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#2
12th November 2013, 07:23 PM
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No legal requirements I know of. However, a couple of observations. There is a significant variation in diameters of tyres with the same nominal size. Here are two 195/50R15 tyres:
 Also, 195/50R15 and 195/55R15 are both acceptable with the Sierra speedometer and drivetrain, the speed difference is only about 3%, but the diameter is different by about a centimetre. In other words, I would leave an inch or so if I were making new wing stays.
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Albert Haynes Roadster FAQ | Haynes Builder Locations Gallery, build thread in Lithuanian / via Google Translate. 
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