Originally Posted by
Doosh
Any version of the 5mm finned rotor will be fine. I have one wheel with the older 5mm finned rotor from the 2009 race program, and I actually like it better than the newer part with the slots (that don't go all the way through the rotor like the holes did) milled in it. It's probably the wheel itself as much as the rotor.
For me, the main thing is keeping the cost down on the parts. I have three front wheels between two bikes, and between racing and teaching, I can expect to need to replace two of them this year. After a while, the rotors just lose their grip.