I had Kleber Dynaxer tyres fitted to the front of my Corsa but I noticed that one was an HP2 and the other was an HP3.

Question from gerrymo, 09/07/2010 :I had Kleber Dynaxer tyres fitted to the front of my Corsa but I noticed that one was an HP2 and the other was an HP3. What is the difference and are they compatible or should I complain?
Answer by rezulteo, 09/07/2010 :

The British legislation approves this tyre-fitting type only if both tyres have the same characteristics.

rezulteo's advice: Maintain the homogeneity on each axle in order to achieve a symmetrical driving sensation. The safety is not affected when one axle has a heterogeneous fitting, however stay heedful when your car indicates that it pulls in freewheel,and has an elevated mileage in kilometres.If this is the case, it is recommended to displace your front tyres to the back and fit homogeneous tyres to the front.

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Answer by John-PureTyre, 09/07/2010 :

I see you posted this a month ago, so you may all ready have the answer.
Firstly its odd that a tyre supplier wouldn't fit a matching pair of either HP2's or HP3's instead of putting two odd tyres in the same transition, if this is the case I would contact them as this may have been done in error especially if you were not informed that this was going to be done and you didn't give prior consent.
The HP2 is the old symmetrical tread pattern and has now been superseded (updated) to the asymmetrical HP3 pattern. The tyres are compatible although its strongly recommended to be fitted in axle sets but in some cases (E.G if you got a puncture) where only one tyre is required you could fit the next most compatible tyre. If you do this normally it better to have the odd tyres on the rear of the vehicle as different tread patterns can affect the way the vehicle steers. There is a obvious exception to that rule like if the tyres were different size front then on the rear.
N.B: Asymmetrical (non symmetrical) are the latest innovation in tyre design it's said that Asymmetrical reduce road noise, increase handling etc
Kind regards
John
www.puretyre.co.uk