You need to use Schumacher tyres, in no other than YELLOW compound.
The most popular tread pattern is mini spike - so you would need:
1 pair 2WD front Schumacher Mini Spike Yellows
1 pair Rear (4WD and 2WD are the same rears) Schumacher mini spike yellows.
There have been a couple of 2WD cars lately, but there is a danger of becoming frustrated at the lack of performance, as the hall is very slippery. Howver, there are plans to lay a lot more carpet down.
We do have a club car you can use if you would like to try for a race or two.
As for a pinion, run a 19 or 20 tooth 48dp pinion on the 4.5 in a B4 with 81T spur.
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