Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

Help needed with bike chain please

Notices
General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

Help needed with bike chain please

Old 06-14-21, 02:34 PM
  #1  
Ringokid
Junior Member
Thread Starter
 
Join Date: Jun 2021
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Help needed with bike chain please

My daughter claimed she needed a new chain so I purchased the chain and fitted it but there seems to be a big problem. It seems too short. The largest front chain set has 48 teeth and the largest rear set has 28 teeth. The chain stay is 44 cm so by my calculations the chain should be 139cm or 110 links. Am I correct in this
Ringokid is offline  
Old 06-14-21, 02:38 PM
  #2  
njkayaker
Senior Member
 
Join Date: Sep 2007
Posts: 12,365
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 2744 Post(s)
Liked 480 Times in 330 Posts
Typically, one uses the old chain to get the length of the new chain.
njkayaker is offline  
Old 06-14-21, 02:40 PM
  #3  
Ringokid
Junior Member
Thread Starter
 
Join Date: Jun 2021
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
The old chain is also 139cm I wanted to check that it was correct
Ringokid is offline  
Old 06-14-21, 02:41 PM
  #4  
terrymorse 
climber has-been
 
terrymorse's Avatar
 
Join Date: Dec 2004
Location: Palo Alto, CA
Posts: 4,212

Bikes: Scott Addict R1

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 890 Post(s)
Liked 688 Times in 390 Posts
I use the big cog, big ring sizing method.

Good instructions at Park Tool
__________________
Ride, Rest, Repeat
terrymorse is offline  
Likes For terrymorse:
Old 06-14-21, 02:46 PM
  #5  
caloso
Senior Member
 
caloso's Avatar
 
Join Date: Jul 2002
Location: Sacramento, California, USA
Posts: 40,194

Bikes: Ridley Excalibur, Gazelle Champion Mondial, On-One Pompino, Specialized Rock Hopper

Mentioned: 66 Post(s)
Tagged: 0 Thread(s)
Quoted: 2671 Post(s)
Liked 2,262 Times in 1,067 Posts
Originally Posted by Ringokid View Post
The old chain is also 139cm I wanted to check that it was correct
If it's the same as the previous one, and if that one fit, then you should be good.
caloso is offline  
Likes For caloso:
Old 06-14-21, 03:01 PM
  #6  
Ringokid
Junior Member
Thread Starter
 
Join Date: Jun 2021
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
It is the same length as the old one but that kept slipping so I was checking that the length was correct first. She thought it seemed loose
Ringokid is offline  
Old 06-14-21, 03:03 PM
  #7  
Ringokid
Junior Member
Thread Starter
 
Join Date: Jun 2021
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
I was going to post a pic but I have to have 10 posts to do that hehe
Ringokid is offline  
Old 06-14-21, 03:08 PM
  #8  
Iride01
Hits [ENTER] b4 thinking
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 7,629

Bikes: '20 Tarmac Disc Comp '91 Schwinn Paramount '78 Raleigh Competition GS

Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 2993 Post(s)
Liked 1,589 Times in 1,157 Posts
What do you mean by "slipping"? Is this a bike with multiple external gears and derailleurs? Or is it a single speed or internal gear hub? Number of gears on the rear can make a difference on what chain you get too. If you got a 8 speed chain for a 11 speed rear, then that is going to be issues. Maybe the slipping.

You can just write the URL of you pics or vids in the plain text of your next message and remove the https:// and put a space before and after any . (dot) that is in the URL.

There are also posting limits on noobs too. Usually at five per day. Don't know how long that lasts. Maybe till you aren't so noobish, or it might be a one time thing.

Last edited by Iride01; 06-14-21 at 03:15 PM.
Iride01 is offline  
Old 06-14-21, 03:23 PM
  #9  
Barry2 
LRP=HR
 
Join Date: Sep 2019
Location: SF Bay Area
Posts: 936

Bikes: 79 Holdsworth Special, 93 C-dale MT3000 Tandem, 96 C-dale F700CAD3, 2018 Cervelo R3, JustGo Runt, Ridley Oval, Kickr Bike 8-)

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 359 Post(s)
Liked 352 Times in 225 Posts
Let's first get the Chain length correct first, which the video below will help with.

Park Tool Chain Length

Barry

BTW: one more post and you'll be able to post a picture of the setup.
Time to go say hello in the Introductions Forum.
Barry2 is offline  
Old 06-15-21, 11:55 AM
  #10  
BikingViking793 
Senior Member
 
Join Date: Aug 2017
Location: Wisconsin
Posts: 353

Bikes: 2015 Felt Z75 Disc, 2008 Fuji Cross Comp, 2010 Trek Navigator 1.0, 2010 Raleigh Talus 3.0, 1974 Raleigh Sports, 1974 Schwinn Le Tour, 1981 Schwinn Super Le Tour

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 135 Post(s)
Liked 46 Times in 39 Posts
Originally Posted by Ringokid View Post
My daughter claimed she needed a new chain so I purchased the chain and fitted it but there seems to be a big problem. It seems too short. The largest front chain set has 48 teeth and the largest rear set has 28 teeth. The chain stay is 44 cm so by my calculations the chain should be 139cm or 110 links. Am I correct in this
what type of bike is this?
__________________
check out the Frugal Average Bicyclist
Frugal Average Bicyclist The goal here is to help you keep cycling on a budget.
BikingViking793 is offline  
Old 06-15-21, 02:46 PM
  #11  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 1,811

Bikes: lots

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 822 Post(s)
Liked 1,046 Times in 585 Posts
Don't bother w/ 'chain length calculators' or using the old chain unless you know for sure that it's the correct length. Use the specific instructions for the drivetrain you have on the bike. If it's a 'normal' double or triple and everything (cass, c-rings, rear derailleur) is within spec use the small/small method, it gives you the longest/safest chain.
And of course this thread should be in 'bicycle mechanics' not GD.
cxwrench is offline  
Old 06-15-21, 02:46 PM
  #12  
Ringokid
Junior Member
Thread Starter
 
Join Date: Jun 2021
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Hi it is an 18 speed MTB
Ringokid is offline  
Old 06-15-21, 02:49 PM
  #13  
Ringokid
Junior Member
Thread Starter
 
Join Date: Jun 2021
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
This was the issue I had in its the derailleur so far forward with the chain on both the largest cogs.



I have had another go today as I realised I forgot to take into account she has rear suspension. Couple of links added (4) and it all seems good again
Ringokid is offline  
Old 06-15-21, 02:54 PM
  #14  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 1,811

Bikes: lots

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 822 Post(s)
Liked 1,046 Times in 585 Posts
Great example of a calculator not working and using the old chain not working either. It's just so damn easy to put the chain on the bike and figure it out the right way.
cxwrench is offline  
Old 06-15-21, 02:57 PM
  #15  
Ringokid
Junior Member
Thread Starter
 
Join Date: Jun 2021
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Sorry cxwrench I didnt mean to post in wrong discussion,
Ringokid is offline  
Old 06-15-21, 03:01 PM
  #16  
zandoval 
Senior Member
 
zandoval's Avatar
 
Join Date: May 2010
Location: Bastrop Texas
Posts: 2,193

Bikes: Univega, PR-10, Ted Williams,UO-8, Puch, PHLE, UO-18 Mixte

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 132 Post(s)
Liked 134 Times in 103 Posts
Understood... On some of the older bicycles the frame is just longer. For example I have an old Ted WIlliams Step Through. Sold by Sears long ago the frame was actually made my Austro-Daimler in Hungary. It is a long frame with plenty of room for fitting a bicycle rack and fenders. There is allot of room between the rear tire and the seat tube. I saved the frame and added parts box components to it for a nice ride. It takes a 62 inch chain to fit the 34T freewheel cog to 51T large crank ring. Its a very fast sleeper bike, and when my boys come over its one of thier favourite rides.
__________________
No matter where your at... There you are... Δf:=f(1/2)-f(-1/2)
zandoval is offline  
Old 06-16-21, 07:24 AM
  #17  
VegasTriker
Senior Member
 
Join Date: Feb 2006
Location: Sin City, Nevada
Posts: 2,484

Bikes: Catrike 700, Greenspeed GTO trike, , Linear LWB recumbent, Haluzak Horizon SWB recumbent, Balance 450 MTB, Cannondale SM800 Beast of the East

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 414 Post(s)
Likes: 0
Liked 107 Times in 83 Posts
Buy an extra master link and add back enough links to bring the rear derailleur back underneath the cassette if you kept the rest of the chain. A normal chain is 116 links with the master link. If you don't have any more chain left it is time to just buy a new one. Remember the chain has to match the number of gears in the back. Six, seven, and eight speed are all one chain but 9 speed and above use different chains and different master links. Here in the US an 8 speed KMC chain costs about $14 on eBay but since you are using metric measurements you are probably not in the US. Then follow the directions on Park Tool to adjust it properly.
VegasTriker is offline  
Old 06-16-21, 08:09 AM
  #18  
Iride01
Hits [ENTER] b4 thinking
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 7,629

Bikes: '20 Tarmac Disc Comp '91 Schwinn Paramount '78 Raleigh Competition GS

Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 2993 Post(s)
Liked 1,589 Times in 1,157 Posts
Hard for me to decide from that picture, but the cog the chain is on currently look like they might be worn. Even with the correct chain length it might still skip. If skipping is the OP's slipping.

If the bike was purchased as a used bike, then perhaps the previous owner made the chain a little shorter in a desperate attempt to solve the skipping.
Iride01 is offline  
Old 06-16-21, 08:22 AM
  #19  
Phil_gretz
Journeyman Bike Commuter
 
Phil_gretz's Avatar
 
Join Date: Aug 2009
Location: Alexandria, VA
Posts: 6,666

Bikes: '71 Jeunet 640, '79 Peugeot PXN10LE, '88 Fuji Saratoga, '13 Motobecane Fantom29 HT, '16 Motobecane Turino Pro Disc, '16 Motobecane Gran Premio Elite, '18 Velobuild VB-R-022

Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 1308 Post(s)
Liked 1,187 Times in 641 Posts
Now would be a good time to replace the Shimano 14-28T 7-speed freewheel.

Amazon.com : MEGHNA Shimano Tourney/TY MF-TZ500 7-Speed Multiple Freewheel, 14-28 Tooth : Sports & Outdoors
Phil_gretz is offline  
Old 06-17-21, 03:17 PM
  #20  
Ringokid
Junior Member
Thread Starter
 
Join Date: Jun 2021
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Hi and thanks for your replies I will look at replacing the 6 speed freewheel anyway but after adjusting the chain length the gears now shift correctly and no slipping as yet.
Ringokid is offline  
Old 06-17-21, 09:11 PM
  #21  
canklecat
Me duelen las nalgas
 
canklecat's Avatar
 
Join Date: Aug 2015
Location: Texas
Posts: 12,808

Bikes: Centurion Ironman, Trek 5900, Univega Via Carisma, Globe Carmel

Mentioned: 190 Post(s)
Tagged: 0 Thread(s)
Quoted: 4181 Post(s)
Liked 2,082 Times in 1,334 Posts
If it's a mountain bike-shaped comfort hybrid it probably has a longer than usual wheelbase and it may be necessary to splice two new chains together. My early 2000s Globe Carmel looks sorta-mountain-bike-ish (compact frame, sloping top tube, suspension fork, etc.), but it's really a long wheelbase comfort hybrid/city bike, almost as long as a Yuba cargo bike. I spliced a pair of inexpensive KMC Z50 or comparable chains together. IIRC, I needed six links from the second chain to make one proper length chain. It's worked fine for a few years that way.

Ditto, replacing the freewheel, although I prefer SunRace over Shimano's cheaper freewheels. Both are good for the money but the SunRace are a bit better at that price level.
canklecat is offline  

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.