Tamiya don't make a big range of pinions for this car- other manufacturers do make pinions that fit and are in a wider range of sizes. I know what you mean with the short motor shaft - personally I've not had a problem with running standard pinions on most of my motors, though they are close to the edge.
__________________
If your PM doesn't at first succeed - try, try again. I'll reply in the end, honest. 
|