"Skipping gears" after new chain and rear derail. pulleys
#26
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The new components act fine on a bike stand, pedaling at the smallest cassette cog. I even simulated added torque applying small amount of brake.
All power transmission and gear shifting, on the stand, is smooth and crisp.
BUT ... the problem remains on the road under actual conditions. Essentially, the three smallest cogs (on the HG50 7-speed cassette) are now useless.
I did notice that the skipping is worst when torque is light to moderate. If I apply the brake slightly to increase torque, the skipping reduces.
I'd have to say that in the 27 years I've owned this bike -- over a dozen chains, and three cassettes -- this is the first time I've encountered this issue.
AGAIN: On the stand ... what issue ? ?
All power transmission and gear shifting, on the stand, is smooth and crisp.
BUT ... the problem remains on the road under actual conditions. Essentially, the three smallest cogs (on the HG50 7-speed cassette) are now useless.
I did notice that the skipping is worst when torque is light to moderate. If I apply the brake slightly to increase torque, the skipping reduces.
I'd have to say that in the 27 years I've owned this bike -- over a dozen chains, and three cassettes -- this is the first time I've encountered this issue.
AGAIN: On the stand ... what issue ? ?
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#27
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Hard to find a replacement ... that teeth ratio, 13-23, is quite ideal for my commuting use.
Anyway ...
A local eBay seller had this so I went with it ...
"New Shimano CS-HG41 7-Speed Bicycle Cassette Sprocket Hyperglide - 11-28T"
https://www.ebay.com/itm/New-Shimano...T/173885710869
About $19.00 total delivered. Should be here in a few days.
Anyway ...
A local eBay seller had this so I went with it ...
"New Shimano CS-HG41 7-Speed Bicycle Cassette Sprocket Hyperglide - 11-28T"
https://www.ebay.com/itm/New-Shimano...T/173885710869
About $19.00 total delivered. Should be here in a few days.
#28
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I don't get it.
Growing up with 10-speed Peugeots, Raleighs and Schwinns ... riding thru salt and snow ... never washing these bikes ... and lubing twice a year (if that!) ... and NEVER replacing chains (much less freewheels, etc) ... I don't ever recall skipping or jumping issues.
Growing up with 10-speed Peugeots, Raleighs and Schwinns ... riding thru salt and snow ... never washing these bikes ... and lubing twice a year (if that!) ... and NEVER replacing chains (much less freewheels, etc) ... I don't ever recall skipping or jumping issues.
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I don't get it.
Growing up with 10-speed Peugeots, Raleighs and Schwinns ... riding thru salt and snow ... never washing these bikes ... and lubing twice a year (if that!) ... and NEVER replacing chains (much less freewheels, etc) ... I don't ever recall skipping or jumping issues.
Growing up with 10-speed Peugeots, Raleighs and Schwinns ... riding thru salt and snow ... never washing these bikes ... and lubing twice a year (if that!) ... and NEVER replacing chains (much less freewheels, etc) ... I don't ever recall skipping or jumping issues.
Also, if you never lube your chain they'll wear faster so when you do change the chain you'll be forced to change the cassette as well. Not a big deal if the cassette is inexpensive but if you're running expensive cassettes it pays to keep up with your chain maintenance.
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I don't get it.
Growing up with 10-speed Peugeots, Raleighs and Schwinns ... riding thru salt and snow ... never washing these bikes ... and lubing twice a year (if that!) ... and NEVER replacing chains (much less freewheels, etc) ... I don't ever recall skipping or jumping issues.
Growing up with 10-speed Peugeots, Raleighs and Schwinns ... riding thru salt and snow ... never washing these bikes ... and lubing twice a year (if that!) ... and NEVER replacing chains (much less freewheels, etc) ... I don't ever recall skipping or jumping issues.
You don’t get why you never experienced the effects of a new chain on a worn cassette when you never replaced your chain?
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#32
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I don't get it. Growing up with 10-speed Peugeots, Raleighs and Schwinns ... riding thru salt and snow ... never washing these bikes ... and lubing twice a year (if that!) ... and NEVER replacing chains (much less freewheels, etc) ... I don't ever recall skipping or jumping issues.
If you never replaced your chains, then you never experienced the mis-match of a new chain on a worn sprocket.
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#33
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Huh??
See post 17, second to last sentence.
https://www.bikeforums.net/21522364-post17.html
If the "mismatch" issue was/is common, as many of the commenters in this thread are claiming, then wouldn't chain and cassette would be sold in sets? And/or chain or cassette instruction manuals note that phenomena contextually? And/or bike books and YouTube videos and Internet articles/blogs note the "mismatch" issue?
If you know of any specific references, outside of BF, please provide a hyperlink.
Another thing .... many of you are pointing to the cassette as the culprit. I concur it may be the reason (tho' from my inspection, usage notes, and photos, I don't think it's that worn) .... but it may very well be the KMC chain (being overly sensitive or poor QC) . In prev. years, I've used SRAM and SHIMANO, w/o concurrent cassette replacement (in fact, that's the norm for me and most folks) ... and, surprise .... NO SKIPPING ISSUES!!!
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ps: you need a new cassette
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Hard to find a replacement ... that teeth ratio, 13-23, is quite ideal for my commuting use.
Anyway ...
A local eBay seller had this so I went with it ...
"New Shimano CS-HG41 7-Speed Bicycle Cassette Sprocket Hyperglide - 11-28T"
https://www.ebay.com/itm/New-Shimano...T/173885710869
About $19.00 total delivered. Should be here in a few days.
Anyway ...
A local eBay seller had this so I went with it ...
"New Shimano CS-HG41 7-Speed Bicycle Cassette Sprocket Hyperglide - 11-28T"
https://www.ebay.com/itm/New-Shimano...T/173885710869
About $19.00 total delivered. Should be here in a few days.
If you didn’t, you’ll need a new chain to replace your new chain.
-mr. bill
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@elcyc , my experience in a very similar situation: https://www.bikeforums.net/general-c...kmc-chain.html
(The topic starts out with the link then meanders into cassette replacement.)
I hope you tell us what you end up with for a cassette because I'm going to need to replace an HG50 (or lay it in as a spare for whenever I do need it) pretty soon too.
(The topic starts out with the link then meanders into cassette replacement.)
I hope you tell us what you end up with for a cassette because I'm going to need to replace an HG50 (or lay it in as a spare for whenever I do need it) pretty soon too.
#37
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If the "mismatch" issue was/is common, as many of the commenters in this thread are claiming, then wouldn't chain and cassette would be sold in sets?
And/or chain or cassette instruction manuals note that phenomena contextually? And/or bike books and YouTube videos and Internet articles/blogs note the "mismatch" issue?
If you know of any specific references, outside of BF, please provide a hyperlink.
If you know of any specific references, outside of BF, please provide a hyperlink.
https://www.sheldonbrown.com/chain-wear.html
Another thing .... many of you are pointing to the cassette as the culprit. I concur it may be the reason (tho' from my inspection, usage notes, and photos, I don't think it's that worn)
In prev. years, I've used SRAM and SHIMANO, w/o concurrent cassette replacement (in fact, that's the norm for me and most folks) ... and, surprise .... NO SKIPPING ISSUES!!!
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#39
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To control the experiment, I'm re-installing the orig (3-year old) KMC chain back onto this cassette until the new cassette arrives.
#40
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Enough force is not the issue.
When the chain is moving (bike moving with me pedaling, as normal), some of the chain is "airborne" with less "dynamic" contact area "per square inch". And this seems to be when the issue occurs. But I don't understand why I can't replicate the skipping issue on the stand (applying some braking, or other tire friction, to simulate road resistance, as noted earlier). It may be that road vibrations (rubber against the road), aka sympathetic vibrations and "resonance", are the missing variables in this confusing equation ? ? ?
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"Enough" force, in my experiments, is not the issue, as I noted earlier. With the bike not moving (say front wheel against a tree), I can shift to the smallest cog, and push the pedal (with feet in usual position) as hard as possible. NO SKIP.
When the chain is moving (bike moving with me pedaling, as normal), some of the chain is "airborne" with less "dynamic" contact area "per square inch". And this seems to be when the issue occurs. But I don't understand why I can't replicate the skipping issue on the stand (applying some braking, or other tire friction, to simulate road resistance, as noted earlier). It may be that road vibrations (rubber against the road), aka sympathetic vibrations and "resonance", are the missing variables in this confusing equation ? ? ?
When the chain is moving (bike moving with me pedaling, as normal), some of the chain is "airborne" with less "dynamic" contact area "per square inch". And this seems to be when the issue occurs. But I don't understand why I can't replicate the skipping issue on the stand (applying some braking, or other tire friction, to simulate road resistance, as noted earlier). It may be that road vibrations (rubber against the road), aka sympathetic vibrations and "resonance", are the missing variables in this confusing equation ? ? ?
#42
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Just curious ... anyone know of source for JUST cassette COGS (i.e., w/o cassette)?
Looking for 13 , 14 , 15T cogs for 7/8-spd chain.
PayPal works for me .. PM if you can help. Thx.
P.S. I still plan on installing the new HG41 cassette when it arrives. But (a) it is not an HG50 "grade" and (b) I specifically want the (hard to find in a cassstte ) 13 , 14 , 15T cogs as they are most useful in my application.
P.S.
An old thread (I did end up getting that HG50, a little over a year after this thread --- that's the one in question now):
https://www.bikeforums.net/bicycle-m...ct-why-so.html
Looking for 13 , 14 , 15T cogs for 7/8-spd chain.
PayPal works for me .. PM if you can help. Thx.
P.S. I still plan on installing the new HG41 cassette when it arrives. But (a) it is not an HG50 "grade" and (b) I specifically want the (hard to find in a cassstte ) 13 , 14 , 15T cogs as they are most useful in my application.
P.S.
An old thread (I did end up getting that HG50, a little over a year after this thread --- that's the one in question now):
https://www.bikeforums.net/bicycle-m...ct-why-so.html
Last edited by elcyc; 06-09-20 at 09:25 AM.
#43
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You have rejected all the advice of experienced mechanics here. Have fun figuring it out.
<plonk>
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Just curious ... anyone know of source for JUST cassette COGS (i.e., w/o cassette)?
Looking for 13 , 14 , 15T cogs for 7/8-spd chain.
PayPal works for me .. PM if you can help. Thx.
P.S. I still plan on installing the new HG41 cassette when it arrives. But (a) it is not an HG50 "grade" and (b) I specifically want the (hard to find in a cassstte ) 13 , 14 , 15T cogs as they are most useful in my application.
Looking for 13 , 14 , 15T cogs for 7/8-spd chain.
PayPal works for me .. PM if you can help. Thx.
P.S. I still plan on installing the new HG41 cassette when it arrives. But (a) it is not an HG50 "grade" and (b) I specifically want the (hard to find in a cassstte ) 13 , 14 , 15T cogs as they are most useful in my application.
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#45
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Huh???
See post 17, second to last sentence.
https://www.bikeforums.net/21522364-post17.html
If the "mismatch" issue was/is common, as many of the commenters in this thread are claiming, then wouldn't chain and cassette would be sold in sets? And/or chain or cassette instruction manuals note that phenomena contextually? And/or bike books and YouTube videos and Internet articles/blogs note the "mismatch" issue?
If you know of any specific references, outside of BF, please provide a hyperlink.
Another thing .... many of you are pointing to the cassette as the culprit. I concur it may be the reason (tho' from my inspection, usage notes, and photos, I don't think it's that worn) .... but it may very well be the KMC chain (being overly sensitive or poor QC) . In prev. years, I've used SRAM and SHIMANO, w/o concurrent cassette replacement (in fact, that's the norm for me and most folks) ... and, surprise .... NO SKIPPING ISSUES!!!
See post 17, second to last sentence.
https://www.bikeforums.net/21522364-post17.html
If the "mismatch" issue was/is common, as many of the commenters in this thread are claiming, then wouldn't chain and cassette would be sold in sets? And/or chain or cassette instruction manuals note that phenomena contextually? And/or bike books and YouTube videos and Internet articles/blogs note the "mismatch" issue?
If you know of any specific references, outside of BF, please provide a hyperlink.
Another thing .... many of you are pointing to the cassette as the culprit. I concur it may be the reason (tho' from my inspection, usage notes, and photos, I don't think it's that worn) .... but it may very well be the KMC chain (being overly sensitive or poor QC) . In prev. years, I've used SRAM and SHIMANO, w/o concurrent cassette replacement (in fact, that's the norm for me and most folks) ... and, surprise .... NO SKIPPING ISSUES!!!
Go buy a new chain and report back.
Last edited by Kapusta; 06-09-20 at 10:22 AM.
#46
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BTW: You somehow ignored my experiment with bike on stand, pedaling, with resistive load on the tire/wheel (e.g. light braking). You also ignored my theory about road vibration being -- potentially -- the random element.
Last edited by elcyc; 06-09-20 at 03:15 PM.
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#47
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Three-CR crank ... and I mostly use the middle ring. 31T Deore. Which,btw, i replaced only about a week ago.
#48
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If the "mismatch" issue was/is common, as many of the commenters in this thread are claiming, then wouldn't chain and cassette would be sold in sets? And/or chain or cassette instruction manuals note that phenomena contextually? And/or bike books and YouTube videos and Internet articles/blogs note the "mismatch" issue?
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unbelievable....
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