Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: will these pulleys work on an Ultegra derailer 9 spd?
Document: My original pulleys were worn out, and these will work perfectly. Fully recommended if you are a sram drivetrain user.
Top pulley is not the offset bushing style, that the Sram 2008 X.9 derailleur, comes with. This kit's pulley comes with two through the center hole pulleys. They are of good quality.
These pulleys are original equipment on late model SRAM X.9 (and other) derailleurs. Mine is the 2011 model, with one center hole (as illustrated). They were fairly easy to replace, but be aware that the two bolts that serve as axles are different lengths, and not interchangeable. As I recall, the longer one is the top one. I have not tried any of the aluminum jockey wheels, nor the ceramic bearing versions, so I cannot offer a comparison.
Confirmed fit on 2011 X.9 11T.During routine maintenance, I noticed my lower derailleur pulley was broken (cracked). Although the bike still rides well, the part will leave you stranded if it breaks on the trail. I'd rate these SRAM pulleys 3 stars. Heres why... These are on 1 of the 3 bikes I own. I've only put 500 miles on them before one failed. The design is weak and the pulley that failed is roughly 2 yrs old.
Awesome, have to go ride and make sure they withstand the work ethic that is snow and mud of the northeast.
great fit and it works well on my bicycle ! 2008 x.9 rear derailleur pulley on my Specialized stumpjumper fsr
As advertised fit my x 9 derailleur just fine no problems sent on time price was good no need to ask any questions. Use them for good service and price.
Much cheaper than replacing a deraileur! After replacing the pulleys on my old X9 deraileur it shifts like new. Bearings make them quite smooth.
My original equipment x9 derailleur pulleys had become ninja throwing stars from wear so I slapped a set of the same back on. They only last about a season for me, but I ride 3x a week or so in nasty conditions. There were a bunch of aluminum options with fancy bearings I considered but I tend to wear our a derailleur over a couple of seasons from hard use so I treat pulleys as a wear item.
... this pulley set, a direct replacement for the same, on the "Sram X.7" eight speed rear derailleur.IMPORTANT NOTE: the bolts (axels) for mounting these pulleys are NOT included; don't loose the original parts.replacement: of 'these' parts not all that difficult, HOWEVER, breaking the 'chain', and removing the derailleur from its hanger, makes life a lot easier. there no need to do anything with the shifter cable.the bolts, are of "different" lengths.
Answer: yes