i think im having a dumb day today, but here is the jist of it.

 

My car failed the mot due to camber problems and i needed 4 tyres to get through the mot.

 

i bought a set of 225's to go all the way round on 17" rims. the fronts were spot on, the rears are far, far too small so am looking at purchasing some proper tyres for the size rims that I have

 

now on mytyres.co.uk I purchased the following for the front

Kumho

Summer tyres ECSTA SPT KU31

225/45 R17 94Y XL BSW

 

now iirc, the Y is for the speed rating, correct?

 

I wanted to purchase the same tyres for the rear, and found the following.

Kumho

Summer tyres ECSTA SPT KU31

255/45 R17 98W

 

According to that, the rears have a lower speed rating

(front = Y = 186Mph)

(rear = W = 168Mph)

 

 

Now, I know you cant have say speed rating Y on front nearside and W on the front farside - but it there any legality of different speed ratings on the front as opposed to the rear?

only thought the tread and rotation was an issue never heard of mixed speed ratings being a fail ?....sizes need to be suitable for the rims of course...i.e. uk zeds have different rear size

i was under the impression it was illegal - i thought you could have diff speed ratings front and back, but not each side. suitable size cant be a huge issue as i squeezed a pair of 225s onto 9.5j tyres to get through the mot.

 

I have a jap spec zed, but with aftermarket wheels on 8j 17 on the front, and 9.5j 17 on the rear,

no, its fine to mix speed ratings, just not different sizes on the same axle. only reason for rejection for speed ratings is a rating of between A-K :)

thanks Paul :)