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Stromer ST1 Ebike chain keeps popping off

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Stromer ST1 Ebike chain keeps popping off

Old 06-02-22, 04:16 PM
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psychoanalyst
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Stromer ST1 Ebike chain keeps popping off

Hello,

I originally had a 52T chainring (130 bcd) on my Stromer, which I upgraded to a 54T (SRAM x-sync) to help with 2 separate issues

(a) the chain kept popping off with a 52T chain-ring and
(b) I routinely found myself spinning out

The LBS suggested upgrading to a 54T chain-ring to fix both issues and it certainly helped, but it can be better.

The primary issue I am still facing is the chain popping out, especially when I am riding over a bump at speed. I am less bothered by the spin out, but do feel I could use some room there.

Is a 56T chain-ring a realistic option here, is it the chain itself that is the problem?

Thanks!
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Old 06-02-22, 04:33 PM
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If it is a matter of the chain being loose, why not just shorten it?
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Old 06-02-22, 06:23 PM
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More details about your setup are needed. You talk about your chainring. Do you only have one? If so, do you have a derailleur or chain guide to keep the chain in place? Unless your chainring is designed for a single chainring setup you will run the risk of front chain derailment without a chain guide
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Old 06-02-22, 08:56 PM
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Spinning out? Please. What kind of speeds are we talking about? I seriously doubt you were really doing that.
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Old 06-02-22, 09:47 PM
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Originally Posted by cxwrench
Spinning out? Please. What kind of speeds are we talking about? I seriously doubt you were really doing that.
I agree. Are you riding at highway speeds on an interstate? What cadence are you spinning at?
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Old 06-03-22, 10:59 AM
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Have you tried a "narrow/wide" chainring. It solved a similar problem for me.
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Old 06-03-22, 11:59 AM
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pedal assist ebike with 38 mph..... 52 cransk and 11-42 standard, so if assisted and going 38, maybe close to spinning out?

seems like bad design some place if dropping chain
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