Cassette shaking when motor spinning normal?

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eecsflyer   10 mW

10 mW
Posts: 20
Joined: Apr 11 2020 1:23pm

Cassette shaking when motor spinning normal?

Post by eecsflyer » Apr 26 2020 11:16am

I just installed a Crystalyte hub motor in a prelaced wheel from Grin tech on my handcycle. When I let the motor spin the wheel while the wheel is in the air and I am off the bike, the cassette oscillates side to side. It is subtle, but you can see it in this video

https://youtu.be/48pe9ilTm4E

Is this normal? Should I be worried?

kcuf   100 W

100 W
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Joined: Sep 29 2018 3:21pm

Re: Cassette shaking when motor spinning normal?

Post by kcuf » Apr 26 2020 11:21am

to be expected
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Electric Earth   100 W

100 W
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Joined: Nov 11 2018 8:02pm

Re: Cassette shaking when motor spinning normal?

Post by Electric Earth » Apr 26 2020 11:25am

Hmm... Whether or not it's normal for Those motors, I don't know, but I wouldn't be OK with it. I've been a cyclist my whole life, and I've never had that before, including on the couple cheapo hubmotors I've dealt with since getting into ebikes. I would very much think it's going decrease shifting consistency, likely cause premature cassette wear, and perhaps chain wear.

eecsflyer   10 mW

10 mW
Posts: 20
Joined: Apr 11 2020 1:23pm

Re: Cassette shaking when motor spinning normal?

Post by eecsflyer » Apr 26 2020 11:41am

kcuf wrote:
Apr 26 2020 11:21am
to be expected
Is this something that goes away with use? Do you know why this happens?

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MadRhino   100 GW

100 GW
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Joined: Sep 03 2010 5:28pm
Location: Montreal QC Canada

Re: Cassette shaking when motor spinning normal?

Post by MadRhino » Apr 26 2020 12:25pm

I was going to say no it is not normal, but then I saw it is a Clyte H35... :D
Make it fool-proof, and I will make a better fool.
Current bikes
Street:
Trek Session 10 mod. Variable geometry. 70mph
Dirt:
Santa Cruz V10. 50mph

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MadRhino   100 GW

100 GW
Posts: 7010
Joined: Sep 03 2010 5:28pm
Location: Montreal QC Canada

Re: Cassette shaking when motor spinning normal?

Post by MadRhino » Apr 26 2020 1:02pm

Seriously...
Even though brand new Clyte H35 often are out of true, it is not proven yet that it is the origin of your ´problem’. It could be the cheap freewheel itself. Also, freewheels often have a lateral play, and could be moving in and out slightly when the wheel is spinning off the ground, in reaction to a wheel lacing out of true, or a tire mounted with the bead that is not perfectly aligned. Don’t worry much about that. Freewheels never last a lot of mileage on motors anyway, unless you buy expansive ones.
Make it fool-proof, and I will make a better fool.
Current bikes
Street:
Trek Session 10 mod. Variable geometry. 70mph
Dirt:
Santa Cruz V10. 50mph

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