Dan,
Lazer wheels will fit (Lazer ZX-R anyhow, don't know if the most recent lazer wheels will fit).
You can find out the gearbox ratio very simply actually (using a similiar method to rollout on 12th/Foam Tyres).
Mark a point on the spur gear at the top, and on the top of the rear wheel. Have a mate (or your dad) watch the rear wheel, and roll the car forward, until the rear wheel has completed 1 turn, while at the same time, watching the spur gear to see how many rotations their are compared to 1 turn of the rear wheel. It is very rough guide, but from memory it should be around 2.4 or something similiar. The gearbox ratio should be between 2 and 3 to 1 anyway, so if its not, then you have done something wrong.
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