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

New to the site, looking for some MTB advice/

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.

New to the site, looking for some MTB advice/

Old 02-09-13, 06:49 PM
  #1  
KSD37
Newbie
Thread Starter
 
Join Date: Feb 2013
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
New to the site, looking for some MTB advice/

Hey my name is Kevin, I ride a Trek 7000 and and a Trek 4300. I just bought the 4300 and it had a skip in it while pedaling hard on the cranks. I changed the crank arms, chain rings, and rear cassette. Had the front, rear derailleur adjusted, and chain checked for wear. The chain checked good and was within specification. With having new front chain rings, rear cassette, and chain within specs I am lost and the problem still persists under hard crank. It seems like the chain skips. I am not certain how old the chain actually is but only that it is within factory specs. Any suggestions on what I should replace next??
KSD37 is offline  
Old 02-09-13, 06:54 PM
  #2  
no1mad 
Thunder Whisperer
 
no1mad's Avatar
 
Join Date: Apr 2008
Location: NE OK
Posts: 8,852

Bikes: '06 Kona Smoke

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 272 Post(s)
Likes: 0
Liked 5 Times in 1 Post
Welcome aboard

This question would would be right at home in the Bicycle Mechanics forum. Give me just a second and I'll move the thread there...
no1mad is offline  
Old 02-09-13, 08:33 PM
  #3  
LarDasse74
Guest
 
Join Date: Jul 2008
Location: Grid Reference, SK
Posts: 3,768

Bikes: I never learned to ride a bike. It is my deepest shame.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Some details would be helpful:

Does it only skip in one or certain gears or gear combinations?
Does it ever skip when not under heavy pedaling pressure?
Does it shift smoothly between all gears?

Without seeing the bike, the only suggestion I have is to check the alignment of the rear derailleur hanger - if it is off by just a small amount it can affect the way the chain interacts with the rear cassette.
Another possible source of the problem is the freehub (the mechanism that allows the rear wheel to turn without the gears and chain turning). If the innnards of the freehub get fouled up or the grease deteriorates, sometimes it will cause skipping.
LarDasse74 is offline  
Old 02-09-13, 08:37 PM
  #4  
FBinNY 
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: 124 Post(s)
Tagged: 1 Thread(s)
Quoted: 4361 Post(s)
Likes: 0
Liked 18 Times in 18 Posts
If it skips in any gear, and tends to skip every few pedal revolutions, a likely cause is a stiff link.

The easiest way to look for a stiff link is to push the RD lower pulley forward to slacken the lower loop until it sags about 1". Then backpedal slowly watching the chain as it comes off the lower pulley. You're looking for a visible hitch or a link that doesn't straighten immediately. If you find a stiff link try to flex it sideways with your thumb on the pin as a fulcrum. Also flush it with solvent, then let it dry and oil it. If you can get the link good enough to ride, it gets better with wear.
__________________
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 02-09-13, 11:49 PM
  #5  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 13,948

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: 2553 Post(s)
Liked 643 Times in 485 Posts
While not a cure for your problem it's common advice to replace the chain when replacing the cogs. Andy.
Andrew R Stewart is offline  
Old 02-10-13, 08:09 AM
  #6  
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Posts: 7,706

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

Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
Quoted: 1198 Post(s)
Liked 602 Times in 432 Posts
How did you measure the chain and determine that it was "good"? Within what specs? Chain checkers are notoriously inaccurate; the only method I trust is to measure the chain with a good steel rule.

Whatever the measurement, almost by definition a chain which skips on a new cassette should be replaced.
dsbrantjr is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
124Spider
Bicycle Mechanics
9
09-03-19 03:14 PM
cpper
Bicycle Mechanics
7
07-30-17 11:59 AM
boomwater
General Cycling Discussion
15
12-21-15 07:50 AM
boomwater
Bicycle Mechanics
9
08-15-13 04:17 AM
Salabarria
Bicycle Mechanics
8
05-30-12 12:19 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.