Motoring Discussion > Volvo S40 - Uneven tyre wear - centre of tread? Miscellaneous
Thread Author: Auntie Lockbrakes Replies: 4
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New Sun 23 May 10 02:13 
 Volvo S40 - Uneven tyre wear - centre of tread? - Auntie Lockbrakes
What causes the centre part of the tyre's tread to wear excessively (as opposed to the inner or outer edges)? My Old Man's just spotted this during the MOT. They are pricey 17-inch Michelins. They were not low on pressure, if anything over-pressurised. But if they were over-pressurised, wouldn't this cause the outer edges to wear out more quickly, not the centre? Any insight appreciated!
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New Sun 23 May 10 02:40 
 Volvo S40 - Uneven tyre wear - centre of tread? - Lygonos
Overinflation would do exactly what you have found.

www.driverstechnology.co.uk/Tyre-Pressure.htm
Last edited by: Lygonos on Sun 23 May 10 at 02:41
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New Sun 23 May 10 07:22 
 Volvo S40 - Uneven tyre wear - centre of tread? - L'escargot
The higher the pressure the more the tread becomes rounded instead of flat and therefore the outer edges of the tread are no longer in contact with the road (except possibly when cornering) and the centre of the tread wears the most.
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New Sun 23 May 10 09:18 
 Volvo S40 - Uneven tyre wear - centre of tread? - Stuu
Overinflation it is.
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New Sun 23 May 10 09:26 
 Volvo S40 - Uneven tyre wear - centre of tread? - Auntie Lockbrakes
Thanks for clearing this up guys. The Old Fella was led to believe that UNDER-inflation had caused the wear, which confused me a bit. Wonder which bright spark did the MOT for him and told him that...?!
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