Yun bro yung mounting ng disk brake sa fork... IS mount (see argyle) is the old type tapos yung Post (talas) is the latest standard, or maybe not. Hehe. Maganda gamitin yung post mount lalo na kung dedicated yung fork sa size nung rotors mo kasi di mo na kelangan ng adaptor, pero in some cases kelangan pa rin. Basta ganun. Hehe.
IS mount...

POST mount...

Hope this helps. ;D
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43 ka ba?