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what happens when the chain says bang in a hill?



 
 
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  #11  
Old March 16th 15, 04:46 PM posted to rec.bicycles.tech
Frank Krygowski[_4_]
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Default what happens when the chain says bang in a hill?

On 3/15/2015 10:26 PM, Emanuel Berg wrote:
Frank Krygowski writes:

Lou's right, of course. And if you install a new
rear sprocket and new chain, the problem will go
away.


Really? This happens only in stiff hills but yes, it
would be nice to be able to apply all power I can
muster with no worries whatsoever neither the rear
wheel will be disaligned against the frame nor the
scary bam-bam chain manners.

Can I somehow confirm the rear sprocket and/or chain
are defect? Besides climbing a hill, I mean.


Yes. It's easy to measure chain wear; and if your chain is worn too
much, your sprocket will also be worn too much.

See http://sheldonbrown.com/chains.html#stretch

Read the section "Chain and Sprocket Wear" then pay special attention to
the portion toward the bottom beginning with "Measuring Chain Wear."


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- Frank Krygowski
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  #12  
Old March 16th 15, 04:49 PM posted to rec.bicycles.tech
Frank Krygowski[_4_]
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Default what happens when the chain says bang in a hill?

On 3/15/2015 10:21 PM, Emanuel Berg wrote:
Lou Holtman writes:

The chain wear doesn't match the wear of the cogs
used during climbing.


That explains the stubbornness and then sudden bang
jump but how is it that the chain wear is higher
relative cog ditto during *climbing*? I understand why
climbing requires more power in general but how come
this isn't evenly distributed so that the only thing
to it was more power from the human riding the bike?


It's explained, at least generally, in the "Skipping Chain" section at
http://sheldonbrown.com/brandt/chain-care.html

If you need more detail, we can give it here. But it's more practical
to just fix it and be done.

--
- Frank Krygowski
  #13  
Old March 25th 15, 02:04 AM posted to rec.bicycles.tech
Gregory Sutter
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Default what happens when the chain says bang in a hill?

On 2015-03-16, Emanuel Berg wrote:

Really? This happens only in stiff hills but yes, it
would be nice to be able to apply all power I can
muster with no worries whatsoever neither the rear
wheel will be disaligned against the frame nor the
scary bam-bam chain manners.


Yes, you _should_ be able to apply all the power you can muster.

- If doing so causes your chain to skip _without_ the wheel slipping
out of place, follow Lou's advice and get a new chain and cog.

- If doing so causes your wheel to slip out of its proper place
in the dropouts, then your axle nuts are not tight enough, or not
evenly tensioned. Tighten them evenly. You may have to clean up
the dropouts to remove caked-on dirt, grease, or anything keeping
the knurled ridges on the nuts from clamping fully.

Note that those are two separate problems. As you've described the
problem, it might be that your power pulls the wheel out of line, at
which point the spacing on the chain changes and, as a result of the
wheel movement, your chain skips. So first make sure the wheel won't
move out of place, and then evaluate your chain.

--
Gregory S. Sutter Mostly Harmless

http://zer0.org/~gsutter/
  #14  
Old March 26th 15, 12:05 AM posted to rec.bicycles.tech
[email protected]
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Default what happens when the chain says bang in a hill?


Yes, you _should_ be able to apply all the power you can muster.

......

IF WE POLL RBT...how many bikes take full power from vey low speeds ?

my bikes do not.
 




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