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Thread: 285/50/20 instead of 285/45/20 on Q7 S-line with Air Suspension

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  1. 285/50/20 instead of 285/45/20 on Q7 S-line with Air Suspension 
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    Hi,

    are there any issues with using 285/50/20 tyres instead of 285/45/20 (that size was installed when the car was new) on a Q7 2017 with air suspension apart from some issues with speedo/mileage counter, etc? An Audi dealer just done that, they have replaced a decent but worn out Goodyear tyres with a budget version from Altenzo calling it a future (more comfortable ride due to extra rubber).
     
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  2. Re: 285/50/20 instead of 285/45/20 on Q7 S-line with Air Suspension 
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    I wouldn't be happy with that. I reckon that's nearly 4% difference in tyre diameter, when 2-3% is the usual recommended maximum (preferably closer to the 2%...). Could upset the ESP type things in normal driving or when you really need it. I also wouldn't want a brand or even tread on there that I hadn't agreed to. And I wouldn't want it fitted unless within ~£20 all in of what my preferred fitter would do it for.
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  3. Re: 285/50/20 instead of 285/45/20 on Q7 S-line with Air Suspension 
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    Quote Originally Posted by RobertJB View Post
    Hi,

    are there any issues with using 285/50/20 tyres instead of 285/45/20 (that size was installed when the car was new) on a Q7 2017 with air suspension apart from some issues with speedo/mileage counter, etc? An Audi dealer just done that, they have replaced a decent but worn out Goodyear tyres with a budget version from Altenzo calling it a future (more comfortable ride due to extra rubber).
    285/45/20 could be replaced by 255/50/20 but the rims should be more narrow.
    I would not experiment with not standard tyres. Our cars are loaded with sensitive electronics and any deviation from the factory recommendations can fool these systems.
     
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  4. Re: 285/50/20 instead of 285/45/20 on Q7 S-line with Air Suspension 
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    Thank you for your feedback.

    Personally, I would not do it myself, so it is ever more puzzling why an offical Audi dealer already done it and is selling this "upgrade" as a feature.
     
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  5. Re: 285/50/20 instead of 285/45/20 on Q7 S-line with Air Suspension 
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    255/50R20 makes a lot more sense in terms of wheel diameter - is that what you meant? Not good on a 10J / 10.5J rim if that is what you have though.
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  6. Re: 285/50/20 instead of 285/45/20 on Q7 S-line with Air Suspension 
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    Quote Originally Posted by VAG-Abound View Post
    255/50R20 makes a lot more sense in terms of wheel diameter - is that what you meant? Not good on a 10J / 10.5J rim if that is what you have though.
    255/50/20 should be on 8J rims. This combination is delivered originally by Audi as winter wheels.
     
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  7. Re: 285/50/20 instead of 285/45/20 on Q7 S-line with Air Suspension 
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    The dealer has not changed the rims (9J), so effectively they have removed 285/45/20 (Goodyear F1s) and installed on the same rims 285/50/20 (Altenzo Sport Navigator). The issue is with going from 45 to 50 which is out of spec.
     
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