3.4L Felt Faker Gas Frame (135mm Rear Width) 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.