Working closely with Specialized, Praxis have created e-crank arms for many of their e-bikes. Simply pull off the stock aluminium crankarms and bolt on these carbon cranks for a lighter, higher performance setup on your Specialized e-bike. eCranks for the SL family of eBikes with the SL motor with Praxis alloy M30 spindle.MTB version for the Levo SL family.Left & Right Crankset | Alloy eCranks | Cold Forged Aluminium.165mm, 170mm and 175mm lengths.AL main crank bolt with self-extractor | M30 Bolt for ISIS eCranks.8mm Allen wrench for install/removal of cranks | 50Nm torque.Weight 485g+/-.Please Note: Alloy eCranks do NOT come with crank boot/protectors.