Hi @DaveBowden74 have you looked at the website willtheyfit.com? Using their ‘calculator’ if you go from a 255/40/20 to a 235/50/18, you’ll lose about 20mm in diameter, so you’ll increase your arch gap by about 10mm. I’m sure it’ll depend on your choice of tyre manufacturer too.... they’re bound to vary slightly?
Yeh I,m kind of thinking 245 50s all round should be ok, just hope they don’t rub at 70mm dropHi @DaveBowden74 have you looked at the website willtheyfit.com? Using their ‘calculator’ if you go from a 255/40/20 to a 235/50/18, you’ll lose about 20mm in diameter, so you’ll increase your arch gap by about 10mm. I’m sure it’ll depend on your choice of tyre manufacturer too.... they’re bound to vary slightly?
Last edited: