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PostPosted: Mon Jul 30, 2012 6:32 pm 
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That's the whole point. Will it have enough capacity to be able to accommodate the 53/29 situation. We all know you should never find yourself in that combination but it's nice to know that if it did occur (forgetfulness, carelessness, etc) that it isn't going to rip your derailleur apart and break the hanger and end up destroying who knows what else in the process.
I have installed and ridden a drive chain combo that would not be recommended, but in order to accommodate certain situations temporarily I just used caution in the range that could have caused problems. But I would never run a combo that even allows the possibility of crossing the big ring with the big sprocket without enough capacity in both gain length and the derailleur.
The new 11speed derailleur has one cage than accommodate (providing chain length is correct) any combination of cassettes from 11/23 to 12/29 which is nice. The early generation 11speed derailleurs however require a slight modification and part swap to accommodate the 12/29. But the part is relatively cheap, like $15 or something.
But this thread is talking about 10speed capacity.

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Posted: Mon Jul 30, 2012 6:32 pm 


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PostPosted: Mon Jul 30, 2012 10:39 pm 
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Joined: Tue May 03, 2005 2:20 am
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Location: Belgium
Hi,

thisisatest wrote:
The medium cage is specifically designed for the 29t cassette. Actually should not be used w a cassette smaller than 26t. Its capacity is fully capable of handling the full range with a double, unlike the short cage which is a bit of a crapshoot when running the 29t.


The Record 10S medium cage derrie should and will run any cassette from 29T down without a glitch running a standard 39/53 crank.

The long cage should take all available cogs. The main reason it isn't used much is that it is slightly slower in responding to gear changes and of course it is heavier and less stiff. Other than that it also requires a longer chain which once again adds weight.

Ciao, ;)

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PostPosted: Tue Jul 31, 2012 4:25 am 
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Joined: Sat Jun 13, 2009 4:02 am
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Location: NoVA/DC
fdegrove wrote:
The Record 10S medium cage derrie should and will run any cassette from 29T down without a glitch running a standard 39/53 crank.

yup, it appears you are correct. i just reread an old campy catalog and it seems that, many moons ago, i misread what they were saying.


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PostPosted: Tue Jul 31, 2012 6:19 am 
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Location: New York
Properly set up gears should be fine. I have never ripped a rear derailleur as a result with the big ring and the biggest rear cog. I have done this on 8 9 and 10 speed. I'm just stating my experience here. You do not need to do the same.

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PostPosted: Tue Jul 31, 2012 4:45 pm 
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Durace but same concept on Wiggins bike

A 10 speed Shimano Dura Ace Di2 transmission with wide ratio cassette and longer cage rear mech for the mountains.

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