Hi paulp. The outside diameter of the tyre will be the same as your other four tyres. The 16" refers to the inner diameter of the spare tyre and will have a greater side wall than the 18". Max speed for spare will be 50mph when fitted as its only to be used whilst the originally fitted tyre is repaired or replaced. The same spare will be supplied across all models in the range regardless of whats on view externally.
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