For some bikes without a front derailleur (single to nine back gears) the chain can come off easily.
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updated June 10, 2020

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For some bikes without a front derailleur (single to nine back gears) the chain can come off easily. This cover prevents that from happening. It is designed so it fits a standard (35 mm) seat post and 200 mm frontal chain ring.

Designed originally for a Bafang MTB rear hub e-bike (Biltema Yosemite EX-TRAIL)

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The author marked this model as their own original creation. Imported from Thingiverse.

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