Vintage mopeds and dirt bikes as ell as supermotards do not have an automatic transmission, but a manual transmission with sprocket, chainring and chain. You can buy the individual transmission components as spare parts in standard quality. For vintage mopeds we have chains from Iris, coloured chain locks from Doppler and sprockets in different sizes. In the section for Derbi and AM6 mopeds the choice of sprockets and chains is huge; by mounting a sprocket with a different number of teeth the gear ratio can be optimized. Str8 and Doppler also offer coloured sprockets, Stage6 also has coloured chains that can be used for a bit of customizing. 420 and 428 type chains as well as reinforced chains for tuned engines are available in a wide range, and the individual components are also available as inexpensive complete kits.