Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the July Giveaway for a brand new 26" Thruster® Street Style BMX Cruiser Bicycle

New product launch: WIN an innovative aeroe Spider Rear Rack


Chain Tension, old peugeot
#1
hey,
i picked up an old peugeot racer the other day second hand, looks to be very old, not sure what type. Iv started updating parts, and i bought new 700 wheels to fit it, they were very tight and i had to force them in, but they fit. iv also removed the gears and put in a single speed cog, but i cant get the chain to tense.
the wheel when put back completely in the horizontal brackets, leaves the wheel completely crooked, aligning right, so i have to put it half way up one bracket and fully back on the other bracket, but this leaves the chain untensed, what can i do to fix this?

the wheel is perfect and new by the way. and the frame wasn't bent out of shape in any way when i put the wheel in.
  Reply
#2
A couple things could be going on. A couple questions:
1. If you pull the wheel all the way back in to the dropouts, is the rim not centered both down by the bottom bracket and up by the rear brake?

2. Do the dropouts look pretty identical? Sometimes the right side won't have as deep a slot as the left.

3. When you say the wheels were "tight", what do you mean? Is it that the axle was a bit too long and you had to kind of stretch the frame open wider to get it to pop in?

It could be that the frame's rear triangle is actually bent to one side a little. The good news is that that's usually fixable pretty easily.

If the wheel is brand new, it should be "dished" correctly (meaning the rim is centered over the axle). But if anyone played with the axle spacers, that could be off.

If you have a good ruler, measure the space between the two dropouts in the rear (not including the dropout, just the space).

Finally, note that the axle does not need to be all the way back in the dropout. Is has to be far enough that the axle nuts or QR skewer get plenty of metal to grab on to. But on a single speed, you usually shorten the chain enough so that you can get tension on the chain without pulling the axle all the way back.

(pictures would help too Wink
  Reply
#3
On old road bikes:
- the rear dropout spacing is usually less than the 130mm of today. You can widen the rear triangle (look at Sheldon Brown's homepage: http://www.sheldonbrown.com), if it is a steel frame. Then you can fit in a modern wheel.
- Then, the dérailleur hanger has to be straightened (look at tutorial on this site). (not a problem when running single speed).
- The rear dropouts on old steel road bikes were usually a bit out of alignment. There were screws installed to set the point where the rear wheel would sit.
- maybe you have to shorten the chain, maybe you have to install a half link.
- also: pic please (just curious)
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
205
06-06-2020, 03:20 AM
Last Post: jonsio
 
986
09-02-2019, 11:26 AM
Last Post: Aab
 
4,114
08-10-2014, 01:17 PM
Last Post: cny-man
 
7,638
01-06-2014, 08:23 PM
Last Post: 1FJEF
 
5,926
07-08-2013, 09:39 AM
Last Post: RBurrelli
 
6,805
09-28-2012, 12:28 PM
Last Post: nfmisso

Forum Jump:

[-]
10 Latest Posts
Post a photo for aeroe Spider Rear Rack
Today 01:08 PM
26" Thruster® Street Style BMX | July 20...
Today 12:38 PM
Biking inUtah
Today 10:25 AM
Requested question
Yesterday 11:20 PM
Ceramic Oversize Pulley
Yesterday 11:07 PM
RD Alignment
Yesterday 03:40 PM
2020 road cycling season
Yesterday 02:55 PM
Taylor Phinney retires
Yesterday 02:54 PM
Axle is clunky/not spinning smoothly, is...
Yesterday 12:06 PM
replacement chain
Yesterday 11:35 AM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
81 posts
no avatar 2. CharleyFarley
23 posts
no avatar 3. Papa Dom
10 posts
no avatar 4. Painkiller
9 posts
no avatar 5. RoadRacer2020
7 posts