I use R888s on track, have just bought my second set for the Cossie, and first set for my Mi16 Pug 205.

They are amazing, and on track are just leagues ahead of normal good road tyres.

I also know a man who does very good prices on R888s (or any Toyos for that matter) - PM the size you're after and I'll find out and let you know how much!

Simon