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 07-19-14, 02:29 AM   #1
Welshspud
Newbie
Thread Starter
 
Join Date: Jul 2014
Bikes:
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Headsets

Hi,

Wonder if someone can help.
I recently purchased a vintage Raleigh bike to strip, re paint, upgrade a few components and re build.
As this would be my first time to build a bike, In the process of taking everything off the bike I made notes of locations etc. the old headset was completely rusted, so i bought a nice new shinny one. When I opened the box I noticed that the depth of one cup is slightly smaller than the other. As u can guess I didn't notice this when stripping the bike. And the old headset is the same. Can someone advise if there is a specific way the cups need to be. Ie bigger one on top, smaller one on bottom, or vise versa
Welshspud is offline   Reply With Quote
Old 07-19-14, 03:53 AM   #2
dabac
Senior Member
 
Join Date: Mar 2008
Bikes:
Posts: 5,361
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
It's all in the fit. But usually the smaller goes on top so that it can be overhung by what's technically the cone.
So if all else fails, start with the identifiable bits - like the crown race - to see which parts goes together.
dabac is offline   Reply With Quote
Old 07-19-14, 11:23 AM   #3
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: 29,427
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 95 Post(s)
Think of cones and cups.

Most bicycle bearings are "angular bearings" using a conical part, and a cup shaped part with the balls trapped between. Now look at your headset. There's only one crown race (probably still on the fork). It has to mate with a cup, usually with an extending skirt coming around the side to enclose it.

Like wise, there's only one threaded bearing race for your fork. Depending on the headset, it might be a cone or a cup (both designs exist), but it needs to mate with a top of frame bearing of the opposite design. If the threaded race is a cone, there's usually a short skirt around the outside which will fir around the upper frame cup as a weather shield.

I hope that helped.
__________________
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 online now   Reply With Quote
Old 07-19-14, 11:30 AM   #4
arex
Abuse Magnet
 
arex's Avatar
 
Join Date: Jun 2012
Location: Colorado
Bikes: '91 Mtn Tek Vertical, '74 Raleigh Sports, '72 Raleigh Twenty, '09 Surly Karate Monkey
Posts: 1,486
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
If it's an old Raleigh, be sure the threads on the new headset are correct before trying to install it. Most old Raleighs use 26 threads/inch, where standard headsets are 24 threads/inch. The new headset will start to spin on, but if it begins to bind AT ALL, don't go any further or you'll tear up the threads.
arex is offline   Reply With Quote
Old 07-19-14, 11:52 AM   #5
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: 29,427
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 95 Post(s)
+1,000,000

I overlooked that you mentioned buying new, and posted based on the assumption that you were simply reinsstalling the original.

Old Raleighs used a 26tpi headset, most headsets sold today are 24tpi. read the box to know what you bought, and as mentioned, if it threads 2-3 turns then stiffens up YOU HAVE THE WRONG THREAD.
FBinNY is online now   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 03:18 PM.