whats the best size tyres to run on my 13inch ford alloys on the front and on the rear?

185 60 13 if they are 6 inches wide.

Second that......

I've found that balance seems about right with the rears 20mm wider than the fronts. But there are a lot of variables involved - weight, power, etc...

Hi,
Depends on what your main use of the car will be, track or road, short blasts or trips to coast etc, we have done most,
We used 185,60,13" first, had to run these to pass sva speed test, hard ride,
changed to 185, 70 latter, i believe that was the original design for these sevens, rides better on longer journeys (easier on the back, we are over 50 now). 70's seem to aid the suspension if your a bit out with spring rates etc( larger side wall).

Andy

im on 7x13 i run 185 60 up front 205 60 i think at the rear