what size for ultimate handerling?

[Simon]

Originally Posted by judgie

jsut about all group N,A wrc and the super 1600, s200 run 17 or 18 on tarmac

Thats all because of the braking/brakes. Their cars are heavier than ours so they need bigger/more powerful brakes.

On tarmac they have a lot more grip than on gravel (offcourse).
So on tarmac they basically use the biggest brakes possible (AFAIK up to 380mm diameter!), which needs at least 18" (or 17" for somewhat smaller discs), whilst on gravel they use smaller discs (300-320mm) and matching 15" wheels.

Since (as Humble said) 18" slicks are quiet expensive (especially compared to 15" or 13") for someone like us running lightweight cars on a tight(er) budget it is probably smartest to use wheels and tires up to 15".