Aeffect R eMTB brings the burly, purpose-driven design of Aeffect R to light-assist and full-power e-bikes. They're built for rowdy, power-down riding, yet at 485g Race Face puts them among the lightest alloy eMTB cranks on the market.

Highlights

• 7050 aluminium arms built for the loads of full-power e-bikes
• 485g (165mm arms only)
• 160, 165 and 170mm lengths, trimmed for better rock and root clearance on the shorter sizes
• Smooth-pedalling ergonomics in an extra-burly eMTB build
• Lifetime Warranty, crashes included
• ISIS motor interface: for Bosch Gen 2, Gen 4 CX and Gen 5 CX, and TQ HPR50 (not Bosch SX)

Ground control

Dial in your fit with 160, 165 or 170mm arms. The shorter sizes are trimmed to length for better clearance over rocks and roots, so you clip fewer pedals on technical climbs.

Built for e-bike loads

Race Face builds Aeffect R eMTB for the compatibility constraints and higher forces of full-power e-bikes, and covers it with its Lifetime Warranty, crashes included.

Compatibility & fit

Race Face's Aeffect R eMTB crank-motor compatibility chart lists this ISIS version as compatible with Bosch Gen 2 Performance Line, Bosch Gen 4 Performance Line CX / CX Race, Bosch Gen 5 Performance Line CX and TQ HPR50. Compatibility isn't guaranteed with Specialized / Brose, Giant / Yamaha and TQ HPR120. It isn't compatible with Bosch Performance Line SX, Bosch Gen 3 Performance Line / Active Line, Specialized / Mahle, Rocky Mountain Powerplay, Shimano STEPS and non-ISIS drive units. Riding a Bosch Performance Line SX? Choose the ISIS incl. Bosch SX version instead.

Chainrings aren't included. Crank fitting is a separate workshop service at Tune Cycles; tell us your bike and drive unit and we'll confirm the right interface before you order.

Sizes & options

Choose your arm length. Every length is the ISIS version described above.