I've heard from more then one person that the r1 branded products are just centric blanks that are grinded down by r1 themselves in house so are going to be weaker than an actual stoptech slotted rotor that is actually made to have the slots in it to begin with so i would stay away from the r1 branded stuff unless you arent planning on putting any abuse on them. If you can get r1 to match amazon prices on stoptech rotors i would go that route
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