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Old 09-18-06, 05:53 PM   #1
aloysius
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26 tooth cog with 105 short cage derailleur

Could I use a short cage 105 or ultegra 9 speed derailleur with a 26 tooth cog? Would it shift well?
Thanks,
Lynn
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Old 09-18-06, 06:05 PM   #2
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Cage length is more a function of your crankset (double/triple). Cage length does not determine cassette cog capacity. Shimano's spec for large cog on all road-type derailers (105, Ultegra, Dura-Ace, long or short cage) is 27T. So, most likely, unless you have a triple crankset (or double with a *huge* difference between large<>small ring), yes, a short-cage 105 will work just fine.
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Old 09-18-06, 06:12 PM   #3
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The size of the 26t cog is not a problem but since Shimano hasn't offered a 26 in some time I assume you are talking about running some other brand with a Shimano drivetrain and if so it may not shift as well as if it was all Shimano.

Al
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Old 09-18-06, 06:21 PM   #4
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Rear derailler cage length determines how much excess chain can be wrapped. The angle at which the cage pivots (and a couple of other variables) determine the largest cog the derailler can be used with, even if you were only using a single chainring up front.

Shimano's road-grouppo rear derailllers are usually listed as taking a max cog of 27t, although in practice they nearly always work on 28t and often even 30t.

Shimano's mtb-grouppo rear deraillers usually take a max cog of 32t of 34t.
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Old 09-18-06, 06:31 PM   #5
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I'm running a SRAM cassette with a 26t with an older Shimano 105 derailleur. I have no problems.
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Old 09-18-06, 09:34 PM   #6
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Quote:
Originally Posted by cuda2k
I'm running a SRAM cassette with a 26t with an older Shimano 105 derailleur. I have no problems.
Me too. Bike shifts great. My 105 short cage can take up a 53-26 combo.
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Old 09-18-06, 09:40 PM   #7
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Quote:
Originally Posted by aloysius
Could I use a short cage 105 or ultegra 9 speed derailleur with a 26 tooth cog? Would it shift well?
Thanks,
Lynn
i ran a 12-26 8sp w/ DA derailleur for years. 52 x 38 in the front. in fact i could have run a 28 but didn't need it.

ed rader
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Old 09-18-06, 09:42 PM   #8
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Quote:
Originally Posted by Al1943
The size of the 26t cog is not a problem but since Shimano hasn't offered a 26 in some time I assume you are talking about running some other brand with a Shimano drivetrain and if so it may not shift as well as if it was all Shimano.

Al
I'd be running a Sram pg-950; that's compatible with shimano road stuff, right?
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Old 09-18-06, 10:08 PM   #9
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Quote:
Originally Posted by aloysius
I'd be running a Sram pg-950; that's compatible with shimano road stuff, right?
Yes (as long as you're getting the 11-26 or 12-26 PG-950, and not the 11-32 or 11-34; those would require a MTB rear derailer). The hub/cassette spline pattern is the same for MTB and Road.
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