The e*thirteen Helix Race Alloy e*spec Crank Arm Set in black is a great choice for riders who prefer alloy over carbon fiber. It's a high - performance, weight - optimized option. These cranks feature a 24mm ISIS interface and are designed to work with multiple motor systems like Bosch Gen 4, Brose S Mag, TQ HPR 50, Fazua, Yamaha, Maxon, and Specialized Brose. With short lengths starting at 155mm, they offer improved pedal clearance and have passed E - Enduro standards tests. The pedal spindle is 9/16', and it's specifically made for e - bikes.

Using this e*thirteen crank arm set is easy. Just install it on your e - bike following the standard installation procedures for your specific motor system. When riding, you'll notice the improved pedal clearance, especially with the 155mm length. As for maintenance, regularly check the self - extractor to make sure it's in good condition. Keep the cranks clean by wiping them down after each ride, especially if you've been riding in dirty or wet conditions. If you notice any unusual noises or looseness, stop using the bike and check the installation. Avoid using harsh chemicals on the black finish to keep it looking good.