Technical Tips > Brakes, Suspensions, Steering, Wheels & Tyres

What size tires ?

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Scott:
I use this to calc tyre sizes:
http://www.rimsntires.com/specspro.jsp

I believe you are aiming for a 27 inch tyre height (based on 255/60-15) up to 27.4 inch (225/70-15).

255/45-18 seems on the money.

Jethro:
Yeah Scott great site and that's what I've been using as my Bible...

225/70/15 standard rims I'm currently running with  a O.D of 697
255/45/18 has an O.D of 687

So 697 - 687 = 10mm Difference
10mm O.D  I can live with  :thumb:

In THEORY my new rims having a Back Spacing of  4" which is the same as my 15's  and stick with the same O.D life should be sweet  :nag: :nag: :nag: :nag: however Murphies Law would say not so :nag: :nag: :nag: :nag: Therefore I just need to know if anyone is running the 255's /45 / 18's  on the front without and any issues   :toetapping:

bfit:
mate
 i will check what i have on my 79 and let you know
I think they are 255 60 15
bfit

craigh:

--- Quote from: Jethro on May 06, 2014, 02:55:28 PM ---Yeah Scott great site and that's what I've been using as my Bible...

225/70/15 standard rims I'm currently running with  a O.D of 697
255/45/18 has an O.D of 687

So 697 - 687 = 10mm Difference
10mm O.D  I can live with  :thumb:

In THEORY my new rims having a Back Spacing of  4" which is the same as my 15's  and stick with the same O.D life should be sweet  :nag: :nag: :nag: :nag: however Murphies Law would say not so :nag: :nag: :nag: :nag: Therefore I just need to know if anyone is running the 255's /45 / 18's  on the front without and any issues   :toetapping:




--- End quote ---

I have had the 255's on the front as a test only and I was worried they were too close to guards in turns.

I think later C3's had some changes to the guards to handle wider tyres at full lock

All depends how low U go and how much tramline effect you want.

The wider you go on the front the more tramline you will get.

racingem:
I have 255/45/18 on the front of my 72 and i cannot full lock because they rub. :cheers:

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