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Thread: changing tyre size - is this legal?

  
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    jamesmurray's Avatar
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    changing tyre size - is this legal?

    the two front tyres on the gsi are pretty worn, and they need replacing. i wanna increase the tyres size, for a bit of extra comfort and grip, so im thinking along the lines of 225/45/17. the rears are standard size at the moment, so im wondering about the legality of running the different sized tyres on different axles? obviousley the rears would be swapped to the fronts, for grip reasons. cheers

    jimbo
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    lee gsi's Avatar
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    You can change them to wha you want but the tread area must stay under the arch and also be the same on each axel (Ie same both on the front or same both on the rear)

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    cheers mate, i jsut checked on the mot testers site and it says same thing. seems to be okay then. funny thing about both axles havign same size of tyre, yet the spare is a 16inch with different wall ratio and tyre width. any1 know if a 17inch alloys will fit in the spare wheel well?

    jimbo
    ASTRA MK4 GSI TURBO
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    NOW CS4 279bhp & 336lb/ft

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    remember the spare should be emergency get you home / or garage .....
    not quite a spare as they used to be.

    17 will fit, but may sit a bit proud

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    yes a 17 does fit in the tyre well but like coo says it sits proud and not flat with the carpet over

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    Enkidu's Avatar
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    If you were going slightly bigger i'd go for the 225 40 17s.... You will find they do come away from the wheel more than the 215 40 17s for extra comfort and grip... You'll also gain a alloy protector as they will slightly overhang the rim

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    you cant get 225/40/17 tyres mate, only 45 profiles. i was considering 235/40/17's as well.

    jimbo
    ASTRA MK4 GSI TURBO
    WAS CS3 268bhp & 282lb/ft
    NOW CS4 279bhp & 336lb/ft

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    Legally you can run any tyres you want as long as they have the legal tread depth! But its advisable to replace 2 at a time on one axle - both fronts or both rears! And both the same size on the axle - unless its somethin like a Cavalier Turbo which needs all 4 tyres the same size and roughly the same tread depth...cuz it messes with the 4x4!

    Stick a set of 225/45/17s on but keep them on the front and the part worn ones on the rear!
    A 16V OO - Lotus Nova 2.0 16v
    A l0W VX - Vectra GSi 2.5 V6
    M700RSA - Astra Coupe SE2 1.8 16v
    WIW6555 - Meriva Design 1.7 CDTi

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    Ah yeah you cant get that size... lol

    BTW you'll have to change fronts and rears for the same or the abs will play up and the esp may have problems due to the different rotational speeds front and rear.

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    sven21's Avatar
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    work in a tyre fitters and i put 225/40/17 dunlops on a car yesterday... who says you cant get that size??!
    2001 'x' 1.8 16v sri 3dr
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    www.sundaycruise.co.uk

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