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Thread: Tyre size?

  1. #1
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    Default Tyre size?

    Got 215/50 r17's on my Signum Design at the moment, I've seen mentions of using 225/45 r17's instead. what's the advantages? Is the profile visibly different when on the car?

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    Regular Member Graham's Avatar
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    They are cheaper , but the down side is you get a slightly larger gap between the tyre and wheel arch.

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    Vehicle : Vauxhall Astra-J

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    Quote Originally Posted by Graham View Post
    the down side is you get a slightly larger gap between the tyre and wheel arch.
    I'm a 225/45/17 convert and its never bothered me.

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    Regular Member lee gsi's Avatar
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    Never even noticed it as there is so little difference.

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    A lot cheaper than the standard size but very noticable IMO. The rolling diameter is half inch less!

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    Chaps, I've been seeing this bigger size quoted on the forum as being Ok as a straight swap but I don't see how it can be as it's a half inch different in diamater and knocks your speedo out by almost 2%. I'd always thought you needed to keep it under 1% really? 235/45/17 is a closer match but a strange size and not common.


    I can see why people do it tho, looking at some prices on the net I found:

    Contisport 3:
    215/50/17 is 140 quid
    225/45/17 is 111 quid
    235/45/17: 130 quid

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    Regular Member chewy71's Avatar
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    Rolling RADIUS of 215/50/17 is 314mm
    Rolling RADUIS of 225/45/17 is 308mm

    so overall diameter of the 225/45/17 is 12mm less

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    Quote Originally Posted by chewy71 View Post
    The rolling diameter is half inch less!
    WOW! That much?

    If it were my dick, then I might be bothered, but for lump of rubber on each corner of the car, I couldn't be fussed one way or the other.

    Don't forget your brand new tyres start off with having approx 8mm of tread on them, and 6 mm less when they're worn to their legal limit. That means your 215 sized tyres are nearly ½ inch smaller as well when they're worn.
    However do you sleep at night with all that worry

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    Regular Member chewy71's Avatar
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    Quote Originally Posted by Big Dave View Post
    WOW! That much?

    If it were my dick, then I might be bothered, but for lump of rubber on each corner of the car, I couldn't be fussed one way or the other.

    Don't forget your brand new tyres start off with having approx 8mm of tread on them, and 6 mm less when they're worn to their legal limit. That means your 215 sized tyres are nearly ½ inch smaller as well when they're worn.
    However do you sleep at night with all that worry
    which means the 225 will be an inch less when they're worn. Horses for courses Big Dave. My posts is a simple response to the OP question. Yours is simply baiting an argument. Grow up.

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    I just shoved 225/50/17 on the rear and 215/50/17 on the front of my vec and its sweet. Can't see how the diameter of them will make any difference even if they were half the diameter (if you only do the rears) of the original as I thought the speedo was calibrated to the front wheels, but could be wrong. Anyway they look great and fit well. I was mainly concerned about "tram-lining" issues but its feels the same.

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