Flying Horse 2-Stroke/4-Stroke Motorized Bicycle Engine 2.5L Gas Tank &ndash; Gas Bike Tank Upgrade (2.5L Black) The Black 2.5 L Gas Tank is made for 2-stroke and 4-stroke gasoline powered motorized bicycles across the board- any size, any displacement This tank fits on standard bicycle frames of 1-1/2 in diameter. With upgraded tank mounts and slight modification you can fit this tank on an oval-shaped tube or frames with tubes up to 1-3/4 Mounting and installation is simple: unbolt the brackets from the tank, set the tank on the frame, fit the mounting brackets to the mounting studs, and bolt. Install your fuel valve and fuel line to your engines carburetor and fill with gas Gloss Black finish; holds up to 2.5 L of fuel (1/2 gal)