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      11-09-2011, 12:56 PM   #13
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Drives: BMW F11 535i Touring
Join Date: Mar 2007
Location: Scotland, Highland Region

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Originally Posted by dakhu1 View Post
Cross ply vs radial debate..sorry guys, not aware of this

Is it being suggested that there are safety issues associated with running a mix of runflats and conventional tyres or purely ride quality issues??
In the 'olden days' so many folks found the ditch, usually backwards, that legislation was brought in to ban mixing cross-plys and radial tyres on the wrong axles. You could only fit radials on the rear, if you had cross-plys on the front, but not the other way around. Definitely not on the same axle, either end.

The tyre experts, tyre makers and safety agencies, clearly state mixing run-flats with conventional tyres, axle to axle, can effect handling and stability. Makes perfect sense, as each tyre type has different build criteria and slip angle characteristics.