Rear derailleur hard downshifting- Mtbr.com
Results 1 to 6 of 6
  1. #1
    mtbr member
    Reputation:
    Join Date
    Mar 2020
    Posts
    19

    Rear derailleur hard downshifting

    Hi, i have a Shimano Deore XT M8000 GS rear derailleur and I have a problem when it comes to downshifting (from big sprocket to the small sprocket). Upshifting is smooth but when I downshift it jumps down, meaning that it doesnt have a smooth transition, it doesnt skip any gears and it downshifts to all the gears, the only problem is that when it does it jumps and doesnt have a smooth transition.

    Any help on how I can fix this?

    Thanks

  2. #2
    mtbr member
    Reputation:
    Join Date
    Aug 2019
    Posts
    497
    Have you checked you b-screw adjustment?

  3. #3
    mtbr member
    Reputation:
    Join Date
    Mar 2020
    Posts
    19
    No i haven't, would tgat fix the problem?

  4. #4
    mtbr member
    Reputation: Lone Rager's Avatar
    Join Date
    Dec 2013
    Posts
    8,762
    FWIW: Going from a big cog to small cog is up shifting, meaning going to a higher harder gear. Going from a small to a larger cog is downshifting, meaning going to a lower easier gear.

    It's very common for the chain to drop suddenly into a smaller cog when up shifting. It's normal.
    What, me worry?

  5. #5
    mtbr member
    Reputation:
    Join Date
    Aug 2019
    Posts
    497
    Quote Originally Posted by digijl View Post
    No i haven't, would tgat fix the problem?
    It might help if there's some hesitation with shifting ie slow to shift gears. When in a gear, does the chain rattle a little or does it sound clean? If there's rattling, it could be your cable tension needs adjusting. Mount the bike on stand or flip the bike over, look directly behind the cassette and work the pedal. Note if the chain is rubbing up against the adjacent bigger sprocket. If it is, back off the cable tension at the barrel-adjuster by the shifter.

    Have a read here about the B-tension screw and what it's for and see if this applies to your situation.

    https://bikerumor.com/2017/09/29/aas...derailleur-do/

  6. #6
    Slower But Faster
    Reputation: BrentD's Avatar
    Join Date
    Jul 2006
    Posts
    620
    Quote Originally Posted by Trinimon View Post
    Have you checked you b-screw adjustment?
    Also check that the B pivot is moving freely. They can get full of crud over time and get a bit sticky. It's an easy fix that you can do yourself with simple tools to clean and relube it.

Similar Threads

  1. Tight downshifting into larger rear cogs
    By richj8990 in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 5
    Last Post: 12-27-2017, 05:16 PM
  2. SRAM X7 not downshifting correctly.
    By sput360 in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 2
    Last Post: 05-07-2013, 08:23 PM
  3. x7 front not downshifting
    By fastale in forum SRAM
    Replies: 0
    Last Post: 08-05-2012, 08:30 PM
  4. XTR downshifting up to 4 times per push.
    By GotoDengo in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 1
    Last Post: 04-25-2011, 05:45 AM
  5. e-type front derailleur, downshifting issue, do they work w/ triple ring up front?
    By mmatador22 in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 7
    Last Post: 09-08-2008, 07:57 AM

Members who have read this thread: 24

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

THE SITE

ABOUT MTBR

VISIT US AT

© Copyright 2020 VerticalScope Inc. All rights reserved.