Has anyone used a 50/34 crank with a 12-27 cassette with a short cage Derailleur on a road bike?

Hi

I currently have a 12-25 cassette and have a chance to buy a 12-27 cassette. Some websites say I can use a 27 without problems and some say I will have problems.

Just wondering if any AC members have any personal experience with this combo???

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Permalink Reply by David Case on May 25, 2012 at 0:26

Hi Paul. The S-Works Roubaix SL Dura-Ace 2007 uses this cassette with a short cage and compact cranks. I have not experienced any problems with this setup. I find it easier than on my previous bike with 53/42 and 12 /23 cassette.

Permalink Reply by rossmg on May 25, 2012 at 1:52

My Giant Cadex is running that combo with a short cage rear derailleur - works fine. I had to lenghten the chain by 1 link which was easy done.

Permalink Reply by Gary Mills on May 25, 2012 at 8:40

Yes, it will work without any trouble. In fact you should be able to go to 28T which I have fitted to several bikes running 105 and Ultegra.  Which rear derailleur do you have?

Permalink Reply by Paul S (Maximus) on May 25, 2012 at 16:25

105, but will soon upgrade to a dark grey ultegra to match the cranks.

Permalink Reply by simon on May 25, 2012 at 8:53

if you're running dura ace, 12-27 is the largest big tooth, and largest big-to-small gap that shimano recommend. but it will work perfect. on my 105 bike i ran 50/34 and 11-28 with zero issues.

Permalink Reply by Matt Jones on May 25, 2012 at 9:50

Was running a 50-34 with an 11-28 no issues on my Cannondale and Ultegra Derailleur

A mate was running 50-34 with 12-27 on a BMC with 105 no issues, changed it to a 11-28 still no issues.

Permalink Reply by Terry C on May 25, 2012 at 9:53

I use this cassette with standard 52/39 chain rings, and short cage Ultegra derailliuer with no problems. Shimano's recommendations assume that you will be using the extreme cross-over gears, which should be avoided anyway.   

Permalink Reply by Jason Wellington on May 25, 2012 at 10:02
I have run 50/34 and 11-28 on both Ultegra and SRAM Rival group sets. In both cases this was supplied directly by the dealer.
Permalink Reply by Tim B on May 25, 2012 at 11:06

Is chain length an issue when stepping up an extra couple of teeth?

Permalink Reply by Terry C on May 25, 2012 at 11:21

I went from 25 to 27T with no change in chain length.

Permalink Reply by Matt Jones on May 25, 2012 at 11:31

Chain length would only be an issue if its been adjusted too short when in the big ring / little cog position.

Permalink Reply by Terry C on May 25, 2012 at 11:37

If the chain length is OK from the big ring to the second last rear sprocket, it will certainly be OK from the small ring to the 27T

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