Originally Posted by
ChaosMaster
Loosing 1kg of unsprung weight is like loosing 5kg of sprung weight. Having said that, there's a limit to much weight you can loose just from the rims themselves, as tyres weigh more than them. To get a decent set of lightweight racing rims will set you back 2k+ easily so their not the cheapest option. I'ld say money would be better spent elsewhere. If your knew the the track, I'ld suggest something like Kumho KU36. Really sticky tyres in the dry, and cheap for what they are. Tyre wear is a bit crap though, but then so are most tyres when you take them on the track.
Brake Pads will go really quickly, you may want to change over to some performance/track pads especially if you do intend to go tracking often. I think the disadvantage of track bias pads were that they're noiser when cold, and bitey which don't make them as suitable for road use. Road bias pads would go after a few hot laps on the track, although letting them cool down will bring back some bite.
Edit: Should add that cheap rims like Rotas are known to break under track pressure/stress. So if you do go aftermarket, it'll be premium or stock, and no cheap imitations.