The best replacement for chain guide is chain tensioner.

The best alternatives to chain guide are rated as following:
★★★★★  chain tensioner
★★★★★  bash guard

Your alternative for chain guide is not listed? Suggest!
Speaking about chain guide, one probably shouldn't forget about bash guard.

Other search terms related to chain guide and their ratings are:
★★★★★ bash guard
You have in mind a companion for chain guide and it is not yet here? Propose!



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chain guide
chain tensioner
bash guard