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One some cars you can use the bolts supplied for the alloys on the steel spare as they don't foul anything.I had an alloy wheeled Fiesta and the workshop manual said it was OK to use the bolts for alloys(tapered washer was part of the bolt) on steel wheels but not the other way round.
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On both my Alfa and my mondeo tdci I have used the alloy bolts on the steel spare. In the Alfa it is a true space saver whereas in the mondeo the wheel and tyre are of the same size as the fitted alloys. The Mondeo wheels also attach with nuts only, the bolts are in the hub.
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Thankfully on BMW`s the same set of bolts does both alloys and spacesaver.
Maybe this problem is unique to M. Benz. !!!!!
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Generally if you have NUTS with tapered washers on, they can be used and it is the BOLTS that may or may not have a problem due to the length of them.
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Some alloy wheels have a tapered seat that the base of the nut presses against. In this case the nuts will generally work on the space saver. Some aftermarket alloy wheels have nuts that incorporate a sleeve that fits into the hole in the wheel. There is then a step on the nut that fits flat on the surface of the wheel and clamps it to the hub. These do not generally work on space saver wheels.
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On both my Alfa and my mondeo tdci I have used the alloy bolts on the steel spare. In the Alfa it is a true space saver whereas in the mondeo the wheel and tyre are of the same size as the fitted alloys. The Mondeo wheels also attach with nuts only, the bolts are in the hub.
I suggest you check your Mondeo again - when I was looking (At Ghia's) the spare had a 1" smaller steel wheel and a higher profile tyre so is not the same size.
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I suggest you check your Mondeo again - when I was looking (At Ghia's) the spare had a 1" smaller steel wheel and a higher profile tyre so is not the same size.
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Although it's a lot thinner, I think it works out 0.5" smaller on outside diameter. This is about the same difference as between a new tyre and one worn down near the legal limit. It's a bit like putting the "just legal" tyre a lot of people use for a spare on, when you have new tyres on. It doesn't affect the ESP at all on mine.
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