Shimano RD-TX70, RD-TX50, RD-TX30 - Rear Derailleur Manual

Installation of the rear derailleur

Chain length

Add 2 links (with the chain on both the largest sprocket and the largest chainring)

Cable securing and stroke adjustment

Place the outer casing so that it does not touch the basket and mudguard, otherwise it may cause a problem with the performance of the derailleur.

Set the outer casing (RD-TX70/RD-TX50) so that its length is as follows.

• If routing the casing upward:
  (The chain should be on the largest chainring and on the largest sprocket.)
  Add 10 mm to the length of the outer casing from the end that is inserted into the outer casing holder to the end which is inserted into the link.
  
• If routing the casing downward:
  (The chain should be on the largest chainring and on the largest sprocket.)
  Set the length of the outer casing so that it describes a smooth arc, and so that the link stops in a position where there is a small gap between the link and the link stop.
  

Connect the inner cable to the derailleur as shown in the illustration.

This service instruction explains how to use and maintain the Shimano bicycle parts which have been used on your new bicycle.
For any questions regarding your bicycle or other matters which are not related to Shimano parts, please contact the place of purchase or the bicycle manufacturer.

Top adjustment

Turn the top adjustment screw to adjust so that the guide pulley is below the outer line of the smallest sprocket when looking from the rear.

Connection and securing of cable

Connect the cable to the rear derailleur and, after taking up the initial slack in the cable, reattach to the rear derailleur as shown in the illustration. Secure the cable by pulling it with pliers with a force of 5 - 10 kg.

Low adjustment

Turn the low adjustment screw so that the guide pulley moves to a position directly below the largest sprocket.

How to use the B-tension adjustment screw

Mount the chain on the smallest chainring and the largest sprocket, and turn the crank arm backward. Then turn the to adjust the guide pulley as close to the sprocket as possible but not so close that it touches. Next, set the chain to the smallest sprocket and repeat the above to make sure that the pulley does not touch the sprocket.

SIS Adjustment

Operate the shifting lever several times to move the chain to the 2nd sprocket. Then, while pressing the lever just enough to take up the play in the lever, turn the crank arm.

For the best SIS performance, periodically lubricate all power-transmission parts.

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