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  1. As others said they’re U-brakes. We used to call them 990’s on bmx’s back in the day not sure if that still holds.

    I bought an old frame with these on the back, also under the chain stay. I had to replace the brakes and got a decent cheap pair from a BMX store. They’re a different pull ratio to other brakes so either keep the handle you have or get the right one. I bought a full kit that made it easy.

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