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Thread: Tyre sizes ?

  1. #1
    Regular Member MAF 3.2 V6 GSi's Avatar
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    Default Tyre sizes ?

    Is it ok to run 225/35/18 tyres on 18 inch alloys on a Vectra C

    Thanks in advance

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    It will throw your speedo out mate. Give me a sec and I'll tell you how much.

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    Basically with the 35 profile fitted your wheel will be spinning at 3.6% too fast. Meaning when your speedo reads 60mph, you're actually travelling at 57.8mph.

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    Full Member Big Sig's Avatar
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    6.8% too fast so the speedo will show 60 your actually doing 55.9

    Based on the correct size for 18's being 225/45/18 (not 225/40/18)

    http://www.miata.net/garage/tirecalc.html
    Now I need a turbo to keep up!

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    Regular Member MAF 3.2 V6 GSi's Avatar
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    Is the best tyre size 235/40/18 ???

  6. #6
    Regular Member MAF 3.2 V6 GSi's Avatar
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    Quote Originally Posted by Big Sig View Post
    6.8% too fast so the speedo will show 60 your actually doing 55.9

    Based on the correct size for 18's being 225/45/18 (not 225/40/18)

    http://www.miata.net/garage/tirecalc.html
    Apart from that, Any other problems ?

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    Quote Originally Posted by MAF 3.2 V6 GSi View Post
    Is the best tyre size 235/40/18 ???

    Yes.

  8. #8
    Full Member Big Sig's Avatar
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    Quote Originally Posted by MAF 3.2 V6 GSi View Post
    Is the best tyre size 235/40/18 ???
    Thats the closest to the 215/50/17 that most came out of the factory with and help to protect the rims better. I have run that size and a few do and they are perfect imo.


    Quote Originally Posted by MAF 3.2 V6 GSi View Post
    Apart from that, Any other problems ?
    Probably a harsh ride.
    Now I need a turbo to keep up!

  9. #9
    Ex-Staff Full Member John LE's Avatar
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    Trim : LE/VXR

    Engine : 2.0 cdti/1.6 Turbo

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    Quote Originally Posted by MAF 3.2 V6 GSi View Post
    Is the best tyre size 235/40/18 ???
    Thats the correct size for the VXR iirc

  10. #10
    Regular Member MAF 3.2 V6 GSi's Avatar
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    Cheers people

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