On my car running std koni type struts on front 8jx17s were fine with 205/40/17s. et35. ive run tsw hocks with 215/40/17s there 8x17s et38. ive also run 8x17s on et40 with 205/40/17 all with no issues.. i think you can run bigger tyres if usen coilovers as you have no issue with strut platform catchn