Wide Crank Assembly 2 Stroke Bicycle Engine Kit Replacement Part Motorized Bike Compatible with 9/6th inch pedals. Will not be compatible with Micargi Beach Cruiser's stock pedals. These are intended to be used on a 26" cruiser style frame This part allows you to convert a 1 piece crank into a 3 piece crank. Wide cranks are required for 4-stroke or pull start bicycle engine kits.