https://www.answers.com/individual-sports/On_a_bicycle_Is_the_rear_hub_ratchet_mechanism_necessary
On a bicycle Is the rear hub ratchet mechanism necessary? - Answers
Not really, but it sure makes riding easier. There are hubs w/o the ratchet mechanism, and they're called fixies, or fixed wheels. Some like them for the more...
on a bicycleratchet mechanism
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Hyena 250W Single-Speed Rear Hub Motor - Trek Bikes (GB)
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Bontrager Rapid Drive 108 Boost Rear Hub - Trek Bikes (BE)
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Bontrager Rapid Drive 108 Fat Rear Hub - Trek Bikes
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Bontrager Approved Loose Ball Road Rear Hub Axle Kit - Trek Bikes (MX)
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Bontrager Rapid Drive 108 Boost Rear Hub - Trek Bikes (JP)
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Bontrager Rapid Drive 108 Boost Rear Hub - Trek Bikes (BR)
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