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Thread: tryes ?

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    Default tryes ?

    hi all

    just need the above answered please,am due to put some tyres on but am bit confused , have got 215 * 50* 17 on atm but would i be right in thinking that if i put 235 * 45 * 17 on the car will handle a bit better.

    thanks clembo

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    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

    Trim : LE/VXR

    Engine : 2.0 cdti/1.6 Turbo

    Year : 13/07

    Default

    225 45 r17 is the alternative size recommended by VX, it's in the hand book. 235's would be pushing it

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

    Default

    Quote Originally Posted by clembo38 View Post
    if i put 235 * 45 * 17 on the car will handle a bit better.
    Depends on the make of tyre.

    Also in the wet a wider tyre could actually make the handling worse as you've a larger footprint on the road which could aquaplain far more than a narrow tyre.

    But as said by John, the alternate size for 215/50/17 is 225/45/17.

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    Default

    hi thanks for the reply have been Lizzy of late,have just done the tyre calculator size if i go for 225/45/17 the car will be running 1.9 mph faster than the slandered tyres, but put in 235/45/17 its just 1/2 mph faster so my thinking its better for speedo accuracy,or is that not the case.

    thanks clembo

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    Regular Member m8internet's Avatar
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    Presumably you actually mean a % rather than mph variance

    I posted about this before, changing from 215/50R17 to 225/45R17
    My car now runs faster than the displayed speed, but it is still within the Vehicle Construction Act tolerance of 10%

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    Regular Member john_k_sri's Avatar
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    Vehicle : Vectra

    Trim : SRI NAV XP

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    235's are only recommended by VX for 19" wheels and then only with a 35% side profile - i.e. 235/35/19

    225's with a 45% side profile are recommended for 17" and 18" wheels - i.e 225/45/18 or 225/45/17

    215's with a 50% side profile are recommended for 17" wheels - i.e 215/50/17
    Last edited by john_k_sri; 31st July 2010 at 17:33.

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    Full Member Big Sig's Avatar
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    Default

    Quote Originally Posted by clembo38 View Post
    hi thanks for the reply have been Lizzy of late,have just done the tyre calculator size if i go for 225/45/17 the car will be running 1.9 mph faster than the slandered tyres, but put in 235/45/17 its just 1/2 mph faster so my thinking its better for speedo accuracy,or is that not the case.

    thanks clembo
    That's all ok assumingits correct now, which it's not.

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    Default

    thanks all meant percentage don't know why i put mph. i now under stand.

    thanks clembo

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    I can chip in here as I have just replaced the original fit Goodyear Eagle NCT5 which were 215/50/17 with Michelin Primacy HP 225/45/17.

    Even though they are wider, the lower profile still makes the sidewall smaller, and overall it does make the wheels look a bit smaller but I will get used to that as it's only a bit.

    The speedo can be corrected if you have access to a Vaux-Com programmer. You can program in a different tyre size and the speedo reading will be correct again. Doesn't make a lot of difference though.

    The handling is transformed by the way. These Michelins are great, there is less roll in corners and a lot more grip than the Goodyears. Also I am still getting the comfort I like from my 'old man' elite spec. Nice and quiet too.

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