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

Crank Popping Noise

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.

Crank Popping Noise

Old 02-26-15, 11:20 AM
Thread Starter
trailmixhawkeye's Avatar
Join Date: Feb 2014
Posts: 43
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Crank Popping Noise

Ok. first let me acknowledge the bike I have is a POS. So those who want to call it out... I already know it. Planning on getting something better once the snow is gone.

In the meantime I have this Mongoose XR250 bike.

Looks like this one....

I am riding it indoors on a magnetic trainer..... the last couple of days it has been making this popping noise and I know its from the crank area but not sure what it is and if its something thats an easy fix or not.

I don't have any LBS near me... would have to drive to one in a different town.

Here is the sound: https://www.knackjack.com/bikepop.wav
Attached Images
File Type: jpg
Mongoose-XR250-review.jpg (39.9 KB, 32 views)
trailmixhawkeye is offline  
Old 02-26-15, 11:26 AM
Old fart
JohnDThompson's Avatar
Join Date: Nov 2004
Location: Appleton WI
Posts: 22,838

Bikes: Several, mostly not name brands.

Mentioned: 134 Post(s)
Tagged: 0 Thread(s)
Quoted: 2684 Post(s)
Liked 1,395 Times in 866 Posts
It's impossible to say how difficult it might be to fix. Bike noises are notoriously difficult to track down, and impossible to diagnose via remote viewing. Your best bet is to take it to a shop and see if they can reproduce the noise and offer advice.
JohnDThompson is offline  
Old 02-26-15, 01:13 PM
Senior Member
dsbrantjr's Avatar
Join Date: Sep 2010
Location: Roswell, GA
Posts: 8,152

Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta

Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 1371 Post(s)
Liked 905 Times in 630 Posts
Do the easy things first, eliminate the pedals as a source of the noise. Borrow a set of pedals known to be quiet (from another bike, friend or whatever), clean and grease the pedal and crank threads, install and tighten firmly. See if this helps. If it does you are done, otherwise go on to the harder stuff. Also, make sure that the noise is not caused by the front derailleur cable end tapping the crank as it goes past.
dsbrantjr is offline  
Old 02-26-15, 01:21 PM
Senior Member
bikeman715's Avatar
Join Date: Mar 2008
Location: Salinas , Ca.
Posts: 2,646

Bikes: Bike Nashbar AL-1 ,Raligh M50 , Schwinn Traveler , and others

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 85 Post(s)
Liked 1 Time in 1 Post
check the crankarms make sure they tight to the axle . there should be no play in them . Also check the bottom bracket for any play if so adjust it . if it a seal unit replace it .
bikeman715 is offline  
Old 02-26-15, 07:31 PM
Andrew R Stewart 
Senior Member
Andrew R Stewart's Avatar
Join Date: Feb 2012
Location: Rochester, NY
Posts: 15,169

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3011 Post(s)
Liked 1,335 Times in 934 Posts
The sound sure doesn't sound to me like any arm/pedal/ring bolts one to me. It's deeper then what I would expect. Perhaps BB in shell or bearings. But I do agree that one starts with the easy and lowest cost possibilities first if unsure. Please report back.

BTW the noise could also be frame/suspension. Noises can travel in ways many don't expect. Andy.
Andrew R Stewart is offline  
Old 02-26-15, 08:29 PM
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 35,964

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: 125 Post(s)
Tagged: 1 Thread(s)
Quoted: 4368 Post(s)
Likes: 0
Liked 40 Times in 35 Posts
There's a bit of what sounds like a spring resonance. Are you sure it's not related to frame/suspension flex as you load the crank?

Other than that I have no idea, except that I've never heard a crank related sound anywhere close to that.
FBinNY is offline  
Old 02-26-15, 08:41 PM
Senior Member
Narhay's Avatar
Join Date: Sep 2012
Location: Toronto, ON, Canada
Posts: 3,595
Mentioned: 114 Post(s)
Tagged: 0 Thread(s)
Quoted: 903 Post(s)
Liked 418 Times in 250 Posts
Sounds like a loose bottom bracket. Mine was making popping noises.
Narhay is offline  
Old 02-27-15, 02:04 AM
Senior Member
Join Date: Jul 2007
Location: San Francisco
Posts: 205

Bikes: 1987 Raleigh 531C Team Replica, 1996 Litespeed Classic, 2001 Lemond Tete-De-Course, 2001 Lemond Zurich, 1999 Mongoose RX10.9, 2003 Lemond Wayzata, 2000 Litespeed Appalachian

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Liked 21 Times in 14 Posts
My bike had a broken bearing race on one side of the BB, and it made a sound similar to yours. The cranks and BB seemed tight, so it puzzled me for a while until I finally had a chance to overhaul my BB. That's when I found the broken bearing race. YMMV. I finished my overhaul with all loose bearing so that problem won't happen again. This, of course, may not apply in your case if your BB uses a sealed cartridge.
Warren128 is offline  
Related Topics
Thread Starter
Last Post
Bicycle Mechanics
05-26-16 02:37 AM
Road Cycling
08-17-14 04:35 PM
Bicycle Mechanics
07-26-12 12:50 PM
Bicycle Mechanics
09-13-11 12:48 PM
Road Cycling
06-20-10 02:09 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 My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.