heres a good click and paste article... note the bit about the spare...
"
Designing a tyre tread which will operate equally well rotating in either direction inevitably involves compromises which limit ultimate performance in some respects.
Directional tyres, on the other hand, are designed to rotate in one direction only (indicated by a conspicuous arrow pointing in the direction of rotation on the sidewall along with the word "rotation"); so performance - wet grip, directional stability and handling - far from being compromised, is optimised.
Obviously, a directional tyre can deliver this improved performance only if it is correctly fitted to ensure that it rotates in the direction indicated on the sidewall.
What happens if you are unfortunate enough to have a puncture and your spare wheel is fitted with a directional tyre designed to rotate in the opposite direction to the tyre which it replaces? You are recommended to treat the spare wheel as a 'Temporary spare', drive at reduced speed and have the tyre correctly refitted as soon as possible.
(Reproduced by kind permission of the BRMA)"
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Topic: Tyres
