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Thread: Another tyre question!

  1. #1
    Regular Member CDTi Mike's Avatar
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    Question Another tyre question!

    Hi Guys,

    I know this has almost certainly been asked before but I can't seem to find it in any of the threads so, sorry for repeating.

    I'm about to replace my two front tyres, and was just wondering if i could put 225/45/17's on the front while leaving the 215/50/17's on the back for a short while until these wear out, since the 225's are cheaper!
    Both are recommended in the manual but was not sure about mixing the sizes.

    Thanks in advance.

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    Regular Member John35's Avatar
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    Not sure about handling etc but legally it is fine as several production cars have different size wheels/tyres on them ie Smart cars, Lamborghini's etc. As long as both tyres are the same on the same axle and fit , not a problem.

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    As above dude.

    It won't throw your speedo out by much either -


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    Regular Member m8internet's Avatar
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    Quote Originally Posted by CDTi Mike View Post
    I'm about to replace my two front tyres, and was just wondering if i could put 225/45/17's on the front while leaving the 215/50/17's on the back for a short while until these wear out, since the 225's are cheaper!
    Both are recommended in the manual but was not sure about mixing the sizes
    When replacing front tyres, swap the rears to the fronts, and that will give you the maximum grip on the rear of the car and a higher average tread depth
    It will also wear the tyres out more evenly, so that you are only replacing two front tyres each and every renewal

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    Regular Member John35's Avatar
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    As a rule you should always have the best tyres on the rear of the car, even front wheel drive. It has very little to do with tread wear. The rear of the car works harder that the front. The front tyres wear out quicker because of the power (and wheel spin) that you put down on the road. All tyres slip slightly when pulling away from a standing start thence the increased wear. They also wear due to the increased braking forces when the weight of the car is thrown forward on all braking.
    Last edited by John35; 28th June 2007 at 19:59.

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    Regular Member VectraV6CDTi's Avatar
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    I've run for the last 5 months with 225/45 17's Toyo Proxies T1-R's on the front and original NCT's on the rear. Not had any problems. Mind you, due to a puncture on one of the rears I've just yesterday had the rear 2 swapped for the same as the front. Big difference in grip . Reason being that Toyos are waaaaay better than NCT5's and now the pofile and width is the same all round. So yes, I think it fine to put 225/45 17's on the front, but if you can afford it, get them on all round. Sooooo much better (and a cheaper tyre too).
    Also, knocked my speedo out by around 2-3 mph (checked with sat nav). So if speedo says i'm doing 40mph, sat nav says about 35mph whereas before it would of said 37/38 mph.

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    Regular Member m8internet's Avatar
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    Quote Originally Posted by John35 View Post
    The front tyres wear out quicker because of the power (and wheel spin) that you put down on the road. All tyres slip slightly when pulling away from a standing start thence the increased wear. They also wear due to the increased braking forces when the weight of the car is thrown forward on all braking.
    Tyre slip is proportional, and under control on moving from a standing start can be almost nil
    Tyre wear is caused more by friction than forces
    Front tyres on a front wheel drive car have more work do to, as they not only have directional forces, but those of the applied power, which doesn't happen with a rear wheel drive car

    Due to the lack of control of rear wheels it is always best to have more grip at the rear, there really isn't any other reason
    It makes no difference whether car is front or rear wheel drive, this will just determine whether any loss of control will result in understeer or oversteer!

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    Regular Member John35's Avatar
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    Numerous tests have shown that it is easier to control the front wheels than those at the rear.

    Front tyres generally wear quicker than those fitted at the rear, particularly on front wheel drive cars, which are currently in the majority.

    New tyres fitted in front :
    - The behavior of the car will change, because the front / rear balance will be reversed.
    The driver, used to a car with less grip at the front, will therefore be taken unawares.
    - On a slippery road, the rear will lose traction before the front of the vehicle.
    The driver will have no chance of controlling the rear, and will be tempted to accelerate further, which will amplify the spin effect. Only an experienced driver will be able to recover from this dangerous situation...


    New tyres fitted at the back :
    - The handling of the vehicle will be similar to that known by the driver before the tyre change, because the traction balance will be the same.
    - Rear traction will be better, and the driver will be able to control and steer their vehicle without a problem by decelerating and turning the steering wheel in the direction of the bend.

    That's why Michelin advises you to reduce the risks you take by fitting new or less worn tyres at the rear of the vehicle for:
    - better grip on bends
    - extra safety.

    Understeer is always better and I think we agree that the new tyres always go on the back axle.

  9. #9
    Regular Member CDTi Mike's Avatar
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    Thanks to all for your replies, looks like i'm gonna have to swap fronts to rear to be on the safe side then replace the (old) fronts later.
    Cheers

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