CDHPOWER Gas Frame 3.4L Requirement on seatpost:27.2mm; Black bicycle gas frame Built-in 3.4L gas tank Designed for the 2-cycle engines 48cc/66cc/80cc
Rear Disc brake bracket; rear width:135mm; Requirement on switch of gas frame: 10*1.5mm
Frame made especially heavy duty for gas engine applications Available with 135mm rear frame width for either single speed or multi-speed bikes.
Bottom bracket 1.732" /44mm diameter;Requirement on seatpost:27.2mm; the width and Inner Diameter(including depth of screw) of the bottom bracket:68mmx35.4mm/2.677inx1.3937in
PLEASE NOTE 1: the best safe speed if racing: 35km/h; Head tube: 150mm; requirement on headset size:1 1/8";