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Thread: Tyre sizes for a 17x7 wheel...

  
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    Tyre sizes for a 17x7 wheel...

    Hello, I have searched, but come up with a lot of different information, none of which really answered my questions.

    1) what size would you recommend for a 17x7 wheel ? (for a Mk4 Astra)

    2) what are the pro's/con's of using the different sizes?

    3) which sizes work out cheaper, or are they roughly the same?

    Thanks,
    Tim
    0-60 in 6.5 secs and 48mpg- winner!

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    VX fit 215/40/17's to standard 17" rims

    I've got 215/45/17's on mine tho

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    Are your 'standard' Vx rims 7J or 7.5J though??

    What is the reason for having a bigger sidewall??
    0-60 in 6.5 secs and 48mpg- winner!

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    Both size tyres are perfectly fine on on both rim widths, so that's noy really an issue in a decision.

    The reasons I went up a profile are many

    40's on 17's look piddly in the arches of a MK4 IMO
    Increased comfort, especially on hard suspension, and crap roads
    My 5 spokes have large sections that are unsupported by a spoke and were prone to bucking on 40's - 45's seem to have cured that.
    Fitting 17's and 40's made the speedo read woefully over (>10%) - 45's cured that and now it's >5%
    Slightly better fuel ecomony (they turn less per mile)


    They were cheaper too at the time of fitting

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    excellent, that's exactly what I wanted to know

    Thanks Geoff.
    0-60 in 6.5 secs and 48mpg- winner!

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    I've got same problem, currently on 205x40x17 on 7x 17 ET 38 rims with standard SXI suspension. Kirbing all the time, hard on portholes etc. Everyone says 215x40x17 but would rather have 215x45x17. Anybody see any problems?

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    A pleasure Tim, and an appropriate piccy whore time...on 45's...


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    im very scheptical about the whole speedo change thing? Ive just gone from 16/205/50 to 17/225/45 its weird how your 5 profile made a difference.

    when standing my different wheels next to each other theres a huge difference in circumference and there is absolutely bugger all difference in the car. through speed cameras, gps, road angel or those boards that tell you your speed.
    323 BHP / 312 lbft.......

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    Why be sceptical? - it's only physics

    For a given rotational speed, a larger wheel will travel further per rotation, so it will cover a fixed distance faster.

    BTW my speed was checked, before and after, with one of these wee buggers



    That's a Trimble GeoXH - industrial GPS with sub-30cm positional accuracy - not one of those Tom Tom (etc) jobbies that have about 10m positional accuracy if your lucky

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    im not having a go, i know where your coming from. I just find it weird,

    I was actually quite worried about it making a huge difference. I think the car feels slower accelerating, which obviously follows the theory as the power would be geared differently.

    But this is too much detail and way off topic now anyway...

    wheels look spot on ffeog and cars very shiney
    323 BHP / 312 lbft.......

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