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 01-17-10, 01:29 PM   #1
wtgrantham
Senior Member
Thread Starter
 
wtgrantham's Avatar
 
Join Date: Dec 2008
Bikes:
Posts: 169
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Crown race measuring

I am trying to measure the inside diameter on an older crown race and can't find any reference on which place to measure. Obviously on the inside of a press fit crown race you will have a ring that is smaller and the rest is larger. Do you measure the smaller diameter or the larger diameter???
Thanks
wtgrantham is offline   Reply With Quote
Old 01-17-10, 01:47 PM   #2
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You're trying to figure out the diameter of the crown race where it would seat on the fork. That would be the "inside" diameter as such. If you think about it one measurement is clearly useless and one is not.
operator is offline   Reply With Quote
Old 01-17-10, 01:56 PM   #3
Torchy McFlux
Senior Member
 
Torchy McFlux's Avatar
 
Join Date: Sep 2007
Location: Vancouver
Bikes: NOYB
Posts: 1,438
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What?
Inside diameter is the inside diameter. Like this:



This crown race is 26.4mm.
Attached Images
File Type: jpg insidediacr.jpg (33.3 KB, 8 views)
Torchy McFlux is offline   Reply With Quote
Old 01-17-10, 02:16 PM   #4
DaveSSS
Senior Member
 
Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
Posts: 4,987
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've never seen one with two inside diameters, but obviously the smaller would be the one of relevance.
DaveSSS is offline   Reply With Quote
Old 01-17-10, 02:29 PM   #5
wtgrantham
Senior Member
Thread Starter
 
wtgrantham's Avatar
 
Join Date: Dec 2008
Bikes:
Posts: 169
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the replies. The crown race I am measuring is smaller where it seats on the fork than it is the rest of the inner diameter. Like a small ring on the inner diameter. Using the smallest diameter it reads around 26mm (my calipers are not very good) so I assume it is a 26.4
wtgrantham is offline   Reply With Quote
Old 01-17-10, 03:45 PM   #6
wrk101
DRF aka Thrifty Bill
 
wrk101's Avatar
 
Join Date: Jan 2008
Location: The NC Mountains
Bikes: 86 Katakura Silk, 87 Prologue, 87 Cimarron, 14 frame school custom, 73 Paramount
Posts: 19,958
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Accurate digital micrometers are cheap at Harbor Freight and similar. I got mine for under $10. A good investment if you are going to work much on bikes.
wrk101 is offline   Reply With Quote
Old 01-17-10, 06:12 PM   #7
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Bikes: Several, mostly not name brands.
Posts: 16,351
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 53 Post(s)
You dimension "L" in this diagram:

JohnDThompson 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 11:17 AM.