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11T and 12T gears are slipping, can I use this cassette instead?

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11T and 12T gears are slipping, can I use this cassette instead?

Old 04-08-17, 05:34 PM
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SylvainG
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11T and 12T gears are slipping, can I use this cassette instead?

Hi, the 11 and 12 teeth gears (two smallest gears) on my cassette are skipping (11T gear is slipping several times per pedal's turn so unusable). The current cassette on my 2012 Giant TCX 2 is a "SRAM PG950 9-Speed Cassette, 11-26T". Can I replace it with a SRAM PG950 9-Speed Cassette, 11-28T" cassette instead?

Other question if you don't mind, which tool to I need to remove the cassette?

Thanks!
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Old 04-08-17, 05:36 PM
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Almost certainly. What rear derailleur?
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Old 04-08-17, 05:51 PM
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Hey, thanks for the quick response! This site is great :-)

It's a Shimano Tiagra.

I noticed that MEC is selling a PG950 11-34T 9Spd (tooth count is 11, 13, 15, 17, 20, 23, 26, 30, 34). Can this one fit too?

Thanks again!
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Old 04-08-17, 06:05 PM
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Old 04-08-17, 06:10 PM
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The teeth are worn down. They didn't look that bad until I clean the cassette but they are triangular in shape (no longer flat on top). Other cogs are fine, just the 11T and 12T cogs are like that. Looks like the previous owners mostly used only these two cogs...
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Old 04-08-17, 07:02 PM
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Originally Posted by SylvainG View Post
Hey, thanks for the quick response! This site is great :-)

It's a Shimano Tiagra.

I noticed that MEC is selling a PG950 11-34T 9Spd (tooth count is 11, 13, 15, 17, 20, 23, 26, 30, 34). Can this one fit too?

Thanks again!
If it's a 9 speed Tiagra, a 28 cog should be your largest practical cog size. The official Shimano rating for the derailleur is 27, but 28 should be no problem.

If you want to use a 34, this Deore derailleur is very suitable: http://harriscyclery.net/product/shi...silver-950.htm

http://www.chainreactioncycles.com/u...prd%7C139445US
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Old 04-08-17, 07:11 PM
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Thanks for the reply. MEC only has 11-26T and 11-34T cassettes in stock. I'll go with the original cassette size which was 11-26T. I just rode the biggest hill on my daily commute today and I wasn't even on the biggest cog. Mind you, I usually take that hill after riding for 40 minutes and not 10 minutes like today but I still should manage it.
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Old 04-08-17, 07:52 PM
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Actually, if I need more 'torque', I'll probably change my crankset to a triple chainrings instead of two. I noticed that my left Sora shifter needs to be 'cranked' twice to switch chainring. First crank only moves the cage a bit then the second crank makes it hop to the other chainring. Not used to that kind of shifter, so don't know if it's normal for a Sora shifter attached to a two chainring crankset to behave that way.
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Old 04-08-17, 07:52 PM
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You need a chain whip to keep the cassette from turning as you unscrew the lockring. And a cassette lockring tool for Shimano/Sram.

Park Tool has a Repair Guide with step-by-step instructions for all kinds of adjustments and repairs.
Here's the cassette removal guide.

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Old 04-08-17, 07:59 PM
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I have this guy that I bought last year for my Schwinn's freewheel. Will it work with the SRAM cassette?
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Old 04-08-17, 09:58 PM
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That only works on KMC cassettes
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Old 04-08-17, 10:12 PM
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I've only had 7, 8, and 10 speeds. On a 9 speed, are the bottom 1 or 2 gears separate from the cluster? If so.. could the cassette lock ring have been a little loose and those gears flopping around causing premature wear?
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Old 04-09-17, 08:48 PM
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The odds are your front chain ring is slipping and that it just so happens in those cogs. It's very hard to slip the two smallest cogs. Very easy to wear out front chainrings.

When things slip it's usually up front.

What caused it was a stretched out chain. Rotate four chains for the drivetrain has always Brennan the smart way to preserve components.
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Old 04-09-17, 10:10 PM
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Hi, thanks. Tomorrow, while going uphill, I'll keep it on the main chainring and my middle cog. If it also slips, then I guess that could be it? Mind you, the 11T cog is really worn out as you can see here:

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Old 04-11-17, 04:41 PM
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Update, the chain didn't slip while going uphill while on the big chainring and middle cog. Does this make it point more towards the 11T and 12T gears themselves then?
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Old 04-11-17, 06:24 PM
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Originally Posted by mtnbke View Post
The odds are your front chain ring is slipping and that it just so happens in those cogs. It's very hard to slip the two smallest cogs. Very easy to wear out front chainrings.
It's actually not hard at all to wear out cassette or freewheel cogs. Just keep running a worn chain. And the smaller the cog, the faster it'll wear.

Originally Posted by mtnbke View Post
When things slip it's usually up front.
Worn cogs often result in skipping, especially when paired with a new chain. Worn chainrings are less prone to skipping because more teeth are engaging the chain. A common problem with worn chainrings is "chain suck", where the chain doesn't cleanly disengage from the chainring. Teeth on a worn chainring develop a "shark tooth" profile that hooks the chain.

Originally Posted by mtnbke View Post
What caused it was a stretched out chain.
That we agree on.

Whether you rotate chains or just replace them periodically is personal preference. Either is WAY better than letting a worn, stretched-out chain grind away at your cogs and chainrings.
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Old 04-11-17, 07:24 PM
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What do you mean by rotating chains?

Edit: I believe this is what you mean? http://www.bikeforums.net/bicycle-mechanics/179171-rotation-method-chains-when.html

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Old 04-11-17, 09:41 PM
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Originally Posted by SylvainG View Post
What do you mean by rotating chains?
To rotate chains is to alternate between two or more chains. Say you've decided to rotate two chains, and let's call them "A" and "B". You'd use your "A" chain for a while -- maybe a few months -- then "B" for a similar amount of time, then keep alternating between them. The thinking is that chains wear faster than cassettes, so splitting the wear across multiple chains will better match the wear rate of a cassette. When you wear out the chains in your rotation, replace all the chains and the cassette together and repeat the cycle.

Personally, though, I just replace chains at a regular interval, before they get too worn. After a few chains, I'm probably due for a cassette. It may or may not be more efficient from a wear perspective, but it's certainly easier. Chains and cassettes are inexpensive enough that I'm not going to worry about maintenance schemes to try squeezing every last kilometer out of each one.
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Old 04-12-17, 05:16 PM
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So I ordered the 11T-28T to replace my 11T-26T. Since I'm only slightly increasing the biggest cog, will my current (correctly sized) chain be ok? Mind you, I still have the chain links that I removed when I changed the chain (didn't start slipping until I changed the chain) but I'll need to get pins. So if I have to lengthen it, is having more than one pin inserted be an issue?

Thanks,
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Old 04-12-17, 05:31 PM
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I'd be inclined to take everything apart and refurbish it all. It looks quite dirty. A good clean and lubrication works wonders.
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Old 04-12-17, 05:40 PM
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Yeah that's the best I could clean the cassette without taking it off. I now have the tools to take it off, which I'll need to do to install the new 11-28T cassette I ordered. That's why I'm now asking about the chain length since the new cassette is a bit bigger than the old one (11-26T).
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Old 04-13-17, 09:17 AM
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Originally Posted by SylvainG View Post
So I ordered the 11T-28T to replace my 11T-26T. Since I'm only slightly increasing the biggest cog, will my current (correctly sized) chain be ok?
The chain length is probably OK, assuming you weren't already cutting it close with the 26 tooth cog. Try it and check.

Originally Posted by SylvainG View Post
(didn't start slipping until I changed the chain)
That's the classic symptom of a worn cassette. (As if it wasn't obvious based on the pic you posted earlier.)

Originally Posted by SylvainG View Post
So if I have to lengthen it, is having more than one pin inserted be an issue?
No, it's not an issue. You could also opt to use a quick link like a KMC Missing Link, SRAM Powerlock, or Wippermann Connex instead.
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