Crafted with a skeletonized structural design, the Lewis ISIS Drive Crank Arms achieve an optimal strength-to-weight ratio. Their precision-machined 7075 aluminum alloy construction easily handles high-torque outputs from modern electric mountain bike drive systems, maintaining absolute rigidity during heavy pedalling efforts.
The shorter 155mm length helps keep your cadence smooth and efficient while providing crucial clearance over rocks, roots, and rutted trails. Finished in a durable anodised black with a multi-splined ISIS interface, these crank arms deliver direct power transfer and long-term reliability for rowdy off-road riding.
CNC-Machined 7075 Alloy: Lightweight hollow-pocket design built to handle high torque without adding unnecessary weight.
155mm Short Length: Provides increased ground clearance on technical terrain to prevent disruptive pedal strikes.
ISIS Spline Interface: Precision multi-splined fit ensures maximum interface engagement and creak-free power transfer.
Length: 155mm
Spindle Interface: ISIS Spline Standard
Material: CNC-Machined 7075 Aluminium Alloy
Colour: Anodised Black
Weight: N/A
✅ Technical e-MTB Riders: Perfect for riders who frequently strike pedals on rocky or root-filled trails and need extra clearance.
✅ High-Cadence Cyclists: Ideal if you prefer spinning a smooth, rapid cadence over pushing a heavy gear on steep climbs.
✅ Riders Wanting Sturdy Construction: CNC-machined 7075 aluminium alloy provides robust durability under heavy pedal loads.
❌ Non-ISIS Spindle Setups: Not compatible with square taper, Shimano Hollowtech II, SRAM DUB, or specialized non-ISIS spindles.
❌ Tall Riders Preferring Long Levers: Riders with long legs who prefer traditional 170mm or 175mm crank leverage may find 155mm arms too short.
❌ Pure Asphalt Commuters: Casual riders on flat, paved paths won't benefit as much from the added ground clearance of short cranks.
When swapping from standard 170mm or 175mm cranks down to 155mm arms, raise your seat post by roughly 15–20mm to compensate for the shorter radius at the bottom of your pedal stroke. You may also want to shift down one gear to maintain your preferred pedalling cadence!
