Those wheels were designed for running M+S tyres, these would have been 185/55-15 on a GTI G60 and most likely 205/50-15 on a Rallye. I have been trying a while to remember what was on the Fahrzeugbrief that came with my GTI G60 as that stated what was allowable.
For me you could get away with anything between 185/55 to 205/50 and not be wrong. I personally always ran 195/50s. 45 series will probably affect the speedo reading too much.
Gavin
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