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Thanks -that's very helpful - I'll still be legal..always good to know. an extra 11mm of diameter shouldn't hurt none. :)

Yes, I think the deeper tread is the key to the increased diameter. The 55 side wall only refers to the wall below the tread I presume. The 235 refers to the width across the tyres ie the width that touches the road? Is this a fixed percentage of the sidewall? I'm getting somewhere here I think :o

Maybe there's a connection there in those two statements -still figuring this forum out! :eek:

Thanks for the welcome Duncp73 - my concern is how to ensure the diameter of advertised tyres - the radius and profile (17 and 55) surely isn't all there is to the diameter - as I say, the road tyres on now are also 17 and 55 but look a lot 'thinner' re diameter (not width). I'll have to ponder...

Hi, I've found some General Grabber all terrain tyres 235/55/17 - they look a lot 'taller' than my current road set. Will they be OK for the Freelander (2006 Td4 station wagon)? How can I find out the diameter of these tyres?