Timberjack chainstay gouging- Mtbr.com
Results 1 to 11 of 11
  1. #1
    Back of the pack fat guy
    Reputation:
    Join Date
    Jan 2004
    Posts
    3,998

    Timberjack chainstay gouging

    Is this happening to anybody else's Timberjack? I noticed it after the first ride or two and It's getting worse the more I ride. I've never laid the bike down or bashed it or otherwise damaged it. Other frames I've owned have a protector in that spot (see photo of an Evil The Following), but the TJ does not. Seems to be a manufacturing or design defect.
    Attached Thumbnails Attached Thumbnails Timberjack chainstay gouging-59123944743-14c7dbf9-0917-4b42-9cdd-f73ca505705b.jpg  

    Timberjack chainstay gouging-img-3270.jpg  


  2. #2
    since 4/10/2009
    Reputation: Harold's Avatar
    Join Date
    Dec 2003
    Posts
    27,245
    is the gouging occurring on the top or bottom of the chainstay?

    Whichever side that is, it's the chain that's causing it, and it's not a defect. it's usually caused by chainsuck, which is often related to maintenance.

  3. #3
    Back of the pack fat guy
    Reputation:
    Join Date
    Jan 2004
    Posts
    3,998
    Its on the outside of the chainstay. (Stupid MTBR uploading tool always rotates pictures.) I've never had chainsuck on this bike. I clean and lube the chain before every ride. The clutch XT rear derailleur is properly adjusted and the bike was purchased in April of this year, so the chain and chainring are almost new. Not maintenance related.

    Hmm. Is anyone is using a 50t largest rear ring on their cassette? I'm wondering if that's the problem.

  4. #4
    since 4/10/2009
    Reputation: Harold's Avatar
    Join Date
    Dec 2003
    Posts
    27,245
    yes, it's obviously the outside. I asked top or bottom. which direction in the photo points towards the top of the bike? It's relevant.

    It is the chain. there's not really anything else it can be. It's not the chainring because it's too far away. The top or bottom makes it relevant and can help diagnose the cause. chainsuck isn't always caused by drivetrain maintenance. but it usually is. Maybe it's chain SLAP instead. or, maybe there's excess drag in your freehub, resulting in slack on the chain when you coast or ratchet the pedals, and that slack gets jammed between the chainring and the frame (some will call this chainsuck, too).

  5. #5
    Back of the pack fat guy
    Reputation:
    Join Date
    Jan 2004
    Posts
    3,998
    Quote Originally Posted by Harold View Post
    yes, it's obviously the outside. I asked top or bottom. which direction in the photo points towards the top of the bike? It's relevant.

    It is the chain. there's not really anything else it can be. It's not the chainring because it's too far away. The top or bottom makes it relevant and can help diagnose the cause. chainsuck isn't always caused by drivetrain maintenance. but it usually is. Maybe it's chain SLAP instead. or, maybe there's excess drag in your freehub, resulting in slack on the chain when you coast or ratchet the pedals, and that slack gets jammed between the chainring and the frame (some will call this chainsuck, too).
    Yeah, well, blame MTBR for their stupid photo hosting feature. Kinda top of the chainstay, but really more on the side of the chainstay than the top.

    I've had two sets of wheels with different hubs and this gouging was happening with both hubs. No hub drag I can feel on either. I've never felt the chain get jammed or stuck either pedaling or coasting. With the clutch derailleur, the chain is pretty tight through all gears and I can't hear or feel slap.

    It's a mystery, wrapped in an enigma, in a big ol' puzzle box.

  6. #6
    since 4/10/2009
    Reputation: Harold's Avatar
    Join Date
    Dec 2003
    Posts
    27,245
    Not so much of an enigma, TBH. The clutch on the RD mostly just helps with chain slap on the underside. It does a little for slap issues on the top run of chain, but it doesn't do so much there. When you're pedaling, the top run is under tension, anyway, and not so likely to flop around. When coasting or backpedaling, it absolutely can and will get loose and floppy enough to slap the chainstays. Though frame designs have often been tweaked a bit to give a little more clearance between the frame and the chain. This floppy upper run of chain can happen especially if you've got some drag in the freehub or if you've got a stiff link in the chain that hangs up somewhere in the derailleur. The hub drag doesn't have to be REALLY bad for this to happen, FWIW. It can be subtle. Pedal the bike up to a pretty high speed in a workstand and just let the whole thing coast. Do the cranks "auto pedal" when you let go of the pedal? You've got some drag. Ride over some bumps when this is relaxing the upper run of chain, and it'll hit the frame. If the chain fits REALLY snug (especially if there's some mud/dirt buildup), pedaling a little backwards can cause a bit of backwards chain suck.

    If you know someone with a GoPro, you can clamp the camera back there and record video of this happening.

  7. #7
    mtbr member
    Reputation: the_joe's Avatar
    Join Date
    Feb 2017
    Posts
    1,256
    Yes and mine is way worse than that. The piece of $h1t Praxis crank/chainring that came on the bike cause chainsuck like i have never seen before. Switched to rotor crank and chainring and no more chainsuck.
    My name is George. Iím unemployed and I live with my parents.
    2017 BMC Speedfox 25-622 ISO
    2017 Salsa Timberjack 40-584 ISO

  8. #8
    mtbr member
    Reputation:
    Join Date
    Apr 2004
    Posts
    1,391
    I'd guess that you backpedaled once or twice and the chain -- for whatever reason -- was semi-stuck to the chainring. @Harold is correct that nothing else but the chain could reach that spot. A 50T cog, especially if it overhangs the frreehub, could potentially contribute to a severe chainline that would increase chances that the chain sticks on the chainring when backpedalling.
    I wouldn't worry about it. Its a small cosmetic flaw on the solid aluminum yoke (ie, no hollow center to rub thru to). Virtually no aluminum frames use the protectors that you are referencing . . . they are almost exclusively on carbon bikes, because carbon has far less abrasion resistance than most metals.
    If you upgraded to the 50T cog versus stock, did you install a new chain? Because going from 46T to 50T, for example, would require two links of additional length to maintain the same chain length/tension.

  9. #9
    mtbr member
    Reputation:
    Join Date
    Feb 2018
    Posts
    275
    Whatever it is causing it, it's just cosmetic. Had the same thing happen to my '18 TJ. I just cleaned the area up, and the put some gorilla tape over the area to protect it. Problem solved. Would be nice if Salsa would've put a decent chainstay protector on the bike for issues such as this, but since they didn't, black gorilla tape on the top of pretty much the entire chainstay works just fine for me.

  10. #10
    mtbr member
    Reputation: Darth Lefty's Avatar
    Join Date
    Sep 2014
    Posts
    1,269
    Not a thing on my NX 11-speed

  11. #11
    mtbr member
    Reputation: richardjohnson's Avatar
    Join Date
    Sep 2016
    Posts
    117
    Quote Originally Posted by the_joe View Post
    Yes and mine is way worse than that. The piece of $h1t Praxis crank/chainring that came on the bike cause chainsuck like i have never seen before. Switched to rotor crank and chainring and no more chainsuck.
    I have praxis cranks and chainrings on my gravel bike and it does chainstuck. Was thinking it was my poor chain maintenance but maybe praxis is the thing.
    I like your bike

Similar Threads

  1. Replies: 6
    Last Post: 04-10-2019, 10:47 PM
  2. protecting freehub from cassette gouging?
    By Gabe3 in forum Wheels and Tires
    Replies: 7
    Last Post: 03-31-2012, 09:07 PM
  3. Russian River responds to Younger price gouging
    By JFryauff in forum Beer Forum
    Replies: 11
    Last Post: 03-05-2012, 08:52 PM
  4. rear wheel gouging scalpel chainstay
    By todo in forum Cannondale
    Replies: 5
    Last Post: 10-02-2008, 01:59 PM
  5. Front deraileur gouging chainstay on 06 Colier D
    By Xam in forum Downhill - Freeride
    Replies: 5
    Last Post: 07-27-2006, 11:57 PM

Members who have read this thread: 42

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.