gears skipping under load

gregcampbell
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gears skipping under load

Postby gregcampbell » Tue Jan 23, 2018 7:07 pm

Why do my high ratio gears slip when I'm out of the saddle, but behave perfectly in the saddle?

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ColinOldnCranky
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Re: gears skipping under load

Postby ColinOldnCranky » Tue Jan 23, 2018 9:02 pm

Have you changed your chain recently? Or, failing that, your rear cluster?
Unchain yourself-Ride a unicycle
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RonK
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Re: gears skipping under load

Postby RonK » Tue Jan 23, 2018 9:24 pm

Most likey your chain and cassette is worn out.
Also a new chain on a worn cassette will often slip.
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Duck!
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Re: gears skipping under load

Postby Duck! » Tue Jan 23, 2018 10:40 pm

You're putting more load through when standing, uncovering issues with excessively or unevenly worn components.

If you tend to use those gears less than the mid- & lower-range gears, those sprockets will be less worn, and the worn chain will not mesh nicely. You may also notice a rumbly, gritty sensation when riding those gears while seated; the chain isn't meshing well, but in that position you're not overloading the chain/sprocket interface to cause it to slip.
I had a thought, but it got run over as it crossed my mind.

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Nate
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Re: gears skipping under load

Postby Nate » Wed Jan 24, 2018 12:48 pm

as above worn components...

or.... does it click or make noises when not under load?
if its clicking when not under load, then the deraileur could be *slightly* out of alignment, which on high gears could be caused by a frayed shifter cable.

Open the brakes up, apply brakes & have a look inside to check that too.

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kb
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Re: gears skipping under load

Postby kb » Wed Jan 24, 2018 1:11 pm

Nate wrote:as above worn components...

or.... does it click or make noises when not under load?
if its clicking when not under load, then the deraileur could be *slightly* out of alignment, which on high gears could be caused by a frayed shifter cable.

Open the brakes up, apply brakes & have a look inside to check that too.

Alignment issues can also be caused by improper cable path in the cable clamp (there’s a clear park tools video on it somewhere - I’ll chase it up if I remember)
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rowdyflat
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Re: gears skipping under load

Postby rowdyflat » Wed Jan 24, 2018 1:42 pm

if they are jumping higher then prolly derailleur cable slt stretched turn doodah anticlockwise.
jumping everywhere bent derailleur hanger ?

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