Bicycle Wheel Size 27.5 Modified rocky mountain thunderbolt medium frame Wheels 27.5 inches 140 rear travel. 150 Pike up front. Converted to electric with a BBSHD, Programed to run without a controller. DOES NOT COME WITH BATTERY Bike is setup to use the battery from a back pack. as you can see the battery Cable runs through the seat post. Comes with back pack and 52 volt charger. Used as a commuter (can go 50KPH, off road only).