Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-06-10, 02:17 AM   #1
dnomel
Senior Member
Thread Starter
 
Join Date: Jan 2010
Bikes:
Posts: 111
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
cold setting experiences?

I just worked on bending the rear end of a misaligned frame. From what I've read of this it didn't go as expected. Before using the sheldon brown 2x4 method I just tried pulling apart at the dropouts with my hands and was so surprised to see it go from 123mm to 132mm that I thought I'd measured wrong. I pushed it back again with my hands, not too hard, and it was back around 123mm. After some fiddling with the 2x4 I did get things pretty centered and at about 130mm, but considering the lower than expected amount of force and "springiness" to get it there I'm wondering if this is normal or if it indicates damage and if I can expect it to stay in this alignment. The frame has sv980 stamped in the main tubes and I think it's a pugeot race bike.
dnomel is offline   Reply With Quote
Old 08-06-10, 05:30 AM   #2
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
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
Posts: 30,830
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 859 Post(s)
It's probably fine. Bike rear stay vary tremendously bike to bike with some being very stout and some more pliable. There's also a difference in the bending properties of various metals and tempers. Mild steels spring a very short amount before bending, alloy steels can be very springy, resisting bending and returning to original dimension even after flexing a decent distance, yet once they start bending it's easy to go too far.

Once you've got it where you want it, it'll stay that way until there's enough force to exceed it's flexible range and bend it anew.

BTW- next time around try to control the way you cold set (bend, in fancy terms) the stays so only one moves at a time. Then you can take each half the distance, and make sure the center line is maintained.
__________________
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   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 03:15 PM.