• Cracking. I wanted to buy a set of flat mount RX4s anyway so I could buy one flat, one post and just replace the post mount one when I move the groupset to a new frame.

    Do they require anything different in terms of hose fittings than Shimano brakes?
    I know absolutely nothing about hydraulic brakes.
    If I buy those calipers and have 8070 levers, what do I need to buy to have them working?

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