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This is the chain guide that started it all. Literally. Sandwich style, the System 1 gets it done with a guide ring inboard and outboard of your chainring. It’s super simple and extremely reliable. Frequently imitated, never duplicated, the original System 1 is still one of Steve Peat’s favorites. Designed primarily for frames with elevated chainstays (may require longer BB spindle).
Single-chainring complete guide system
ISCG or BB Mount
36-40T, 36-44t, or 44-50t
104mm, 94mm, 110mm or 112mm BCD
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