I have a spare set of staggered 17" alloys and want to fit 225/45/17 winter tyres. I believe I can fit these onto the rear 8.5J rims but is anyone able to clarify this?
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Yes you can fit 225/45 17 tyres on 8.5j rims without problems. I've run with that set up on winter tyres for 9 months and probably 5,000 miles.
The tyre will appear a little more stretched than the standard fit 245/40 17 tyres. I've just switched to 7.5j rears on my winter set-up for this reason.