Hey everyone, trying to install a new Deore rear derailleur on a 90’s trek multitrack and having issues with the rear derailleur top pulley wheel not being in the right place. Whenever I’ve done this I’ve simply screwed the derailleur on, routed the chain through and had no problem. In case the issue isn’t obvious, I’m considering the following info may be helpful:
This derailleur and chain isn’t technically new, I installed it on a nearly identical bike then swapped it to this one. Same size bike and I measured from crank to rear dropout was the same, so assumed the chain would be the same. TIA!
by joeypersYNWA
5 Comments
Also checked the size of the chain by putting it on largest rear cog and only front cog, then added a link. Old bike this exact setup was installed on rode perfectly for less than 50 miles before I found this better frame. Also, the older bike only had 26” wheels vs 700c on this one, but like I said the distance from rear dropout to crank was identical
Picture of rubbing please.
You have the B-link wrong..it’s supposed to be horizontal. That will give some torsional preload to the B-tension screw and pull the pulley away from the chainstay.
ETA a marked-up copy of the dealer service manual available on Shimano’s website:
https://preview.redd.it/xphcsws153tc1.jpeg?width=1157&format=pjpg&auto=webp&s=36de01e43126d4a4a3089d09c2aa82e42c0ede11
UPDATE: B screw too loose. Had to tighten the b screw as far as possible to get the guide pulley to drop down into an acceptable position to shift into every gear. Why Shimano makes this the last step of the puzzle AFTER asking to shift into the large cog? I don’t know, my guess is that the B screw comes tight from the factory and I loosened it for some reason so they wouldn’t expect this level of stupidity
Final update thank you so much to u/cargopile1314 u/greatfulMu u/kris0r for the help and my apologies for not listening at first. Had a wind storm last night and my power is out so I posted this then my phone died and did some troubleshooting but now I’m back and have correctly installed the rear derailleur with the little nub pressuring the corresponding nub on the frame near the mounting point. Will now re-adjust rear derailleur again and get riding!