Grp 4 Wheel sizes

[GaryFitz]

Does anybody know what size wheels and tyres ran on teh original Grp 4 cars?

[chris.richard]

12"x15" rears and 10"x15" fronts - on tarmac anyway. It would be much narrower on the safari & on snow. The works cars used Stradale rear sections on them.

[guy mayers]

12 inch rears ran 345*35*15 Pirelli P7s. An option was 10 inch rears running 285*45*15 but I very much doubt you could squeeze 10 inches under the front! 225*50*15 or 205*50*15 on 7 or 8 inch rims is more feasable!
I run the 345 and 225 option personally, grip is impressive but when it lets go......... 285 and 205 is more manageable apparently but not as visually impressive!
Guy