Colnago track fork just re-chromed
02-14-23, 05:21 PM
#1
Full Member
Thread Starter
Join Date: Aug 2019
Location: Albuquerque
Posts: 227
Bikes: 1st Track bike: 1978 Speedwell titanium 1st Road bike: 2001 Independent Fabrication Crown Jewel
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
Liked 116 Times
in
65 Posts
Colnago track fork just re-chromed
This is the second fork I've had re-chromed by Jack Trumbull from Franklin Frames in Ohio. Sorry I forgot to take before pics but it had several rust patches and was speckled with rust dots. I think it came out pretty well - he filled in the panto too.
Couple of questions for you guys. I recently posted about a Ciocc track fork - I had dremelled a curve in the bottom of the crown to accommodate a 25c tire. This Colnago crown has a prominent curve with what appear to be tool marks just on that area. Was this curve put in after the crown was cast?
Both crowns have a pin installed. The Ciocc pin is very close to the bottom of the crown. I know pins were used to hold tubes together when welding but what are the pins used for here?
Couple of questions for you guys. I recently posted about a Ciocc track fork - I had dremelled a curve in the bottom of the crown to accommodate a 25c tire. This Colnago crown has a prominent curve with what appear to be tool marks just on that area. Was this curve put in after the crown was cast?
Both crowns have a pin installed. The Ciocc pin is very close to the bottom of the crown. I know pins were used to hold tubes together when welding but what are the pins used for here?
Likes For Biketiger:
02-14-23, 06:08 PM
#2
Senior Member
Join Date: Aug 2017
Location: Germany
Posts: 1,090
Bikes: 80s Alan Super Record, 79' Somec Special, 90s Rossin(?) Columbus Ego Triathlon, previously: Bianchi SBX Reparto Corse (stolen) and so on...
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 391 Post(s)
Liked 813 Times
in
602 Posts
Just a guess but i can imagine being useful for dipping in the crhoming tank. If one would hang it with rope/hook tied to the fork itself it might affect good coverage... but what do I know... we have frame builders and collectors who had things rechromed so expect better answers...
02-16-23, 07:35 AM
#3
Senior Member
The pin is probably left over from the frame building process, IMO
__________________
Check out www.djcatnap.com for articles on vintage Japanese & French bicycle restorations, components and history.
Check out www.djcatnap.com for articles on vintage Japanese & French bicycle restorations, components and history.
Likes For Catnap:
02-16-23, 07:56 AM
#4
Full Member
Thread Starter
Join Date: Aug 2019
Location: Albuquerque
Posts: 227
Bikes: 1st Track bike: 1978 Speedwell titanium 1st Road bike: 2001 Independent Fabrication Crown Jewel
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
Liked 116 Times
in
65 Posts
Obviously the framebuilder installed it. The question Catnap is for what purpose.
02-16-23, 08:31 AM
#5
Senior Member
the tl;dr version is that the pin had a purpose during the manufacture of the frame, but has no purpose any longer.
__________________
Check out www.djcatnap.com for articles on vintage Japanese & French bicycle restorations, components and history.
Check out www.djcatnap.com for articles on vintage Japanese & French bicycle restorations, components and history.
02-16-23, 09:54 PM
#6
Senior Member
Join Date: Jun 2006
Posts: 20,305
Mentioned: 130 Post(s)
Tagged: 0 Thread(s)
Quoted: 3464 Post(s)
Liked 2,831 Times
in
1,997 Posts
Colnago pinned almost all, so did DeRosa and others.
Masi did not.
richard Sachs uses multiple pins, the locations have varied, the goal is to control the connection and avoid correction. Avoid Post brazing alignment.
02-16-23, 10:01 PM
#7
Full Member
Thread Starter
Join Date: Aug 2019
Location: Albuquerque
Posts: 227
Bikes: 1st Track bike: 1978 Speedwell titanium 1st Road bike: 2001 Independent Fabrication Crown Jewel
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
Liked 116 Times
in
65 Posts
pinning joints is a frame building technique to securely hold the tubes in the proper orientation when brazing. this article here has a detailed explanation of how it works: https://www.classiclightweights.co.u...rame-building/
the tl;dr version is that the pin had a purpose during the manufacture of the frame, but has no purpose any longer.
the tl;dr version is that the pin had a purpose during the manufacture of the frame, but has no purpose any longer.
I have seen pins where tubes come together. My Ciocc has a pin in the same spot but closer to the bottom edge of the crown.
02-16-23, 10:37 PM
#9
Full Member
Thread Starter
Join Date: Aug 2019
Location: Albuquerque
Posts: 227
Bikes: 1st Track bike: 1978 Speedwell titanium 1st Road bike: 2001 Independent Fabrication Crown Jewel
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
Liked 116 Times
in
65 Posts
Okay - that makes sense! I wondered about that but when I initially examined the underside of the crown, I didn't recognize that the steerer tube extends all the way down to the bottom of the crown. Thanks for pointing that out 
