After you have installed your rear derailleur on your mountain bike, there are some initial adjustments that need to be made that apply to all rear derailleurs…regardless of brand or type. The limit screws on your rear derailleur control how far your derailleur can move towards and away from your cassette.
There are independent adjustment screws for the low level and high level adjustments. Both Shimano and SRAM require the same positioning of the limit screws, but the location of their screws are different. Low Adjustment Screw — Adjust the low limit adjustment screw so that the upper pulley is in line center to center with the largest cog on the cassette.
Manually push the derailleur out with your hand and turn the crank arms until it stops to make this adjustment. You should feel the derailleur move back and forth as you change the positioning of the limit screw. When the limit screw is in the correct position, you should not hear any clicking from the chain as it rides from the cassette to the rear derailleur. High Adjustment Screw — Adjust the high limit adjustment screw so that the upper pulley is in line center to center with the smallest cog on the cassette outer most.
By letting go of the rear derailleur completely and turning the crank arms, the rear derailleur will sit at the point of the high adjustment screw. Make your adjustments and watch the derailleur move. When it is adjusted correctly, the chain will not click or skip in this position. Using the bolt on the rear of the rear derailleur, you need to adjust the gap between the top pulley of the derailleur and the bottom of the cassette on both the high and low end.
Make this adjustment by pushing the rear derailleur to the largest cog by hand. Adjust against the largest cog and double check on the smallest. In the Shimano instructions, they recommend you get the pulley as close to the cassette as you can. Be sure to check the distance from the cog on all points of the cassette as shown. After you have the rear derailleur on your mountain bike installed and initial adjustments completed, it is time to install the shifting cable and fine tune your shifting.
At this point, you mountain bike should be shifting pretty well with maybe a little delay or clicking between gears. Shimano makes a variety of bicycle parts, including the XT rear derailleur.
A rear derailleur is a spring-tension mechanism attached to the bike frame near the back wheel. It is part of the drivetrain and is necessary for your bike to shift gears. As you change gears using the shifter on your handlebars, the derailleur moves your chain to the corresponding cog on the cassette. When your gears fail to shift smoothly, it's a good idea to adjust the rear derailleur. Shift the derailleur down to the smallest cog on the chainring.
Turn the barrel adjuster clockwise to leave room for adjusting it later. The barrel adjuster is the small round knob connected to the cable. Locate the high limit screw. This is the upper screw across from the barrel adjuster. Use your screwdriver to rotate the screw. Rotating the screw clockwise moves the derailleur in; rotating counterclockwise adjusts the derailleur outward. For a good starting point, rotate the high limit screw to position the upper pulley directly beneath the smallest cog.
Loosen the cable anchor by unscrewing it slightly. The cable anchor is located at the bottom portion of the derailleur. Being out on the trail with your derailleur not shifting through the gears properly can be an aggravating thing. After reading this MTB How To , you should be an expert on how to install and set up your rear derailleur. Here we are going to be installing a Shimano XT M rear derailleur for a 1x11 drivetrain.
Installing a derailleur from Sram or Box Components follows a very similar method. To get the job done right, we are going to need the right set of tools. To install and set up a new rear derailleur, we are going to need a set of allen keys, a phillips screw driver, cable cutters, chain break tool or chain pliers, and a pair of pliers.
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