BMC offers the 300715 chain guide as a spare part for its Roadmachine road bike model. Its function is to hold the chain in place if it jumps off the crankset when changing gears.
Positioned between the frame and the small chainring, the 300715 chain guide also protects the frame paintwork, which can be damaged by the chain.
Chain guide
BMC Roadmachine
BMC reference 300715
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