About this item Rear Disc brake bracket and front mount pedestal works well with gas motor front mount bolts 8mm rear width:135mm; the width and Inner Diameter of the bottom bracket:68mmx50.8mm/2.677inx2in Frame made especially heavy duty for gas engine applications Available with 135mm rear frame width for either single speed or multi-speed bikes. 38mm diameter downtube 70 degrees angle V frame Include 26″ front fork: suspension with double shoulder, compatible with our gas tank frames Include Headset is 1 1/8” and works well with the fork and frame PLEASE NOTE 1: the best safe speed if racing: 35km/h Head tube: 150mm; bottom bracket 2″ diameter. Any questions,please contact us firstly!