I want to remove the spare alloy in order to reduce weight but I don't want the risk of no spare. What size steelie would fit over the calipers of the 172?
Anyone any ideas what car I could get one from?
Let me get this straight, you're going to replace your alloy spare wheel with a steel one to save weight?
Changing to the same size steel wheel isn't going to save any weight. And changing to a smaller steel wheel and smaller tyre isn't going to save enough weight to make a noticeable difference. Even removing the wheel altogether is only going to save 18 kgs. Which is only worth about 0.05 seconds in 0-60 time or quarter mile.