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Hi All
One little experiment to try is to use a gps and see what the difference is between gps speed and your speedo speed is when your tyres are brand new and then again when your tyres are due for replacement.
Also compare different tyres of the same size on the same rims.
I think you will be amazed at the results.
On my work van I have done this several times as I go through a lot of tyres and the speed differences have ranged from -10 to +10.
Dimi
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