Originally Posted by
marcos graveyar
The Ra uprights have a different kingpin offset so you can adjust track/steering width.
The narrowest track is if you use Ra upright with standard C hub, Standard is using Ra upright with Ra C hub or Standard upright with Standard C hub. and the widest track is Standard Upright with Ra C hub.
Narrowest to widest is nearly 5mm difference in track.
Remember that any change in track will require re-adjustment in toe out.
Great info thank you. Thought it had to do with caster. But I can play with track width now, I like my cars to aggressively rotate into the corners. Hope it's legal at Tamiya USA. Because it looks like the M05v2 setup sheet has this as an option.