Results 1 to 3 of 3
  1. #1
    mtbr member
    Reputation:
    Join Date
    Dec 2013
    Posts
    202

    Rear Derailer is touching 34T cog on 9th big gear. Would 8spd work? Also, a fork Q?

    I am building a 1994 Specialized Stumpjumper frame up with used parts from 2002+ Specialized Rockhopper and a Specialized Crosstrail and a Rockhopper A1 FSRXC.

    Currently installed are a Shimano Atlus FD-310 (48T max, 20T capacity) and a Shimano Deore LX RD-M581 Long Cage (45T capacity). (48-28=20) + (34-11=23) which equals 43.

    My cranks are Square Taper 44/32/22 with chewed up teeth and a decent Octalink 48/32/22. I can buy a 28 64mm small ring gear for the crank for around $8 CDN, to get it inline with RD capacity of 20.

    The wheels are aftermarket, but standard 9 speed. My 1994 Stumpjumper came with 7 speeds, so I think this is why my RD is catching on the big gear in the cassette. I already have the stem, headset, fork installed with the handlebars and quick-fire 9 speed shifters.

    Would a 8 speed cassette touch the RD?

    Also, the original front suspension fork on the 1994 Specialized Stumpjumper has quite a bit less height then my 2002+ suspension fork, it makes the top bar not level. Will this cause issue? its just a casual bike, with moderate trail riding.

  2. #2
    mtbr member
    Reputation:
    Join Date
    Jul 2008
    Posts
    1,035
    Did you adjust the B-tension screw?

    http://si.shimano.com/php/download.p...0A-002-ENG.pdf

  3. #3
    mtbr member
    Reputation: Eric Malcolm's Avatar
    Join Date
    Dec 2011
    Posts
    1,124
    7-8-9 speed, it makes no difference. The 34T will always be in the same place on the freewheel, next to the spokes. Remember, that it is the selector that alters the changing positions and this will therefore make difference to your problem.

    Adjust the B-screw as suggested. This is the screw above the setting pair of screws. By screwing it in, you will rotate the derailleur a little which should pull the pulley away from the teeth of the sprocket. Watch that you have the correct chain length, on the larger chain-wheel to the 34T, the system will be at full stretch, and on the smallest chain-wheel to smallest sprocket, the chain will be beginning to sag.

    Eric
    If I don't make an attempt, how will I know if it will work?

Similar Threads

  1. X9 9 speed rear der 2015- 8spd compat?
    By Molasses in forum SRAM
    Replies: 1
    Last Post: 03-21-2015, 09:24 AM
  2. Chainline front derailer touching chain
    By feno_uk in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 8
    Last Post: 03-10-2015, 03:49 PM
  3. Rear Derailer - Recommendations for 8spd
    By Scott Novak in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 6
    Last Post: 11-10-2013, 12:31 PM
  4. Alivio 8spd replacement shifters,will deore work
    By lolaralph in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 11
    Last Post: 09-03-2012, 10:11 PM
  5. Rear Derailer Won't Shift to Highest Gear
    By whos that guy in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 3
    Last Post: 03-27-2011, 08:18 PM

Members who have read this thread: 0

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 2019 VerticalScope Inc. All rights reserved.