We're testing a ball diff which hopefully should be out soon for those that want it. Seems to be a bit better on some of the more slippery indoor surfaces but for outdoors I don't think it'll make much difference if any.
I measured a variety of ball diffs and nothing else is a direct fit. The 22 diff is closest and does go in but the overall diameter of the gear is about 0.5mm larger so it does make the gearbox tighter, and it will need shimming too - not ideal but it can work if you're desperate....
|