I'm far from an expert, but based on what I've read a roll-out of 48 mm is in the right area for 19-turn.
To work out what pinion size you need, use the following formula:
Pinion size = [required roll-out / (Pi x tyre diameter)] x spur size
So assuming 48 mm of roll-out, a tyre diameter of 51 mm, and an 98-tooth spur gear, you will require a 29-tooth pinion (approximately).
Hope that helps.
Quote:
Originally Posted by LEGEND
So what would be a good rollout for a 19turn motor as mine at the moment is around 48 but i dont know whether that is too high or not. My spur is 98, pinion is 32 and tyre size is 47mm. But if i put a new set of tyres on then the diameter would be 51mm.
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