• ^

    Stops possible chain fall off I think, DH bikes used to have chain devices that weren't dissimiliar on the front chain ring.

    I think it is a bit excessive, but When ragging the bike hard from the lights my chain tensioner gives it up sometime and you can feel the whole thing go slack, though ** crosses fingers ** the chain has not come off yet.

    I prefer the kits with lots of little spacers because it makes it a piece of piss to get the chainline bang on.

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