cure for chain suck
#1
Member
Thread Starter
Join Date: Jun 2010
Posts: 32
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
cure for chain suck
Hi,
I have all new components, but on every ride I get chain suck: the chain runs back over on itself and gets jammed in the front derailleur and/or part of the chain gets wedged between the small ring and the chain stay. I almost fell over once on a steep hill when the chain jammed. I barely managed to squirm my foot out of the cleat and get my foot down.
I soaked the chain in degreaser and relubed it, and the drive train was silent and felt slick, but I got chain suck again.
Thanks.
I have all new components, but on every ride I get chain suck: the chain runs back over on itself and gets jammed in the front derailleur and/or part of the chain gets wedged between the small ring and the chain stay. I almost fell over once on a steep hill when the chain jammed. I barely managed to squirm my foot out of the cleat and get my foot down.
I soaked the chain in degreaser and relubed it, and the drive train was silent and felt slick, but I got chain suck again.
Thanks.
#3
Mad bike riding scientist
Join Date: Nov 2004
Location: Denver, CO
Posts: 27,421
Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones
Mentioned: 153 Post(s)
Tagged: 1 Thread(s)
Quoted: 6249 Post(s)
Liked 4,272 Times
in
2,393 Posts
It's a damaged tooth on the inner chainring. Check for a tooth that is twisted or has a burr on it or is otherwise damaged.
__________________
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
#4
Senior Member
Join Date: Feb 2005
Location: Oklahoma
Posts: 9,438
Bikes: Trek 5500, Colnago C-50
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 7 Times
in
6 Posts
A tight link can definitely cause chain suck. The chain can ride up the back side of the chainring instead of releasing in a flat path. When a tight link hits the rear derailleur and fails to go through the RD can be twisted right off the bike. It happened to a friend's new Trek, the dropout plate was twisted out of the chainstay requiring a trip back to the Trek factory.
#8
Mad bike riding scientist
Join Date: Nov 2004
Location: Denver, CO
Posts: 27,421
Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones
Mentioned: 153 Post(s)
Tagged: 1 Thread(s)
Quoted: 6249 Post(s)
Liked 4,272 Times
in
2,393 Posts
A burr or damaged tooth, on the other hand, engages the chain quite readily but won't disengage so that the chain is carried up into the chainstay.
This is not 'chain suck' in the classic sense.
__________________
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
#9
Senior Member
Join Date: Feb 2005
Location: Oklahoma
Posts: 9,438
Bikes: Trek 5500, Colnago C-50
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 7 Times
in
6 Posts
Chainsuck by definition is when the chain gets sucked up the back side of a chainring. Of course this can happen from a bent tooth, but it happens more often from a tight link in the chain, usually at the pin where the chain was joined.
#10
Elitist Troglodyte
Join Date: Jun 2006
Location: Dallas
Posts: 6,925
Bikes: 03 Raleigh Professional (steel)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
__________________
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
#11
smitten by саша
Join Date: Sep 2008
Location: Eugene, OR
Posts: 523
Bikes: Salsa La Cruz with Rohloff; mutt parts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
The most obvious solution is to eradicate cross-chaining, since a stiff link will still function (albeit not optimally) without coming off—given a perfect chain line.
#12
Banned
Used to be a great widget that fitted under the chainstay and filled in the gap between there and all 3 chainrings , so the Suck had no where to go.
chain minders inside and outside disc chainguards are nice things..
chain minders inside and outside disc chainguards are nice things..
#13
Mad bike riding scientist
Join Date: Nov 2004
Location: Denver, CO
Posts: 27,421
Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones
Mentioned: 153 Post(s)
Tagged: 1 Thread(s)
Quoted: 6249 Post(s)
Liked 4,272 Times
in
2,393 Posts
helpless describes a classic mountain bike chainsuck situation...high torque, steep hill, using the inner ring. Every single one of those I've ever experienced has been because of a damaged chainwheel caused by a previous botched shift.
__________________
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Last edited by cyccommute; 06-24-10 at 07:53 AM.
#14
Listen to me
Join Date: Nov 2004
Location: Lexus Texas
Posts: 2,788
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I've seen it many times on worn out rings (from running an old chain). As the teeth wear they produce a burr.
Run a file along the rings to clear any burrs.
Enjoy
#15
Real Men Ride Ordinaries
Join Date: Sep 2008
Posts: 3,723
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Likes: 0
Liked 3 Times
in
3 Posts
It's likely either a damaged inner chainring, or simply worn components. Either way, replacing the inner chainring and chain should hopefully solve your problem. When you do it, take a look around the bottom bracket shell to make sure it didn't cause any damage.
#16
Senior Member
Join Date: May 2008
Posts: 68
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Make sure your chain is not too long, and try not to shift in the front when you're cross chaining. Better yet, don't cross chain. If you have a new rear derailleur, then the spring should be more than strong enough to take up the extra when downshifting on a nominally-sized chain. It should be just long enough to shift into big-big (aka 1-3 or "stupid gear"). Any longer and chain suck can become an issue with a triple crank.
#17
Banned.
Join Date: Sep 2007
Location: Carlsbad, CA
Posts: 6,434
Bikes: '09 Felt F55, '84 Masi Cran Criterium, (2)'86 Schwinn Pelotons, '86 Look Equippe Hinault, '09 Globe Live 3 (dogtaxi), '94 Greg Lemond, '99 GT Pulse Kinesis
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 389 Post(s)
Liked 270 Times
in
153 Posts
#18
Senior Member
Join Date: Aug 2004
Posts: 736
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
The main cause of chainsuck is insufficient chain tension - one of the RD's job is to maintain enough tension to avoid letting the chain get pulled up in the front. Bent teeth, stiff links etc will be contributors (as well as net results), but at the start most of the issues are caused by low chain tension - which explains why it almost always happen when you're close to the small-small cross-chain combo. And of course it's much more frequent on mountain bikes because the chain has to accomodate larger gear differences, and the banging around coming from the terrain will already want to throw the chain all over the place.
So:
1. Ensure your chain is sized correctly - not too long
2. Ensure your RD is tensioning the chain correctly (beware of beat-up RDs with weak springs)
3. Don't crosschain in the small chainring, specially on rough terrain.
So:
1. Ensure your chain is sized correctly - not too long
2. Ensure your RD is tensioning the chain correctly (beware of beat-up RDs with weak springs)
3. Don't crosschain in the small chainring, specially on rough terrain.
#19
SkinnyStrong
Join Date: May 2010
Location: Austin, Tejas
Posts: 1,169
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
I just wanted to bring this thread back to say that in my case, it is most likely burr on one of the teeth of the big ring. After reading this thread to find out why my bike has started having this problem all of a sudden, I went over and checked my front chain ring. There are a few teeth on the big ring, just behind the crank arm, that have some significant burrs on them . I don't have a file to deal with the problem right now, but I'll take it in or go buy a file.
Thanks.
Thanks.
#20
Senior Member
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 9,548
Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1530 Post(s)
Liked 718 Times
in
510 Posts
You can also take the burrs off with a sharp knife.