Originally posted by Silv Blt
Actually, it doesn't matter either way. The only way it matters is if the veins inside the rotor have a direction and those are only on expensive brakes. Ours are all radial.

exactly. the slots are irrelevant in relation to which way the rotor gets mounted. the only thing you hafta look for is if your rotors are directionally vaned. obviously we can't see that from the picture you posted. if the internal vanes go straight out from the center of the rotor you can mount them on either side. whichever way you think looks nicer is fine. usually only high end rotors are directionally vaned so you prolly don't hafta worry. FYI if for some reason your rotors are directionally vaned you want them installed such that when the wheel is spinning it forces air outward through the vanes.