We always want our bikes to perform the best that they can. This means that the smallest details and facets of our bikes will inevitably receive upgrades, and naturally, axles fall under this category. And if you"re an advocate of Stan"s No Tubes, you"ll be happy to know that it"s introduced a 12x142 Conversion for your ZTR 3. 30 or 3. 30Ti Rear Hubs. Now, you can send trails like your downhill counterparts while still maintaining your climbing ability. The Stan"s No Tubes 12x142 Conversion kit for ZTR 3. 30 and 3. 30Ti Rear Hubs comes with an axle and two end caps. Please go to Stan"s No Tubes official site for information on installing your conversion axle.