The spare is only on for a very short while whereas the alloy wheel can be on for years and subject to much more stress.rogerhume said:What about when you put on the steel spare wheel?Surely you don't have to change the nuts????
As the sidewall is wider the 'feel' of the slip between the road and the wheel rim would be different. The ASB would be calibrated for a range of normal wheel which could be fitted without re-calibration ie. calibrated to a mid point. If you go outside the range then calibration would be required. My opinion only, not verified.darkclothdave said:BUT
I have it on good authority that the 15" wheel with winter tyre on is the same diamiter as 16" with standard tyre on. Taller side wall on smaller rims.
So no need to change the abs system.
the rims are £59
tyre from £65 - 120