Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Crankset moves side to side upon every rotation!

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Crankset moves side to side upon every rotation!

Old 08-19-16, 06:35 AM
  #1  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Crankset moves side to side upon every rotation!

Every time I pedal the crankset moves in and out. This means that I can't adjust my front derailleur properly as the chain moves from side to side, hitting the derailleur at every rotation. There is no play in the bottom bracket, the crankset has been secured well to the BB by the crank bolts and the crankset is not bent in any way. What could be the cause of this problem? Thanks.
TonyN98 is offline  
Old 08-19-16, 06:43 AM
  #2  
Bike Gremlin
Bike Gremlin
 
Bike Gremlin's Avatar
 
Join Date: Nov 2010
Location: Novi Sad
Posts: 4,078

Bikes: Custom made on Scott Speedster frame, Custom made on a 1996. steel MTB frame (all but frame changed at least once in the past 20 years).

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 955 Post(s)
Liked 7 Times in 7 Posts
Probably bent chainring. Can be bent back to be more straight.

Bike Gremlin is offline  
Old 08-19-16, 06:45 AM
  #3  
Slash5
Senior Member
 
Join Date: Feb 2014
Location: Southern Ontario
Posts: 1,888
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 259 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
If everything you say is true then you have a broken frame. There are only so many elements to the interface and you have listed them all.
Slash5 is offline  
Old 08-19-16, 06:45 AM
  #4  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The chain rings are not bent. This occurs on both chain rings, any other possible problems? Thanks for your help though!
TonyN98 is offline  
Old 08-19-16, 06:46 AM
  #5  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
By "a broken frame" are you talking about the part where you thread in the BB?
TonyN98 is offline  
Old 08-19-16, 06:49 AM
  #6  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Let me add that the bike is new (ridden 70km) and this problem was there before it had been ridden fresh from the build.
TonyN98 is offline  
Old 08-19-16, 06:50 AM
  #7  
HillRider
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 31,918

Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!

Mentioned: 34 Post(s)
Tagged: 0 Thread(s)
Quoted: 1318 Post(s)
Likes: 0
Liked 145 Times in 119 Posts
Originally Posted by TonyN98 View Post
By "a broken frame" are you talking about the part where you thread in the BB?
Not necessarily the bottom bracket shell. A cracked frame tube, either the seat tube or down tube, could be the problem.
HillRider is offline  
Old 08-19-16, 06:56 AM
  #8  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks for the help, I'll do a check up on the frame.
TonyN98 is offline  
Old 08-19-16, 07:19 AM
  #9  
Slash5
Senior Member
 
Join Date: Feb 2014
Location: Southern Ontario
Posts: 1,888
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 259 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
I really doubt it's the frame, I was just being a smart ass. You've missed something in your checking. If you are sure everything is tight then it must either be a bent BB spindle or the crank spindle interface has been machined incorrectly.
Slash5 is offline  
Old 08-19-16, 07:29 AM
  #10  
Bike Gremlin
Bike Gremlin
 
Bike Gremlin's Avatar
 
Join Date: Nov 2010
Location: Novi Sad
Posts: 4,078

Bikes: Custom made on Scott Speedster frame, Custom made on a 1996. steel MTB frame (all but frame changed at least once in the past 20 years).

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 955 Post(s)
Liked 7 Times in 7 Posts
The crankset moves in and out parallel to the frame? The whole chainring, not just the top part moving out, while the bottom for example moves in, or remains in line?
Bike Gremlin is offline  
Old 08-19-16, 07:32 AM
  #11  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Ok, I removed the crankset and the BB, put them back on and tightened them well. The crankset doesn't seem to be moving from side to side when I rotate the crankset, but the same problem persists, the chain moves from side to side and hits the front derailleur. I will take a picture of the chain line and will upload a video to give you a clearer image.
TonyN98 is offline  
Old 08-19-16, 07:46 AM
  #12  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Here is the link to the video showing how the chain moves from side to side. I just uploaded it so may have to wait a while until full quality is reached. https://www.youtube.com/watch?v=3zcW...ature=youtu.be
TonyN98 is offline  
Old 08-19-16, 07:51 AM
  #13  
Bike Gremlin
Bike Gremlin
 
Bike Gremlin's Avatar
 
Join Date: Nov 2010
Location: Novi Sad
Posts: 4,078

Bikes: Custom made on Scott Speedster frame, Custom made on a 1996. steel MTB frame (all but frame changed at least once in the past 20 years).

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 955 Post(s)
Liked 7 Times in 7 Posts
Can't see it - says it's private.
Bike Gremlin is offline  
Old 08-19-16, 07:53 AM
  #14  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Sorry, here is an updated link
TonyN98 is offline  
Old 08-19-16, 08:04 AM
  #15  
NYMXer
Senior Member
 
NYMXer's Avatar
 
Join Date: Oct 2015
Location: Middletown NY
Posts: 1,495

Bikes: Cannondale SuperSix EVO w Hi-Mod frame, Raleigh Tamland 1 and Giant Anthem X

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 352 Post(s)
Likes: 0
Liked 1 Time in 1 Post
It looks like only the chain is bent, nothing else?
NYMXer is offline  
Old 08-19-16, 08:33 AM
  #16  
Bike Gremlin
Bike Gremlin
 
Bike Gremlin's Avatar
 
Join Date: Nov 2010
Location: Novi Sad
Posts: 4,078

Bikes: Custom made on Scott Speedster frame, Custom made on a 1996. steel MTB frame (all but frame changed at least once in the past 20 years).

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 955 Post(s)
Liked 7 Times in 7 Posts
Originally Posted by nymxer View Post
it looks like only the chain is bent, nothing else?
+1
Bike Gremlin is offline  
Old 08-19-16, 08:38 AM
  #17  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
That's how it looks like in the video, but I took off the chain and it is perfectly straight, but can bend quite a lot. This bending only occurs when the chain moves, and it appears this is now the problem, the crankset no longer moves left and right.
TonyN98 is offline  
Old 08-19-16, 08:52 AM
  #18  
trailangel
Senior Member
 
trailangel's Avatar
 
Join Date: Feb 2014
Location: Pasadena, CA
Posts: 3,990

Bikes: Schwinn Varsity

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 1466 Post(s)
Liked 167 Times in 109 Posts
All I can see is the whole bike moving side to side.
trailangel is offline  
Old 08-19-16, 08:54 AM
  #19  
NYMXer
Senior Member
 
NYMXer's Avatar
 
Join Date: Oct 2015
Location: Middletown NY
Posts: 1,495

Bikes: Cannondale SuperSix EVO w Hi-Mod frame, Raleigh Tamland 1 and Giant Anthem X

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 352 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by TonyN98 View Post
That's how it looks like in the video, but I took off the chain and it is perfectly straight, but can bend quite a lot. This bending only occurs when the chain moves, and it appears this is now the problem, the crankset no longer moves left and right.
Based on that video, your chain is bent. This is clear as you can see the bend when it is between the drive rings and rear cassette. Looks like maybe you shifted while under too much force and bent the chain, which is better than bending your cassette gears.
NYMXer is offline  
Old 08-19-16, 09:02 AM
  #20  
himespau 
Senior Member
 
himespau's Avatar
 
Join Date: Jun 2008
Location: Louisville, KY
Posts: 11,259
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 1808 Post(s)
Liked 210 Times in 148 Posts
I'd say see if putting a new chain on their solves the problem. It sure looks like one of your links is bent.
himespau is offline  
Old 08-19-16, 09:10 AM
  #21  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Ok thanks people, I will try putting on a new chain and seeing if that fixes the problem. I too do notice that there is a regular pattern in the way the chain is bent with every few rotations.
TonyN98 is offline  
Old 08-19-16, 09:23 AM
  #22  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thank you very much people. It turns out that there was an issue with the chain, I tried a different chain on and the error has gone away. Strange how the chain was the problem as I removed the faulty chain and it was straight when I laid it out, but was bent when fixed onto the bike.
TonyN98 is offline  
Old 08-19-16, 09:32 AM
  #23  
NYMXer
Senior Member
 
NYMXer's Avatar
 
Join Date: Oct 2015
Location: Middletown NY
Posts: 1,495

Bikes: Cannondale SuperSix EVO w Hi-Mod frame, Raleigh Tamland 1 and Giant Anthem X

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 352 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by TonyN98 View Post
Thank you very much people. It turns out that there was an issue with the chain, I tried a different chain on and the error has gone away. Strange how the chain was the problem as I removed the faulty chain and it was straight when I laid it out, but was bent when fixed onto the bike.

Glad that you got it resolved and we could help. Now, it's time to go out for a ride, but first, lube that chain.
NYMXer is offline  
Old 08-19-16, 09:34 AM
  #24  
TonyN98
Junior Member
Thread Starter
 
Join Date: Aug 2016
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Sure thing!
TonyN98 is offline  
Old 09-05-16, 12:50 PM
  #25  
Kaze6
Senior Member
 
Join Date: Sep 2016
Posts: 135
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 358 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by TonyN98 View Post
Thank you very much people. It turns out that there was an issue with the chain, I tried a different chain on and the error has gone away. Strange how the chain was the problem as I removed the faulty chain and it was straight when I laid it out, but was bent when fixed onto the bike.
A derailleur chain has some side-to-side flex, making it harder to spot a kink when it's just sitting there. It shows up nicely in the video.

Another way to know that it's the chain is that the problem doesn't occur at the same point of every rev of the pedals, but affects the chainset. The only other chainset-related issue which is at different points in the cycle would be bearings in the bottom bracket.
Kaze6 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
readygetsetBen
Singlespeed & Fixed Gear
1
07-17-15 10:04 PM
kjrayo18
Bicycle Mechanics
9
04-07-15 07:27 PM
flats
Bicycle Mechanics
17
02-15-13 06:27 AM
JohnnyDePaola
Bicycle Mechanics
3
09-17-12 07:44 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.