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A comment on Show HN: I Designed and Built an eBike.

Re:Show HN: I Designed and Built an eBike by initplus on Wednesday February 23, 2022 @06:27PM (#30448135)
Curious why there is a derailleur, but seems to be only one fixed gear at the back? Guess you trust that motor to have enough torque to not need any rear gears?
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Re:Show HN: I Designed and Built an eBike by 8note on Wednesday February 23, 2022 @07:35PM (#30448790)
Adding to the other comments - chain tensioners look like derailleurs, but are much simpler/can't move the chain to different gears
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Re:Show HN: I Designed and Built an eBike by blackth0rn on Wednesday February 23, 2022 @06:36PM (#30448216)
on rear suspension bikes with a changing chain length you need something to account for that change in chain length so it doesn't go floppy at certain points of the rear swingarm motion.
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Re:Show HN: I Designed and Built an eBike by etcet on Wednesday February 23, 2022 @06:33PM (#30448195)
It's probably used to keep the chain under tension when the rear suspension moves around.
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Re:Show HN: I Designed and Built an eBike by gkasev on Wednesday February 23, 2022 @07:07PM (#30448544)
On a full suspension bike like this, the distance between the rear wheel and bottom bracket changes when the suspension works, so you need a way to compensate for this.
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