Use existing or new derailleur?
Results 1 to 3 of 3
  1. #1
    RoadBikeReview Member
    Reputation: rochrunner's Avatar
    Join Date
    Jul 2006
    Posts
    461

    Use existing or new derailleur?

    When I bought an 11-34 cassette to use with my existing RD-5800 derailleur, all I was paying attention to was the chain capacity, and I'm good on that score. But I neglected the "max sprocket" spec, which for the RD-5800 is 32 teeth. From what I understand, the 34-tooth will work with some adjustment of the B-screw, but that could compromise the general shift quality. As an older, non-aggressive rider, I might not even notice although I tend to be fussy about things working right.

    The alternative is to get a newer-model RD-7000-GS (only $50), which looks like a straight replacement and has a max spec of 11-34.

    Any opinions on which way to go? I suppose I could always go with my current derailleur and, if I decide it's not working well enough, make the change at that time.

  2. #2
    tlg
    tlg is offline
    RoadBikeReview Member
    Reputation: tlg's Avatar
    Join Date
    May 2011
    Posts
    15,150
    Quote Originally Posted by rochrunner View Post
    I suppose I could always go with my current derailleur and, if I decide it's not working well enough, make the change at that time.
    Yes that's what you should do.
    Custom Di2 & Garmin/GoPro mounts 2013 SuperSix EVO Hi-MOD Team * 2004 Klein Aura V

  3. #3
    Matnlely Dregaend
    Reputation: DrSmile's Avatar
    Join Date
    Jul 2006
    Posts
    4,731
    B screw adjustments can make a big difference depending on the frame and hanger design, not just the cassette. If the top pulley touches the cog with the screw fully in it's not going to work. I wouldn't worry about 2 extra teeth though, it's very likely to work just fine.
    “Bicycling has done more to emancipate women than anything else in the world.” - Susan B. Anthony 1896
    "Cycling and ethical bankruptcy have always gone together." - Bike Snob NYC
    "White personifies this generation's obsession with superficiality, one in which a carefully curated social media post is more important than the actual ride" - Daimeon Shanks
    "I haven't %^&* like that since I was an altar boy" Hank Moody

Similar Threads

  1. Replies: 4
    Last Post: 05-05-2017, 08:25 AM
  2. Ultegra Triple upgrade - compatable with existing components?
    By davidbr93 in forum Components, Wrenching
    Replies: 5
    Last Post: 08-24-2011, 06:24 PM
  3. Replies: 14
    Last Post: 02-12-2009, 09:19 AM
  4. Co-existing with vehicles and their drivers
    By Gnarly 928 in forum General Cycling Discussion
    Replies: 15
    Last Post: 09-12-2006, 06:45 AM
  5. Trying to install existing brake cable on cane creek tt 200 levers
    By ravenmore in forum Components, Wrenching
    Replies: 5
    Last Post: 11-17-2005, 07:23 AM

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 ROADBIKEREVIEW

VISIT US AT

© Copyright 2019 VerticalScope Inc. All rights reserved.