Quote:
Originally Posted by Martijn
I have a gearing of 22/81,( and drove on grass).
I always used this gearing when I drive on our dirt track.
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Which motor wind?
If you use clay tyres on the clay and Schumachers on the grass you should alter the gearing due to the different tyres diameter
So if you take your gear/spur and the tyres as and I'm guessing here on tyre size
Schumacher = 80mm dia = rollout of 26.26mmpr
Clay Tyre = 90mm dis = rollout of 29.54mmpr
So you would need a 25t pinion (29.84mmpr) to get close to the clay tyre rollout, but allowing for the drag of the grass use a 24.
MMPR = Tyre diameter (mm) x PI (3.14) / Number of Spur Teeth x Number of Pinion Teeth / Drive Ratio
if my maths is wrong and the B4.1 internal ratio wrong shoot me down