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Thread: 215/40/18 vs 225/40/18

  1. #21

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    saves me making another thread il ask my questions on here... best to go 225/40 over 225/45 on a stock 7.5 mps rim?

    aslo what do people think is the best value for money tyre from the below :

    New 225-40-18 PIRELLI PZERO NERO $185 each

    New 225-40-18 PIRELLI PZERO NERO TYRES AUDI BMW VW MERC (eBay item 230579165768 end time 07-Feb-11 17:28:34 AEDST) : Cars, Bikes, Boats

    4 X 225/40/18 KUMHO KU31 TYRES $200 each

    4 X 225/40/18 KUMHO KU31 TYRES WRX GOLF ACCORD MAZDA6 (eBay item 280571221658 end time 02-Feb-11 21:29:44 AEDST) : Cars, Bikes, Boats

    or Yokohama Avid S34 225/45/18 $200 each

    Mazda RX8 Nissan 350Z Tyres 225/45/18 4 New Tyres (eBay item 310291404067 end time 06-Feb-11 16:09:52 AEDST) : Cars, Bikes, Boats

    read a heap of other threads and ku31's are a goer... just wondering if anyone recommends the pirellis or those yokohamas before i start searching for a best price on the ku31's?
    2005 Mazda MPS6 Radiant Ebony Luxury-Pack

  2. #22
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    Quote Originally Posted by kovmps6 View Post
    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.

  3. #23

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    Quote Originally Posted by Nexus View Post
    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.
    i brought another set of mps6 wheels yesterday and the zigen boxes they come in had 18x7.5 written on them and thats why i got confused and forgot the stock ones are a 7 inch..

    thanks for the feedback il investigate further with the tyre company i buy off.. wonder if there is issue with insurance..
    2005 Mazda MPS6 Radiant Ebony Luxury-Pack

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