[chrisguyw]

Well I've gone from 10:30 to 10:36 but I've had to go up a tyre size to get the teeth off the track and there's no way to test it until I can get back to the club's big straights - next Spring! Maybe I'll check to see if I have a 9 or 8 tooth pinion in the meantime?

Going from a 3:1 ratio (10 x30) to a 3.6:1 ratio will certainly improve both acceleration and braking (at the expense of a bit of top end), but, having to use taller tyres does reduce the numeric ratio, depending on how much taller you had to go with the tyres, so you may well end up where you started,......additionally a taller tyre will raise the center of gravity, and this may well adversely affect handling/lap times

Reducing the tooth count on the pinion, is a much better idea all round.

You can also certainly play around with different dia. pinions and Spurs

Cheers
Chris Walker