Made to motorize GT-1 (no gas tank) and GT-2 (gas tank) bicycles are specially designed to accept our 2 or 4 stroke bicycle engine kits with minimal effort. These zipper fit bicycles were designed to have a engine kit installed in about 30 - 60 minutes. Front suspension, heavy duty axle with drum brake , double wall rims, and a mid frame kick stand are just a few of the standard features on these ready to go bicycles.