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Dura Ace R. Der. 26t max?(16 posts)

Dura Ace R. Der. 26t max?opencl
Jul 7, 2002 7:26 PM
I brought a Dura Ace rear derailleur and the manual says the largest sprocket that it can accomodate is 26 teeth. The Shimano website says the max is 27t. What is the deal? Has anyone tried using this rear derailleur with a 12-27 cassette without problems?
works like a charm with a 12-27 (nm)Jekyll
Jul 7, 2002 8:40 PM
A 12-27 works fine, make sure your chain has enough links nmPaul
Jul 8, 2002 3:49 AM
I have a 12-27 rear ... no worries. nmjtolleson
Jul 8, 2002 6:11 AM
and your rear der. is specific for 26t or less?opencl
Jul 8, 2002 7:58 AM
Just curious, why is this particular one for 26t or less? Is it from a different year? Shimano does some funny things at times...
The standard 7700SS (the same one they have made for years)Jekyll
Jul 8, 2002 9:08 AM
On their web site they do state that the rear derailleur (for double set up - until pretty recently the only D/A rear derailleur) will accommodate up to 27t ( http://bike.shimano.com/road/dura-ace/ComponentTemplate.asp?partnumber=RD-7700-SS ).
If you pull the PDF with the instruction sheet it says 26t ( http://www.shimano-europe.com/cycling/phpimages/productserie/service_pdf/5TJ1D.pdf ) - either way - the regular 7700 SS D/A derailleur works just fine with a 12-27 cassette - to the best of my knowledge the 7700 (now SS) has not changed in years. The only change has been the addition of the long cage version (7700GS) for use with the triple.
Shimano brochure states max 26t for Dura Ace, but itPaul
Jul 8, 2002 9:15 AM
is able to handle the 27t cog. I was surprised when Dura Ace came out with the 12-27 cause of what they stated in the brochure. Just probably a cautious design statement is my guess. Campy for their 29t cog has a longer cage.
re: Dura Ace R. Der. 26t max?Banky
Jul 8, 2002 8:55 AM
Shimano make a D Ace 12-27 so it only makes sense that the rear deailleur should work. you may need a new chain though.
re: Dura Ace R. Der. 26t max?LC
Jul 8, 2002 10:26 AM
It seems that the new ones are rated to 26T max according to the instructions that came with it and sure enough I could not get a 27 cog to engage without the lower pulley hitting the 27 cog. Same story with a friends bike, so it is not just something weird about my bike.
dunno, butjtolleson
Jul 8, 2002 10:30 AM
I have the 7700ss r derailleur and use the 27 cog with some regularity (in a 39/27 combo... hey this is Colorado) and have never had any issues.
re: Dura Ace R. Der. 26t max?Chen2
Jul 8, 2002 10:37 AM
Have you tried adjusting the "B" screw for more clearance. I have no problem running a 27 cog.
~Al
Like Chen2 stated, it's the B screw.Paul
Jul 8, 2002 10:50 AM
And the B(body) screw will change the angle, and should give you the clearance. I had the same problem the first time. Not sure of the direction in my head, but just try going a couple of turns in one direction, and then the other if it still hits.
Doesn't clear by much.
Lets make this clear..opencl
Jul 8, 2002 10:48 AM
So there is one and only one 7700SS (regardless of the year)? I was thinking that maybe they changed the 7700ss design in 2002 to make it fit a 27-12..
yesJekyll
Jul 8, 2002 11:32 AM
The 7700 SS is the same 9sp they have made for years. The "SS" moniker was added last year to differentiate from the new long cage "GS" version that was introduced to work with triple set ups.
12 - 27 works (nm)Markus_B
Jul 8, 2002 11:05 AM
so no one has ever got D/A rear D with 27t max manual? nmopencl
Jul 8, 2002 4:00 PM
nm