Forged e*spec crank arms for e-MTB motors using the 21.5mm-offset ISIS spindle interface, with self-extracting bolts for easy removal at service time.

Highlights

  • 21.5mm ISIS offset spindle interface
  • Forged AL-6066-T6 aluminium arms
  • Self-extracting crank bolts
  • Moulded impact boots and pedal washers included
  • Black, 155mm / 160mm / 165mm

Compatibility & fit

e*thirteen's 21.5mm-offset ISIS crank arms are designed for Bosch SX, Brose S Mag, TQ HPR50/60 and Specialized 2.2/3.1 motors. Sold as arms only; order the matching e*spec chainring for your motor separately. The Tune workshop can fit these as part of an eMTB drivetrain service.

Options

Length
155mm
160mm
165mm
e*thirteen's standard warranty covers this product for 10 years against manufacturing and material defects; normal wear, crash damage and misuse aren't covered, though e*thirteen's Infinite Ride programme offers a discounted replacement after a crash. For warranty support, return the product to Tune Cycles and we'll manage the claim with e*thirteen's Australian distributor. This is in addition to your rights under the Australian Consumer Law, so keep your proof of purchase.
  • 21.5mm ISIS offset spindle interface
  • Forged AL-6066-T6 aluminium arms
  • Self-extracting crank bolts
  • Impact boots and pedal washers included
  • 155mm / 160mm / 165mm
Brande*thirteen
ModelHelix Core e*spec Crank
Motor fitBosch SX, Brose S Mag, TQ HPR50/60
Spindle interface24mm ISIS, 21.5mm offset
MaterialForged AL-6066-T6 aluminium
ColourBlack
Length options155mm / 160mm / 165mm
SKU DTW-ETG-CS5ESA-10-PAR
Brand e*Thirteen