Originally Posted by
6_MPS
I have to agree with you!!!
---------- Post added at 09:03 PM ---------- Previous post was at 08:57 PM ----------
While on the subject two salesmen have pointed out that I could use 235 40 18 on the stock rims...?
Has anyone used this size? I'm a little uncomfortable but if it was ok to use, there's a larger range to chose from and better value as well!
Check the tyre's specifications. The manufacturers publish the minimum rim width to suit. The only 235/40 that can fit to a 7.5" rim that I've seen is Federal SS595, and even then variations such as SS595EVO require an 8" rim. You might be able to fit them to 7.5", but they are NOT WARRANTABLE - i.e. the manufacturer would not honor warranty on the tyre if they knew it was fitted so, and in that case, whether you are roadworthy is debatable.
Tyre shops will not always give you good data on this. Check the specs yourself, and you can't go wrong. 235/40 on 18x7.5" is generally not warrantable with only a small number of exceptions. 235/40 on 18x7" would just be silly. You might be able to, but you're stressing the tyre in ways it wasn't made to be stressed.
"Blue Meanie" 2007 Aurora Blue MPS 3 - 18x8.5+44 SSR GTX01 - 235/40R18 Michelin PS5 - 3.5" ETS TMIC - CPE stg 2 mount - HKS/CPE BPV - 2XS inlet - 2XS short shift - Corksport turbo manifold - HT 98 octane tune - Leather/Aluminium handbrake - Momo shifty knob - 7" touchscreen - JDM Mazda Retractable dashtop screen assembly - Bespoke Raspberry Pi Android based GPS/Carplay and instrumentation - 36AH reserve battery and C-TEK isolator - TEIN Street Advanced coilovers 1" drop - Superpro bushings - 220Kw/410Nm.
"Lipstick" 2013 Velocity Red MPS 3 - 18x7.5+48 Enkei RPF1 -225/40R18 Federal RS-RR - CPE TMIC - COBB inlet - CPE stg 2 mount - COBB Stage 1 98 octane tune - COBB shifty knob - 2XS short shift - 2XS turbo manifold.