• They came off an old mtb and are unbranded unfortunately so I can't help you out with a brand or model @tallsam @Gaston.
    However they are quite similar to the Avid Tri-Align cantis which are kinda expensive but you can find cheaper alternatives on the bay. I've maxed them out to get them to work but they do work.

    As for the tyres @B0N0R, they are 35c on a 25mm rim man. Could go slightly bigger too.

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