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

Grinding noise when pedalling

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.

Grinding noise when pedalling

Old 08-21-13, 06:09 AM
  #1  
Brian Fantana
Newbie
Thread Starter
 
Join Date: Aug 2013
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Grinding noise when pedalling

Recently my road bike has started to make a grinding noise when pedalling and it feels like there is some reverberation in the pedals (but that might be paranoia). It only happens when pushing down on the pedals with force (being off the bike and just spinning the pedals doesn't make any noise) and at first it was only on climbs, but within a few miles it was happening when seated as well.

I gave the whole thing a clean and oil and it cleared up, but only for about half a mile and then restarted, again firstly noticable on standing and progressing to also grinding when seated. I oiled the chain once more in hope that it was just a dry spot rubbing, but it didn't have any affect whatsoever.

Can anybody give a hint as to where the problem might be, before I start taking things apart. The bike is a few years old now, so wear and tear is a possibility for all components.
Brian Fantana is offline  
Old 08-21-13, 06:34 AM
  #2  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 37,657

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 134 Post(s)
Tagged: 1 Thread(s)
Quoted: 5248 Post(s)
Liked 1,546 Times in 882 Posts
Start by spinning the pedals and listening for dirt or grinding in the bearings. Next, slip the chain off the rings and put it where it doesn't touch the crank at all. Spin the cranks and listen for bearing noise. Last pick up the wheel, and spin it listening for a noisy bearing.

I'm betting that all check out OK, and since the bike is a bit older it's simply the normal noise and feel of a worn chain and sprockets. Some chain oils mask this better than others, but nothing changes the fact that chains and sprockets wear, and the engagement won't be as smooth.

One thing you will want to do is measure your chain for wear (stretch). Search "chain stretch" here on BF or on the net if you don't know how to measure, and follow the generally accepted guideline to replace it if it's stretched 1/2% (1/16" over 12").

If it's stretched more than 1/8" you might want to replace it, but don't scrap it yet. There's a good chance the new chain won't run on your old cassette and you'll have a choice of replacing the cassette also, or going back to the old chain and running it a while longer.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 08-21-13, 09:32 AM
  #3  
Bjforrestal
Senior Member
 
Join Date: Jul 2013
Location: South St. Paul, MN
Posts: 260

Bikes: Trek 520, Peugeot PX-10

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Grinding noise when pedalling

Grinding, like scratching? Gritty? How do you clean your chain? Be specific.
Bjforrestal is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
habilis
Bicycle Mechanics
7
09-09-15 07:42 PM
cityslicker
Singlespeed & Fixed Gear
4
06-27-14 11:45 AM
Glottis
Bicycle Mechanics
16
07-08-11 12:28 PM
Austinnh
Singlespeed & Fixed Gear
25
01-18-11 04:35 AM
yummygooey
Singlespeed & Fixed Gear
17
03-24-10 07:07 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 - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.