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Old 05-18-09, 10:53 PM   #1
pcrman
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105 woes

I have a 09 Felt Z35 with 105 group. Compact 50/34, 11/25 cassette. I have had continual probs with the RD when climbing in the small chainring--skipping around on the cassette intermittently. I have 2500 miles on the bike, mostly commuting flat roads.
It has been back to the LBS 4 times, and is fine until I get up out of the saddle or power hard in the small ring during weekend climbing. The shop is very good (Wheelworks in Davis CA) and I don't doubt they know what they're doing, but is something else other than a finicky RD going on? Stretched chain?
Just frustrated, and looking for some advice before I go in yet again and feel like a petty anal complainer. I can't stand the skipping.

Thanks.
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Old 05-18-09, 11:05 PM   #2
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Originally Posted by pcrman View Post
I have a 09 Felt Z35 with 105 group. Compact 50/34, 11/25 cassette. I have had continual probs with the RD when climbing in the small chainring--skipping around on the cassette intermittently. I have 2500 miles on the bike, mostly commuting flat roads.
It has been back to the LBS 4 times, and is fine until I get up out of the saddle or power hard in the small ring during weekend climbing. The shop is very good (Wheelworks in Davis CA) and I don't doubt they know what they're doing, but is something else other than a finicky RD going on? Stretched chain?
Just frustrated, and looking for some advice before I go in yet again and feel like a petty anal complainer. I can't stand the skipping.

Thanks.
Streatched chain or worn cassette
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Old 05-18-09, 11:12 PM   #3
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check the chain for wear.

take a 12" ruler, measure a 12" section of the chain in at least 3~4 points.

if the chain is under 12-1/16" then there must be something else causing the chain to skip.
if the chain is between 12-1/16" and 12-1/8" it is time to get a new chain.
if the chain is beyond 12-1/8" then you will have to get a new chain and cassette, but probably don't have to get a new inner chainring.
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Old 05-19-09, 01:34 AM   #4
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When I experience a problem like this, it's often due to misalignment of the hanger tab. The tab can get bent in quite easily when made of aluminum.

Get your eyeball lined up with the rear of the drivetrain. Is the derailleur cage perfectly aligned with the sprockets on the rear cassette?
Does Wheelworks have the alignment tool for this?
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Old 05-19-09, 05:56 AM   #5
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+1 on Metzinger comment. Have the shop check the hanger alignment with the alignment tool. The misalignment is difficult to see sometimes.
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Old 05-19-09, 06:18 AM   #6
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Ain't nothing wrong with 105. 2500 miles is about right for a 10 speed chain replacement. What's happening is it's fine until you put stress on the rear triangle and the frame starts to flex. Make sure RD hanger is aligned properly.
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Old 05-19-09, 10:43 AM   #7
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Thanks. Actually the last time I took it in they said the rear hanger was bent and they fixed it. I'll check the chain for wear. I am surprised they don't last longer.
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Old 05-19-09, 11:15 AM   #8
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10 speed chains wear significantly faster than 9 speed ones since they are thinner. A lot depends on your riding style as well.
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Old 05-19-09, 11:42 AM   #9
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You can also get a chain wear gauge for pretty cheap, it can be worth having. Hang it on a hook right by your bike and make it part of your pre- or post-ride routine. If you replace the chain as soon as it wears out, you'll save yourself money on casettes and chainrings i the long run.

Edit: Another thing occurred to me: check the rear derailer cable where it runs under the bottom bracket. It usually goes through a plastic cable guide but the naked cable is exposed to water and road grit. When you stand up and pedal hard, the bottom bracket flexes slightly (even on a Felt!). If there is rust on the cable or any dirt or grit it can cause the cable to pull slightly as the BB flexes. You can also lubricate the cable here from time to time, but use a very light lube- if you use a sticky lube it can attract dirt.

Last edited by PunctualAlex; 05-19-09 at 11:46 AM.
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Old 05-19-09, 01:22 PM   #10
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I thought my 11T and 12T was skipping under load but turns out the lock ring was loose.

Last edited by SSSTANG; 05-19-09 at 01:26 PM.
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