
Average Reviews:

(More customer reviews)What a brilliantly simple invention! I bought one of these for my wife's Trek mountain bike after she'd lived with one of these on her Jamis road bike with a compact double crankset. Never had the chain fall onto the bottom bracket. I had to trim the plastic a bit to allow the clamp to close tightly around my seat post; but after that, it went on easily. It seems to be made for larger diameter tubes. Does exactly as advertised.
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Prevents chain derailment when shifting to inner ring. Mounts to most seat tubes with hidden band clamp.
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