, combining a lightweight forged alloy construction, DUB-compatible spindle, and modern direct-mount chainring interface in a package intended for aggressive riders who want dependable performance and cleaner drivetrain integration.

Specifications

• Product Name: Lewis ALU Crankset
• Material: 7075-T6 Forged Aluminum
• Weight: 642 g
• Spindle Diameter: 29 mm
• Spindle Standard: SRAM DUB MTB
• Chainring Interface: 8-bolt SRAM
• Crank Arm Length: 162.5 mm
• Frame Support: 29 x 100 mm Boost
• Bottom Bracket Compatibility: BSA 68/73 mm threaded and compatible pressfit bottom brackets
• Color Options: Black, Gunsmoke, Nebula

Ideal For

The Lewis ALU Crankset is ideal for riders looking for a lightweight gravity crankset with SRAM DUB MTB compatibility, strong power transfer, and modern direct-mount chainring fitment. It is especially well suited for enduro, downhill, bike park, and aggressive trail builds where stiffness, durability, and correct chainline setup all matter.