ATTENTION: This sprocket is for QS 138 70H motors that were made in 2020 and early 2021. Please measure your QS 138 70H motor shaft before ordering this sprocket. This sprocket is 16mm diameter measuring from inner diameter of shaft and 20mm measuring the outer diameter of the shaft. Please also check the sprocket drawing in the images to insure that the spline width is accurate to your motor shaft. QS is notorious for changing their shaft sizes so please note that AmpSprockets cannot be responsible for returns if you order the wrong size for your motor.

High performance sprocket made specifically to fit the spline shaft QS Motor 138 3000W 70H V2 Motor. Sprocket comes complete with ring retainer clip. This sprocket works well with 420 standard and O-ring chains.