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Thread: 18's - What tyre size? Offset?

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    Regular Member aaruck's Avatar
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    Default 18's - What tyre size? Offset?

    Cheers!

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    Regular Member Gsi3.2's Avatar
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    tyre size is 225/45 ZR18...

    ET 33 on my Irmy Stila's... ET41 on the wife's Irmy Signa's..

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    Regular Member aaruck's Avatar
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    When I select wheels for a 2002 + Vectra on Rochford tyres website I only get offered 225/40 or 225/35. Are we sure 45 is the profile?

    Cheers

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    [Ex]Admin Duncan's Avatar
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    I'm pretty sure you don't want 225/35. I've got 225/40 (which I like) but they came off an Astra. For the Vectra C / Signum though the one listed in the manual is 225/45

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    Or if its a 8" wheel 235/40,just to confuse things.

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    Regular Member aaruck's Avatar
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    Duncan, Is your speedo out at all? (assuming you have a GPS to compare to)

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    [Ex]Admin Duncan's Avatar
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    It over reads by a few mph (you'll find all speedos will over read a bit). So when I'm showing say 70 on the speedo, it'll be around 66 on GPS. When I was on the standard 17s it would over read by a 2-3mph, so it's only changed by about 1mph on the 18s.

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    Regular Member aaruck's Avatar
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    Fair enough, Mine is over by about 2-3mph on the 17s.

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