Just seen this old post of yours.
I have been wanting to put some different tyres on my 172 Cup as I just dont like the Rain Spott 3’s that it came with, the side walls are just too soft for me.
I have a spare set of Williams wheels that I had sort of forgotten about, that would be a great way for me to have some different tyres on the car.
What size tyres did you fit on your rims? Did they mess around with the speedo accuracy at all?
What about off set etc, did you need spacers?
I want to do something to enhance the handling
Holy thread bump batman! lol!
I run 195/50 R15 Michelin PS3 tyres on the Williams wheels, the offset of them is ET36 so like running 7mm spacers all round so they bolt straight on with no issue and fill the arches slightly better with no scrubbing issues even when lowered (in these pics think it was on cooksport springs and standard shocks).
I also ran spacers along with the wheels in these pics, 15mm front and 10mm rear iirc and that did cause some rubbing but I just coped with it as it looked ace, lol!
don't really notice any speedo issues, the speedo isn't mega accurate anyway in all honesty on the original wheels and tyres.