Originally Posted by
kovmps6
on here... best to go 225/40 over 225/45 on a stock 7.5 mps rim?
Stock MPS rim is 7", not 7.5"
Following tyre manufacturer specifications strictly means that 225/45R18 is a better fitment than 225/40 to the stock 7" rims.
Most tyre manufacturers do not warrant 225/40R18 on 18x7 rims. There are a small number who do. Not all of their tyre models will - it's something to check on the specifications of each tyre.
On the other hand, I'm yet to see a 225/45R18 that isn't OK according to the tyre manufacturer to fit to the 7" stock rims. Hence I'd reccommend them.
Again - opinions will vary, and many people allow some leeway against the specs. 225/40R18 on the stockers is commonly fitted, but warning as above. Another example is 235/40R18 on 18x7.5". Most are not warranted on 7.5" rims, but a few are.
So - in summary - before the deluge of opinion in favour of 225/40R18 on stock rims and ignoring manufacturer specs arrives:
225/45R18 is a better fitment because 225/40R18 is not usually warrantable.
It is not usually warrantable because the fitment is usually outside the tyre manufacturers specifications.
Last edited by Nexus; 28-01-2011 at 09:32 PM.
"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.