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

Chain Problem? help please?

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.

Chain Problem? help please?

Old 09-23-13, 11:44 AM
  #1  
mrhellboy218
Newbie
Thread Starter
 
Join Date: Sep 2013
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Chain Problem? help please?

Hi, I've been having problems with my x rated exile jump bike. The chain would just fall off from the back, I shortend the chain before it work for a while and now the problem has come again. I've thought about getting a new chain because I've cycled that bike a good load from when I had it 5 days each week. So yea and for a Dirt Jump bike what chain would you reccomend would a chain made for a mountain bike work?
I had this cahin in mind: https://www.theboardroom.ie/shop/bmx-...n-theboardroom
but it that's good take a look at the others: https://www.theboardroom.ie/shop/bmx-parts/chains
which one would you use for a Dirt Jump bike? Thanks for the help
mrhellboy218 is offline  
Old 09-23-13, 11:09 PM
  #2  
oldbobcat
Senior Member
 
oldbobcat's Avatar
 
Join Date: Jul 2005
Location: Boulder County, CO
Posts: 3,012

Bikes: '79 Gios, '80 Masi, '06 Felt, early '60s Frejus

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 34 Post(s)
Liked 19 Times in 14 Posts
Have you tried just tightening the chain tension? Loosen the axle nuts, pull the rear wheel tight against the chain, and re-tighten the nuts, just tight enough so the chain doesn't bind when you turn the cranks. Use a box end wrench. An adjustable will just round off the corners. You'll still have to re-tighten from time to time. Getting it right will also take some practice. The nature of the beast.

If you really need a new chain, any quality 1/2" x 1/8" chain will do. We like the SRAM PC1. A multi-speed mountain bike chain is too narrow for single speed cogs. But unless you got the bike used, it sounds like the chain is not worn enough to be the problem.

Last edited by oldbobcat; 09-23-13 at 11:14 PM.
oldbobcat is offline  
Old 09-23-13, 11:14 PM
  #3  
oldbobcat
Senior Member
 
oldbobcat's Avatar
 
Join Date: Jul 2005
Location: Boulder County, CO
Posts: 3,012

Bikes: '79 Gios, '80 Masi, '06 Felt, early '60s Frejus

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 34 Post(s)
Liked 19 Times in 14 Posts
Have you tried just tightening the chain tension? Loosen the axle nuts, pull the rear wheel tight against the chain, and re-tighten the nuts, just tight enough so the chain doesn't bind when you turn the cranks. Use a box end wrench. An adjustable will just round off the corners. You'll still have to re-tighten from time to time. Getting it right will also take some practice. The nature of the beast.

If you really need a new chain, I can only tell you that mountain bike chains are made for derailleur-equipped multi-speed cogs that are too narrow for single-speed cogs. Without seeing your current chain or measuring the width of the cogs I wouldn't want to make a recommendation
oldbobcat is offline  
Old 09-24-13, 09:41 AM
  #4  
mrhellboy218
Newbie
Thread Starter
 
Join Date: Sep 2013
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
hmm well I have tried doing all the above, the problem which I have is that, I have pulled the rear wheel outwards to tighten the chain but when I start to cycle the wheel starts to pull back in. I have an old bike with a decent chain I'll switch the chains and see how it goes but thanks for your reply
mrhellboy218 is offline  
Old 09-24-13, 12:15 PM
  #5  
demoncyclist
Senior Member
 
demoncyclist's Avatar
 
Join Date: Oct 2002
Location: Medway, MA
Posts: 2,727

Bikes: 2011 Lynskey Sportive, 1988 Cannondale SM400

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I'm going to guess that your axle nuts don't have the teeth they used to, or were swapped at some point with some that are not serrated on the inner surface. Get a new set of proper nuts, and make sure you tighten them down securely on the droputs, which may need to be filed a little to make everything bite right.
demoncyclist is offline  
Old 09-24-13, 01:40 PM
  #6  
cny-bikeman 
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,510

Bikes: 2008 Novara Randonee - love it. Previous bikes:Motobecane Mirage, 1972 Moto Grand Jubilee (my fave), Jackson Rake 16, 1983 C'dale ST500.

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 481 Post(s)
Likes: 0
Liked 3 Times in 3 Posts
Serrated flat washers are an option, too. Back when many more bikes had bolt-on wheels we stocked some that had some pretty sharp points around the perimeter.
__________________
There's no such thing as a routine repair.

Don't tell me what "should" be - either it is, it isn't, or do something about it.

If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

Please respect others by taking the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!
cny-bikeman is offline  
Old 09-24-13, 02:15 PM
  #7  
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 15 Times in 15 Posts
OK, we have to identify the actual problem, and the type of bike.

I gather it's a single speed, but please confirm. Also say whether it has rear suspension or not as this makes a tremendous difference. If it does have rear suspension, a photo will be very handy, or an accurate description of the pivot points and linkages.

Now the problem.

Is the wheel moving forward causing chain slack?
Is the chain tension OIK, ie. slight visible slack at ll times, yet the chain falls off?
What else should we know?

A chain can derail even if everythins is spot on if for example the sprocket has a damaged tooth, the chain line is off slightly, or the tooth profile isn't right to pick up the chain as it approaches. This will be worse on a jump bike because the chain is bouncing around and can deflect sideways, then snag and climb up onto the tips of the teeth and derail.
__________________
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  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Cycleeind
Bicycle Mechanics
5
03-05-18 04:35 PM
AFMurse
Mountain Biking
4
09-06-15 07:22 AM
rick_mill
Singlespeed & Fixed Gear
10
10-02-14 03:00 PM
ganapati
Bicycle Mechanics
2
07-17-12 02:25 AM
tsappenfield
Classic & Vintage
6
07-19-11 02:23 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 © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.