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 Gas Frame 2.4L Requirement on seatpost:27.2mm, Note: buyers need know how to fasten the motor on the pedestal mount of gas frame to prevent crack from vibration which maybe caused crack of frame; Bicycle gas frame Built-in 2.4L gas tank Designed for the 2-cycle engines 48cc/66cc/80cc with 40 to 50mm wide front mount stud spacingBottom bracket: 51.5mm (inner diameter)&60mm (outer diameter)Required for seat post:27.2mm Required for seat post clamp:31.8mmtriple tree suspension fork is compatible with our gas tank frames.26" front fork: suspension with double shoulder;Disc brake bracket and U caliper bracket;compatible with 26"*2.325 inch tire maxHeadset requirement is 1 1/8'' and works well with the fork Outside Diameter of Up Tube:2.89cm/1.138inch and 38.1mm/1.5 inch for lower leg, Suspension forks does not work well with Bicycle handle bar which fits well on out leg diameter 3.15cm to 3.18cm(1.24inch to 1.25inch) of triple tree fork One Piece Crank 2'' Cup Wide Pedal Crank Kit, Length of Arm:152mm/5.98 inch,compatible with 1/2 inch pedals; The distance between the pedal crank arms is about 185mm/7.283inch