*confused* prodrive GT1 alloy, what size tyre???
 

prodrive says..http://www.prodrive.com/products_lev...86&p=12&i=1030

The 8.5" wheel allows the fitment of a wider low profile 235/40 R18 tyre to the STi


pro-r says..http://pro-r.co.uk/products?filter%5Bcat%5D%5B%5D=5

8.5"x18" offset 53 Tyre Size: 225/40/R18 STI 05-11MY


so 225 or 235??

whats fitted to the RB320??

Either will be fine :thumb:

The 225`s will be a bit cheaper than the 235`s, Possibly a lot depending on the make.