well, i just looked at the weights on the tyres then...
they read like this:
Wheel 1: 2 x 15g
Wheel 2: 1 x 30g, 1 x 15g
Wheel 3: 2 x 10g
Wheel 4 (that we identified as having the hop in it): 1 x 10g, 1 x 20g
I'm not driving the car with these rims/tyres every day... they're being used solely for track work (i.e. not very often at all)... so hopefully it won't come to the point of wearing shocks etc.... realistically, i should feel the car shaking before it comes to that anyway, shouldn't I? I guess if it is shaking more than just a little bit i'll probably just put my street tyres back on in place or something
I got myself 4 x second hand (good condition) Bridgestone RE55s in SR compound (according to this diagram, the 'hardest')