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  • Hey internet,

    Sorry to sound like a complete idiot, but I’ve just bought a frame with what I think are IS mounts and have flat mount SRAM hydro Rival calipers- I was wondering if anyone can let me know exactly the adapter I need? I’ve attached a couple of photos of the frame I have and the adapter in the photo is what I think I’m after.

    I’m currently running 160mm rotors front and back, but can change this if necessary.

    Any help would be appreciated!

  • As others have said, can't be done with stock parts. If you used huge 230mm discs it might be physically possible to make an adaptor to fit FM calipers but you'd have to have them custom made. Can you switch to post mount calipers instead? That would work.

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