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Thread: Why 225/45 and not 235/45

  1. #1
    Regular Member lee gsi's Avatar
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    Default Why 225/45 and not 235/45

    Just been playing with a tyre size calculator and the 235/45/17 tyre is only 0.62% different to a 215/50/17 tyre.

    But the tyre everyone recommends is the 225/45/17 which is 2.01% different.

    At 70 mph:

    225 tyre will be doing: 68.65 mph
    235 tyre will be doing: 69.62 mph
    Last edited by lee gsi; 26th December 2010 at 21:37.

  2. #2
    Full Member Big Sig's Avatar
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    Because they look odd as they are a bit wide for the rim.
    Now I need a turbo to keep up!

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    235s may be acceptable depending on the distance between each rim (7J, 7.5J etc). I think that the 17 inch rims that Vectra's generally use as standard are only really wide apart enough for 225s. If the tyre is too wide for the rims it will tend to 'roll' too much onto its shoulders during cornering.

  4. #4
    Regular Member lee gsi's Avatar
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    Not sure what width my rims are.
    Its to go on theses wheels:


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    VX only recommend 225 max on standard 17 inch wheels.

  6. #6
    Regular Member lee gsi's Avatar
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    Ah thats a shame.

    Would have been nice to get the extra rubber on the road and have the speedo more accurate

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    Quote Originally Posted by lee gsi View Post
    Ah thats a shame.

    Would have been nice to get the extra rubber on the road and have the speedo more accurate
    TBH I would rather have the speedo reading shown on the 225/45/17s than on the other extreme of 225/45/18s. At least then you definitely know you have a better chance of not being caught speeding.

  8. #8
    Full Member Big Sig's Avatar
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    They will fit as netron had 235's, they just looked a bit silly.

    Also unless you get it correctly calibrated your speedo isn't accurate anyway so its a bit pointless fitting them for that reason.
    Now I need a turbo to keep up!

  9. #9
    Regular Member lee gsi's Avatar
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    Why would you need to get the speedo recalibrated?

    They are closer to the standard size

  10. #10
    Regular Member Celes's Avatar
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    I've seen a Vec with 235's and it looked fine to me

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