RE: rusty 2.5 gearing
id like to know the same question...
today i tried to swap out the 70t spur with the 72t that came with the RTR kit and it mashed with the clutch bell and didnt allow it to turn without alot of force. i immediately took it off. (man, those little red pegs suck...)
i think the stock clutch bell is a 20t, so which spur can i run with it?
...oh yea im not sure on terminology is correct heh...