Maybe, but pretty sure they were 175 - rare 30 years ago. I think they were American? My mate had some goodyear ultragrips, agen long gone.I think I'm been miss understood here, the S brakes where rubbish compared to the metro 4 pots I had on before I changed back to 10 inch wheels.
I now have metro vented disc's turned down to 7.5" and 4 pots, there nearly as good now. Obviously the 175/50x13 tyres had something to do with it.
Those would be 165/70x12 minimutly.