Join Date: Dec 2004
Bikes: 92 Giant Sedona ATX Custom
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The brands that use 4 bolts are limited and not standard anymore. Coda and Rockshox were the main ones to use the 4 bolt setups. Go with 6 bolt so you can get replacement parts without a headache. That is unless the Shimano Centerlock self-fastening rotors turn you on. The center locks are a simpler setup, but as of yet all but restricted to shimano. If you are a shimano type, then that's fine.