Can’t get a crown race to set
09-23-20, 05:16 PM
#26
Me duelen las nalgas
Join Date: Aug 2015
Location: Texas
Posts: 13,513
Bikes: Centurion Ironman, Trek 5900, Univega Via Carisma, Globe Carmel
Mentioned: 199 Post(s)
Tagged: 0 Thread(s)
Quoted: 4559 Post(s)
Liked 2,802 Times
in
1,800 Posts
11-05-20, 03:29 PM
#27
Senior Member
Thread Starter
Join Date: Feb 2017
Location: Maryland
Posts: 52
Bikes: '73 Raleigh Competition, Guru Sidero, Soma Groove, Smolenski,
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 15 Post(s)
Likes: 0
Liked 15 Times
in
9 Posts
So, I am sure everyone her is DYING to figure out what happened. Kidding, I am sure most of you have forgotten.
But, to add to the internet base of knowledge, I figured out the problem.
I bought a new set of calipers that are digital and more accurate and re-measured everything. Turns out, the crown race seat on the fork is 27mm, not 26.4 and is therefore the crux of the issue. The top and bottom cups are 30.2, so normal ISO there and the threads are 1"x24tpi, so also normal.
The entire headset is ISO normal except the crown race, which is 27mm. I slipped the original on with a PVC pipe with absolutely no issue. The frame and fork are happily re-married using the original headset. I wanted to use a modern sealed bearing headset because they are way easier to deal with, but it looks like for this one, it's the original or nothing.
Thanks for everyone's help.
But, to add to the internet base of knowledge, I figured out the problem.
I bought a new set of calipers that are digital and more accurate and re-measured everything. Turns out, the crown race seat on the fork is 27mm, not 26.4 and is therefore the crux of the issue. The top and bottom cups are 30.2, so normal ISO there and the threads are 1"x24tpi, so also normal.
The entire headset is ISO normal except the crown race, which is 27mm. I slipped the original on with a PVC pipe with absolutely no issue. The frame and fork are happily re-married using the original headset. I wanted to use a modern sealed bearing headset because they are way easier to deal with, but it looks like for this one, it's the original or nothing.
Thanks for everyone's help.
11-05-20, 05:21 PM
#28
Phyllo-buster
Join Date: Jan 2010
Location: Nova Scotia
Posts: 8,844
Bikes: roadsters, club bikes, fixed and classic
Mentioned: 133 Post(s)
Tagged: 0 Thread(s)
Quoted: 2297 Post(s)
Liked 2,047 Times
in
1,253 Posts
11-05-20, 08:22 PM
#29
www.theheadbadge.com
Join Date: Sep 2005
Location: Southern Florida
Posts: 28,510
Bikes: https://www.theheadbadge.com
Mentioned: 124 Post(s)
Tagged: 0 Thread(s)
Quoted: 2420 Post(s)
Liked 4,381 Times
in
2,090 Posts
More than a few of Raleigh's lightweights (Super Course, Grand Prix) used a slightly gussied up variant of the loose bearing Raleigh headset, so it stands to reason the lower raceway was shared with the Sports - even if not all the time. #BecauseRaleigh
-Kurt
__________________
