I'd imagine it's Z, the highest one, which I think is up to about 170/180mph. (Or do W and Y fall into this category also?) Or I could be completely wrong
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Speed Rating?
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strangely both W & Y are higher rated than Z
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Am i right that the st comes from ford with continental sport contact 2's fitted? if so i am ok with a W rated tyre cos the contis are Z
Am i right that the st comes from ford with continental sport contact 2's fitted? if so i am ok with a W rated tyre cos the contis are Z
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Bit odd that! Yup it comes with Conti Sport Contact 2's as standard
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thank you
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Everyday's a school day
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mine are ZR rated, and these are the goodyear excellence supplied on the car when new, that means 149mph 
QUOTE(davo1983 @ 18 Dec 2009, 02:41 PM) <{POST_SNAPBACK}>mine are ZR rated, and these are the goodyear excellence supplied on the car when new, that means 149mph
It becomes a bit more complicated for 'ZR' rated tyres.
The 'ZR' denotes the tyres are rated to at least 149mph and possibly more. There is usually another letter after the load index that gives the specific rating, but this is not always stated ion the tyre. Some tyres you will need to look up the specific speed rating, all you will know by looking at tyre is that it is capable of speeds of 149 and above.
example: 225/40 ZR18 92Y
The 'ZR' denotes they are capable of 149mph and possibly above.
The 'Y' after the load denotes they are tested to speeds of 186mph.
It becomes a bit more complicated for 'ZR' rated tyres.
The 'ZR' denotes the tyres are rated to at least 149mph and possibly more. There is usually another letter after the load index that gives the specific rating, but this is not always stated ion the tyre. Some tyres you will need to look up the specific speed rating, all you will know by looking at tyre is that it is capable of speeds of 149 and above.
example: 225/40 ZR18 92Y
The 'ZR' denotes they are capable of 149mph and possibly above.
The 'Y' after the load denotes they are tested to speeds of 186mph.
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