The Tomos MC50 is a mini 50cc dirt bike. It exists in a few versions, Junior, Senior, and Senior Pro, and like Tomos mopeds it uses kickstart versions of the A35 and A55 engines. However, as it has neither emissions controls nor lights, it is not street legal. It is the only Tomos model to have a rear disc brake (on the Senior and Senior Pro), and at about $700, is the least expensive model of new Tomos.
It is possible to adapt several parts from the MC50 to Tomos mopeds, such as the engine and forks.
A similar bike from Tomos, the MC80, uses a Minarelli 2-stroke engine with a three-speed clutchless manual transmission, unrelated to the A35/A55.