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

Tandem crank knocking - help with cause and cure

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.

Tandem crank knocking - help with cause and cure

Old 07-04-06, 09:32 AM
  #1  
stuartwickes
Junior Member
Thread Starter
 
Join Date: Jul 2004
Location: North West UK
Posts: 22
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Tandem crank knocking - help with cause and cure

Hi there, looking for some ideas on cause and cure for 'knocking' on Burley Rock n Roll tandem.

Symptom - intermittent 'knocking' which seems to be related to crank rotation. Feels like it's related to captain's bottom bracket or crank/timing chain setup. Happens about same point in each crank rotation.
Most pronounced when cranking without putting too much power in and seems to almost disappear when powering hard on the cranks.

Any ideas? I'm stumped and don't know where to start!

Stuart
stuartwickes is offline  
Old 07-04-06, 09:50 AM
  #2  
seely
The Rabbi
 
seely's Avatar
 
Join Date: Apr 2004
Posts: 5,125
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 15 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I'd try a loose bottom bracket, worn bottom bracket bearings, loose crank arm, worn pedal bearings to start.
seely is offline  
Old 07-04-06, 12:46 PM
  #3  
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 29,268

Bikes: Catrike 559 I own some others but they don't get ridden very much.

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 1149 Post(s)
Liked 22 Times in 17 Posts
Check out the relationship between the captain's seat and the stoker's handlebar & stem.

Actually, I have a similar issue with my own tandem and that's my next avenue to research.
Retro Grouch is offline  
Old 07-04-06, 10:19 PM
  #4  
jacksbike
Senior Member
 
Join Date: Jul 2005
Location: New Haven, CT area
Posts: 1,362

Bikes: Trek 7.5 Hybrid, Trek 1.1 Road, Holdsworth touring,Raleigh International,Ritchey Commando,Italvega Speciallissimo,et.al.

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I had a problem similar to this on an older Peugeot tandem. I think that the problem was caused by the 2 cranksets being set out of sync plus possibly some chain problems with a left and right side chains. It could also be as simple as a pedal problem that knocks every revolution at the same point. As noted above, check the bb for tightness.
jacksbike is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Chris s
Mountain Biking
3
03-22-10 05:50 AM
simplyred
Road Cycling
3
11-16-05 10:51 PM

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

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