Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

Threaded Headset Question (again)

Notices
Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

Threaded Headset Question (again)

Old 04-01-22, 09:04 PM
  #1  
Shinkers
Senior Member
Thread Starter
 
Join Date: Jan 2014
Location: Utah
Posts: 754

Bikes: '88 Trek 1200, '91 Trek 1400

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 119 Post(s)
Liked 7 Times in 5 Posts
Threaded Headset Question (again)

Sorry, one more headset question.

How much of a gap should be between the top of the lock nut and the top of the steerer? I can stack either 6mm or 8mm of spacers under mine, and the 6mm is just barely bottomed out, and 8mm leaves a 2mm gap.

Thanks.
Shinkers is offline  
Old 04-01-22, 09:09 PM
  #2  
Soody
Senior Member
 
Soody's Avatar
 
Join Date: Mar 2015
Location: New Zealand
Posts: 994

Bikes: Gunnar, Shogun, Concorde, F Moser, Pete Tansley, Rocky Mtn, Diamant, Krapf, Marin, Avanti, Winora, Emmelle, Ken Evans

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 251 Post(s)
Liked 338 Times in 190 Posts
As little as possible, while still allowing the lock nut to be tightened enough.

Last edited by Soody; 04-01-22 at 09:58 PM.
Soody is offline  
Old 04-02-22, 06:43 AM
  #3  
jamesdak 
Senior Member
 
Join Date: Aug 2010
Location: Utah
Posts: 8,001

Bikes: Paletti,Pinarello Monviso,Duell Vienna,Giordana XL Super(2)Lemond Maillot Juane (2) & custom,PDG Paramount,Serotta CSI,Fuji Opus III,Davidson Impulse,Pashley Guv'nor,Evans,Fishlips,Prologue TT,Y-Foil,Softride, Tetra Pro, CAAD8 Optimo,Klein Quantum II

Mentioned: 143 Post(s)
Tagged: 0 Thread(s)
Quoted: 2052 Post(s)
Liked 3,046 Times in 1,218 Posts
Seems like the 8mm should be the ticket then. Sometimes it's hard to tell when the locknut is bottoming out until the headset keeps coming loose on rides. Went through that on one of mine and finally just added another thin spacer to fix it. As long as most of the the treads are engaging I can't see how you should have any problem.
__________________
Steel is real...and comfy.
jamesdak is offline  
Old 04-02-22, 06:51 AM
  #4  
Moe Zhoost
Half way there
 
Moe Zhoost's Avatar
 
Join Date: Sep 2015
Location: North Carolina
Posts: 2,849

Bikes: Many, and the list changes frequently

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 945 Post(s)
Liked 802 Times in 480 Posts
You should aim for a 2 mm gap.
Moe Zhoost is offline  
Old 04-02-22, 08:27 AM
  #5  
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Posts: 24,087

Bikes: Several, mostly not name brands.

Mentioned: 147 Post(s)
Tagged: 0 Thread(s)
Quoted: 3198 Post(s)
Liked 2,509 Times in 1,476 Posts
If the locknut bottoms out on the steer tube, you need a thicker spacer. There needs to be a gap of some sort between the locknut and the top of the steer tube to properly set bearing preload. As long as at least three threads on the locknut are engaged, you should be fine.
JohnDThompson is offline  
Likes For JohnDThompson:

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 or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.