Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-28-10, 09:00 AM   #1
mustachiod
Senior Member
Thread Starter
 
mustachiod's Avatar
 
Join Date: May 2010
Location: Chicago, IL
Bikes:
Posts: 699
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
mystery noise

yesterday i started hearing a clanging sound while pedaling my singlespeed. I do not hear it while coasting and it is also not always there. i can't figure out what makes it start or stop. it's driving me nuts

it sounds like something is hitting against something else and has a metallic twang to it. there is nothing rubbing any of the wheels or spokes. chain is lubed and tension is good. nothing feels loose.

i recently swapped a new freewheel and it rained yesterday, could those be contributing factors?
mustachiod is offline   Reply With Quote
Old 09-28-10, 09:17 AM   #2
MitchL
Senior Member
 
MitchL's Avatar
 
Join Date: Aug 2010
Location: Maine
Bikes:
Posts: 149
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It could be coming from the pedals. Make sure they are tight in the cranks. And depending on the type of pedal make sure everything is tight with the pedal itself.

Pics are always good.
MitchL is offline   Reply With Quote
Old 09-28-10, 09:28 AM   #3
jsharr
You Know!? For Kids!
 
jsharr's Avatar
 
Join Date: Apr 2005
Location: Just NW of Richardson Bike Mart
Bikes: '05 Trek 1200 / '90 Trek 8000 / '? Falcon Europa
Posts: 6,157
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
toe strap buckle hitting something?
__________________
Are you a registered member? Why not? Click here to register. It's free and only takes 27 seconds! Help out the forums, abide by our community guidelines.
Quote:
Originally Posted by colorider View Post
Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
jsharr is offline   Reply With Quote
Old 09-28-10, 09:34 AM   #4
peripatetic
Senior Member
 
peripatetic's Avatar
 
Join Date: Oct 2004
Location: NYC
Bikes: All 70s and 80s, only steel.
Posts: 2,124
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Do you have fenders on the bike? A rack? Try mounting the bike so you can pedal it; get an old cardboard tube from paper towels or toilet paper and use that to isolate/locate where on the bike the sound is coming from.

Also, check to make sure you don't have a broken spoke clanging around on one of the wheels.
peripatetic is offline   Reply With Quote
Old 09-28-10, 09:50 AM   #5
mustachiod
Senior Member
Thread Starter
 
mustachiod's Avatar
 
Join Date: May 2010
Location: Chicago, IL
Bikes:
Posts: 699
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
thanks will check pedals and toe straps before riding home. there are no fenders, racks or broken spokes. will also put it on the trainer tonight and see if i can get isolate the sound. i was trying to do it while riding this morning and realized that wasn't the safest way to go. Tell me more about the cardboard tubes, what do i do with those?

i only have a pic from last spring with me right now, (http://img84.imageshack.us/img84/7691/madisonv.jpg) can take some more tonight
mustachiod is offline   Reply With Quote
Old 09-28-10, 11:54 AM   #6
BCRider
Senior Member
 
BCRider's Avatar
 
Join Date: Mar 2008
Location: The 'Wack, BC, Canada
Bikes: Norco (2), Miyata, Canondale, Soma, Redline
Posts: 5,456
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Check the length of your laces as well. I had a bike that used to give the occasional series of twang sounds. Took me a while to realize that it was the tag ends of the shoe laces hitting the tubes at certain cadences and when the laces were tied so that the loose ends were longer. THAT was a real headscratcher for a while.
BCRider is offline   Reply With Quote
Old 09-28-10, 03:55 PM   #7
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
Posts: 6,430
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
You need to do some detective work, looks like that's your plan. Check all bearings by trying to move the wheels, cranks, headset back and forth, check spokes for loosness or breakage, tighten and lubricate all appropriate points. If you come back having not found it need to know whether when it happens it is in time with pedal rate or wheel revolutions or totally random.
cny-bikeman is offline   Reply With Quote
Old 09-28-10, 11:04 PM   #8
mcgreivey
STFD
 
mcgreivey's Avatar
 
Join Date: Jul 2008
Location: North Bergen, NJ
Bikes: '80 Windsor Carrera Sport, '02 Specialized Sirrus A1, '10 Giant Escape 2
Posts: 778
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You could improve on the paper towel tube idea. Get a funnel, a couple feeds of plastic hose, duc-tape it to the small end of the funnel, get a towel and duc-tape it to the other end of the hose. Drill a couple of holes in the rim of the funnel, get some elastic, strap the funnel over your ear. Use the dowel to aim the far end of the hose at this thing or that as you pedal down the road.

It could work.

For maximum fun, ride by your boss's house on lawn-mowing day while using this homemade stethoscope.

Not making fun of the paper towel tube. It's a good idea. I'm just having a brainstorm brought on my a couple beers.
mcgreivey is offline   Reply With Quote
Old 09-29-10, 11:11 AM   #9
mustachiod
Senior Member
Thread Starter
 
mustachiod's Avatar
 
Join Date: May 2010
Location: Chicago, IL
Bikes:
Posts: 699
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
it started clanking on the way home and i was able to capture the sound with my phone, here it is:

Spent some time in the garage last night. Long story short: I think it was the 18t freewheel making noise. Swapped it for a 16t and there was no noise. put the 18t back on and the noise returned. So rode in today using the 16t and there was no noise.
mustachiod is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 04:38 PM.