20 Most Recent Shimano 09 Xtr M971lc Mountain Bike Rear Derailleur Questions & Answers

You asked about releasing the rear brake but posted a picture of the rear derailleur. Clarification would be very helpful.

Web search "how to shift gears on a bike" for the procedure.

Then" derailleur adjustment" for the mechanics of it.

Good place to start for repairs...
http://www.parktool.com/blog/repair-help/categories/derailleur-systems

Any search engine would take "remove rear bicycle tire" and produce many good answers. Involvement of Fixya experts is an unnecessary and delaying step.

http://techdocs.shimano.com/techdocs/index.jsp

enter "M971" in the FIND field to find exploded views and instructions

start here:
http://parktool.com/repair/byregion.asp?catid=53

Make sure your rear derailleur is lined up with one of the rings of teeth on your rear gears( cassette ). Also make sure Your chain is riding correctly on one of the front gears on your crank. If you are still unable to back pedal make sure that one of the cogs (gears) in the rear derailleur arm isn't seized. They must both be able to rotate and the chain should pass through them in a backward S pattern. If you still can't back pedal remove the back wheel or move the chain off the cassette to see if the cassette will freewheel. It has to move freely in a counterclockwise direction in order for you to backpedal. Moving in a clockwise direction engages pawls inside the cassette which lock it into a drive situation which propels the bike. If the cassette will not freewheel in a counterclockwise direction you will need to take the rear wheel to a good bicycle shop to have the cassette replaced. It requires a special tool to remove it. Hope this helps.

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I finished changing the cable of Shimano Deore XT SL-M740. Unfortunately it did not have the plastic screw hiding the chunk of lead at the end of the cable. I mean that there is no hole from which the cable can be pulled out. Therefore, I removed the front panel where you see "Simano Deore", but this panel only removed the shift position indicator and the internal mechanism was covered by another metal sheet. To change the cable I had to remove the small cover between the barrel adjuster and the lever. The cover is fastened by two very small screws. An encouraging sign was that one of these screws was missing. That indicated that a previous owner had removed the cover once. The cable end was attached to a component exactly like a brake cable is attached to a brake lever. This component pulls the cable around the shifter. The sift cable is not attached to the shift lever. The sift lever rotates the said component. The barrel adjuster had a slot to put the cable inside. Therefore, attaching the cable to the above component was easy. When the cover was installed, I attached the small screw to the end of a driver with silicon paste. Someone suggested to use grease, but grease is messy.

https://www.google.com will give search results for online sales. Example: https://www.google.com/search?q=shimano+st-m290+shifter&source=lnms&tbm=shop&sa=X&ved=2ahUKEwj_gsfx-qbqAhWCl3IEHeFNC3MQ_AUoAXoECA0QAw&biw=1440&bih=791&dpr=1.5 Ebay, and Alibaba sell shifters. Example: https://guide.alibaba.com/shopping-guides/shimano-acera-x-st-m290.html

I had a look at the Mongoose website. They have manual for download. https://int.mongoose.com/pages/product-manuals Enter the model of your bike, or look for a picture of it. Follow the instructions.... REgards Geoff

There is no "best" derailleur for any particular situation. Get one rated to handle the range, at a price you can afford, and that has good reviews. Performance is more affected by how well you set up derailleur and cables, as well as chain and condition of cassette, than by individual model differences.

Just Google "install Tiagra shift cable" and choose the instructions that work best for you.

These sites may prove of assistance. They include downloads for manuals: https://si.shimano.com/# https://bike.shimano.com/en-EU/components/road.html https://www.shimano-steps.com/e-bikes/north-america/en/service

Ok here you go. https://schematics.mikesreelrepair.com/albums/shimano/Shimano_Triton_TRN_200G_ARB_Schematic.pdf

what part of a bike is this for? have you tried this website : http://fishing.shimano.co.jp/fishing_info/reel_learning/ship_reel/pdf/manual_98_sls_kobune_1000ev_2000ev.pdf

what group set do you have? Have you looked on the Shimano website? They have a lot of useful information on there, including basic gear setuo details which will generally apply to all groupsets.

Could actually be both. Squirt a small amount of lubricant between the two paddles and shift one or the other multiple times to see if they free up. If not you made to take it to your local shop where the can disassemble the shifter to see if debris has lodged itself inside.

adjust the rpm on the governor lever screw

The only reason I can think of for needing that info is a broken or replacement chain. In either case one needs the proper tool and connecting link to size and install the chain. Do not do so without knowing the proper procedure. Find a bike co-op or bike shop locally to help, or a knowledgeable friend, or Google "install bike chain".