3 Racing has modified such a gear as the Version 2 series. In the past, ours used to be the different ratio gear with different diameter. Now we try to unify the diameter into one. Such a gear is the second speed system gear and its diameter would be around 4.4cm.You can change the gear ratio without adjusting the position of the engine mount. It would bring you more convenience.
iz honk-konga v slovenijo v 7 dneh!!! preverjeno!
http://www.3racing.com.hk
