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rear derailluier for triple cranks

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rear derailluier for triple cranks

Old 11-03-07, 04:24 AM
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stevegor
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rear derailluier for triple cranks

Hi,
I'm hoping to install an Ultegra triple crankset 52/42/30 to a road bike and I'll being using a 9 speed 11-23 cassette with a short cage Ultegra rear derailluier, a LBS told me that I would need to use a long cage or at least a mid range....Is this right?, because reading Sheldon Brown's info tells me a short cage would be OK...what do you guys think??
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Old 11-03-07, 04:50 AM
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You will need a derailleur with a total capacity of 34 teeth.
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Old 11-03-07, 06:12 AM
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Originally Posted by maddmaxx View Post
You will need a derailleur with a total capacity of 34 teeth.
You don't "need" to have a derailleur with the capacity for 34 teeth, but you need to limit the gear combinations you use to the actual capacity of the derailleur you use.

If you use a short cage derailleur you will have to avoid the small chainring/small cog (or smallest two cogs) combinations so the chain doesn't go slack. This is not a problem from a gearing choice standpoint and, if you happen to use them accidently, the chain will go slack but no damage will occur.
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Old 11-03-07, 07:00 AM
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Originally Posted by HillRider View Post
You don't "need" to have a derailleur with the capacity for 34 teeth, but you need to limit the gear combinations you use to the actual capacity of the derailleur you use.

If you use a short cage derailleur you will have to avoid the small chainring/small cog (or smallest two cogs) combinations so the chain doesn't go slack. This is not a problem from a gearing choice standpoint and, if you happen to use them accidently, the chain will go slack but no damage will occur.
Edit:.......................you will need to have a derailleur with the capacity for 34 teeth to do it properly. That's why they make road triple rear derailleurs. That way you won't have to worry about your chain going slack, jumping off the small chainring, binding between the inside of the crank and the frame and chewing the paint and outer aluminium from the frame. But if you will never shift the wrong way by accident or use the unusable gears you will be able to cobble together the thing with a rear double

Why do the job halfway?
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Old 11-03-07, 07:04 AM
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Originally Posted by maddmaxx View Post
Edit:.......................you will need to have a derailleur with the capacity for 34 teeth to do it properly.
Exactly right.

Originally Posted by maddmaxx View Post
Why do the job halfway?
Easy answer; money.
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