5Dev R-Spec Shimano eCranks. Features: An evolution of the original, now exceeding the ISO Race standard Low profile crank arm reduces pedal strike during technical punchy climbs, allowing you to clean more sections of trail and get back up to take another lap with less effort Q Factor: 182mm when installed on Shimano EP8 Weight: 440g Please have cranks installed by an experienced eBike Mechanic. M6X1.0 bolts need to be tightened to 14N-m. Add Blue Loctite to each bolt and end cap. Check bolts after your first ride to make sure they are at the proper spec Specs: Model:R-Spec Shimano eCranks Length:155mm Spindle Interface:EP8 Spline Drive Q Factor:182mm Material:aluminum Color:black