[DaddyA]

Cheers for the replies,

I was worried about the size of the alloys, however, there was a table that compared various tyre sizes and that seemed to indicate that the actual size was basically the same as the original sierra wheels (obviously not width) and standing them side by side it seems to be correct.

I'm not far off putting the rear arches on so I'll soon find out. The arches are resting over the rear wheel now and all seems ok at the mo!

Just to clarify - Alloys 205/40/17, original sierra 185/65/14 came out near as damn it the same - just checked. Got my alloy tyres size wrong by 5.