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.

Time for new Cassette?

Old 10-04-15, 08:45 PM
  #1  
illusiumd
Senior Member
Thread Starter
 
Join Date: Jun 2013
Posts: 335
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Time for new Cassette?

Couple newb questions. Got a new chain and the thing is skipping on multiple cogs. I replaced the chain with the same model - so I'm assuming that means time for new cassette? I probably should have replaced the chain some time ago - I've probably put around 2k miles on the old chain and cassette.

So I have a 12-27 and was just going to get same so to reduce hassle. If I got something pretty similar like a 12-25 would I need to adjust the DeRailleur?
illusiumd is offline  
Old 10-04-15, 09:04 PM
  #2  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,049

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: 121 Post(s)
Tagged: 1 Thread(s)
Quoted: 4340 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Not all skipping is caused by the new chain on old cassette phenomenon. While it's possible, I wouldn't have have expected that a cassette could wear to where a new chain skips in so few miles.

Also the new/old issue usually affects only the one or two most used sprockets, and/or the smaller ones.

So before giving up, I'd do some due diligence and check for things like RD trim.

OTOH - if you saved the old chain it's the best clue about the current issue. If it's stretched only 1/2% or so, then odds favor the cassette being OK. More than 1% odds are against the cassette, and in between then anybody's guess.
__________________
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.

Last edited by FBinNY; 10-05-15 at 04:52 AM.
FBinNY is offline  
Old 10-04-15, 09:24 PM
  #3  
Homebrew01
Super Moderator
 
Homebrew01's Avatar
 
Join Date: Jul 2004
Location: Ffld Cnty Connecticut
Posts: 21,037

Bikes: Old Steelies I made, Old Cannondales

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 792 Post(s)
Likes: 0
Liked 21 Times in 19 Posts
You should not have to make any changes going from 27 to 25.
__________________
Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike.

FYI: http://www.bikeforums.net/forum-sugg...ad-please.html
Homebrew01 is offline  
Old 10-05-15, 04:47 AM
  #4  
Squashednuts
Senior Member
 
Join Date: May 2015
Location: Christchurch, New Zealand
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by illusiumd View Post
Got a new chain and the thing is skipping on multiple cogs. I replaced the chain with the same model - so I'm assuming that means time for new cassette? I probably should have replaced the chain some time ago - I've probably put around 2k miles on the old chain and cassette.
I had a similar experience, I replaced the chain & it started skipping. My first thought was a new case te so I duly researched prices.

I didn't want to fork out the cash so Checked chain again.

I'd mis threaded the chain around the rear derailleur. I'm not suggesting that you're as cack handed as me mearly that a new cassette may not be the answer
Squashednuts is offline  
Old 10-05-15, 06:10 AM
  #5  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,771

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 651 Post(s)
Liked 19 Times in 18 Posts
A 12-25 cassette won't result in any other "adjustments" that any other cassette wouldn't require.
Due to manufacturing tolerances, you may have to turn the barrel adjuster from 0 turns, up to a 1/2 turn. That's just normal.

Going to a smaller largest cog MIGHT allow you to shorten the chain 1 linkset, but it wouldn't be necessary.
Bill Kapaun is offline  
Old 10-05-15, 07:53 AM
  #6  
illusiumd
Senior Member
Thread Starter
 
Join Date: Jun 2013
Posts: 335
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Squashednuts View Post
I'd mis threaded the chain around the rear derailleur. I'm not suggesting that you're as cack handed as me mearly that a new cassette may not be the answer
Great, thanks for the advice folks. Sq -> how'd you misthread?
illusiumd is offline  
Old 10-06-15, 03:03 AM
  #7  
Squashednuts
Senior Member
 
Join Date: May 2015
Location: Christchurch, New Zealand
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by illusiumd View Post
how'd you misthread?
On the bottom black cog
I managed to pass the chain outside of the metal guide so it was only connecting with 1/2 the teeth on the cog.
I did two rides of an hour twenty each time before I noticed my mistake
Attached Images
File Type: jpg
image.jpg (46.3 KB, 22 views)
Squashednuts is offline  
Old 10-06-15, 03:25 AM
  #8  
Bike Gremlin
Bike Gremlin
 
Bike Gremlin's Avatar
 
Join Date: Nov 2010
Location: Novi Sad
Posts: 4,092

Bikes: Custom made on Scott Speedster frame, Custom made on a 1996. steel MTB frame (all but frame changed at least once in the past 20 years).

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 939 Post(s)
Liked 2 Times in 2 Posts
Perhaps a b-screw adjustment on RD. To keep it closer to the 25 cog.
Bike Gremlin is offline  
Old 10-08-15, 11:48 AM
  #9  
BikingZombie
Senior Member
 
Join Date: Sep 2015
Location: Twin Cities, MN
Posts: 120

Bikes: Surly CC

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Squashednuts View Post
On the bottom black cog
I managed to pass the chain outside of the metal guide so it was only connecting with 1/2 the teeth on the cog.
I did two rides of an hour twenty each time before I noticed my mistake
Didn't that make a hell of a racket while riding?
BikingZombie is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mzeffex
"The 33"-Road Bike Racing
0
01-13-10 08:15 PM
Pamestique
United Kingdom
1
08-07-08 04:28 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.