Cyclocross Fork Brake Boss Repair
05-18-21, 06:05 PM
#1
Junior Member
Thread Starter
Cyclocross Fork Brake Boss Repair
I have a steel cyclocross fork from a diamant. The brake boss is bent and the stud is loose.
Everyone has a “guy” but I don’t have welder.
Anyone have someone that can do these brazes?
Thanks
Bob
Everyone has a “guy” but I don’t have welder.
Anyone have someone that can do these brazes?
Thanks
Bob
05-18-21, 06:30 PM
#2
Senior Member
Join Date: Nov 2010
Location: Magnolia State, 100° with 110% humidity
Posts: 1,230
Bikes: American, Italian, and Japanese.. in no particular order.
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 350 Post(s)
Liked 276 Times
in
128 Posts
..hey bob.. where are you located?
05-18-21, 07:24 PM
#3
Junior Member
Thread Starter
05-18-21, 08:04 PM
#4
Senior Member
Join Date: Jun 2010
Location: Medford MA
Posts: 2,089
Bikes: Ron Cooper touring, 1959 Jack Taylor 650b ladyback touring tandem, Vitus 979, Joe Bell painted Claud Butler Dalesman, Colin Laing curved tube tandem, heavily-Dilberted 1982 Trek 6xx, René Herse tandem
Mentioned: 80 Post(s)
Tagged: 0 Thread(s)
Quoted: 964 Post(s)
Liked 1,451 Times
in
723 Posts
Wouldn't cost much to mail the fork to @gugie , forum member who does this sorta thing all the time!
I'd normally say I'd do it, but currently I'm swamped with other duties!
I'd normally say I'd do it, but currently I'm swamped with other duties!
__________________
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
Likes For scarlson:
05-18-21, 08:06 PM
#5
Team Beer
Join Date: Apr 2004
Location: Sacramento CA
Posts: 6,339
Bikes: Too Many
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 114 Post(s)
Liked 159 Times
in
104 Posts
A photo would really help determine how to fix it. I'm a hobby builder as well and could possibly fix it.
__________________
I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
05-18-21, 08:13 PM
#6
Junior Member
Thread Starter
The left boss as you look at it is bent. The stud wiggles.
It is Reynolds 531 according to Eddy Martens of Martenelly, the maker of the frame.
05-18-21, 09:35 PM
#7
Bike Butcher of Portland
Join Date: Jul 2014
Location: Portland, OR
Posts: 11,637
Bikes: It's complicated.
Mentioned: 1299 Post(s)
Tagged: 0 Thread(s)
Quoted: 4679 Post(s)
Liked 5,797 Times
in
2,282 Posts
If the post isn't bent, just brazing it back would do the trick, as long as the posts were jigged in place.
If not, removing and replacing the bosses would be advised.
If not, removing and replacing the bosses would be advised.
__________________
If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.
If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.
05-18-21, 10:37 PM
#8
Team Beer
Join Date: Apr 2004
Location: Sacramento CA
Posts: 6,339
Bikes: Too Many
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 114 Post(s)
Liked 159 Times
in
104 Posts
^Completely agree with the statement above. If they need to be replaced it would be easier to replace both and move them to modern spacing (80mm) to open up your brake choices. Also, you do understand that the paint will need to be removed.
__________________
I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
05-18-21, 11:16 PM
#9
Junior Member
Thread Starter
I am good with just brazing it. But I think the left one may be bent. Also good with removing it and installing a new one. I don’ think the fork is bent but if so now is a good time to straighten it. It will have Mafacs put back on it.
Understand the paint. I did the paint myself with a rattlecan. I can repaint the fork.
Do you guys know of anyone that could do the repair.
Understand the paint. I did the paint myself with a rattlecan. I can repaint the fork.
Do you guys know of anyone that could do the repair.
05-18-21, 11:42 PM
#10
Senior Member
a possibly helpful suggestion: find out if there is an established Maker-Space nearby; there's likely to be someone with a frame jig or some knowledge of how to braze properly.
05-19-21, 04:53 AM
#11
Junior Member
Thread Starter
05-19-21, 06:32 AM
#12
Senior Member
Join Date: Jan 2004
Location: Madison, WI USA
Posts: 6,154
Mentioned: 50 Post(s)
Tagged: 0 Thread(s)
Quoted: 2363 Post(s)
Liked 1,749 Times
in
1,191 Posts
05-19-21, 07:30 AM
#13
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,696 Times
in
2,517 Posts
You can still get Mafac bosses
05-19-21, 08:15 AM
#14
Junior Member
Thread Starter
Anyone know someone that brazes?
05-19-21, 08:46 AM
#15
Senior Member
Join Date: Oct 2005
Location: Upper Left, USA
Posts: 1,915
Mentioned: 50 Post(s)
Tagged: 0 Thread(s)
Quoted: 634 Post(s)
Liked 444 Times
in
298 Posts
Any frame builder can take care of this. Google is your friend here. I googled and found two in Georgia. There are probably more.
https://zukascycles.com/About.html
Deep South Bicycle Company
A fork is pretty easy to ship so you could send it to most any frame builder to have it fixed. Here's a list (probably not comprehensive) of framebuilders in the US:
https://theframebuilders.com/list/
https://zukascycles.com/About.html
Deep South Bicycle Company
A fork is pretty easy to ship so you could send it to most any frame builder to have it fixed. Here's a list (probably not comprehensive) of framebuilders in the US:
https://theframebuilders.com/list/
Likes For tricky:
05-19-21, 01:05 PM
#16
Senior Member
Join Date: Sep 2009
Location: EagleRiver AK
Posts: 1,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 60 Times
in
33 Posts
If the boss is not terribly bent and can be re-used, you can likely find a local (non-framebuilder) welder do the fix. Get a small piece of flat bar steel and drill 2 holes at the same spacing of the 2 boss centers so that you can use the stud bolts to make a simple jig to connect both studs together. The alignment of the loose stud will then be set by the unbroken boss (unless the stud is really bent out too far). With the bosses jigged together for alignment, most any semi-competent welder will be capable of brazing the stud back onto the boss. You might be able to find a local automotive machine shop with welding capability to take it on, all of about a 5 minute job. Once the stud is re-brazed, it alignment/bend is still out then you can likely use a crescent wrench of the stud to tweak it back if needed.
Rest of the vintage CX build looks great!
Rest of the vintage CX build looks great!
Likes For GrayJay:
05-19-21, 01:28 PM
#17
Junior Member
Thread Starter
Thanks for all the advice. Gugie is going to take care of me.
This forum is awesome.
This forum is awesome.
Likes For con50582:
06-12-21, 09:30 AM
#19
Senior Member
Join Date: Jun 2010
Location: Medford MA
Posts: 2,089
Bikes: Ron Cooper touring, 1959 Jack Taylor 650b ladyback touring tandem, Vitus 979, Joe Bell painted Claud Butler Dalesman, Colin Laing curved tube tandem, heavily-Dilberted 1982 Trek 6xx, René Herse tandem
Mentioned: 80 Post(s)
Tagged: 0 Thread(s)
Quoted: 964 Post(s)
Liked 1,451 Times
in
723 Posts
Totally new fork? Or did he just fill up those voids under the edges of the crown? Either way, looks like great work and a quick turnaround time!!
__________________
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
06-12-21, 01:46 PM
#20
Junior Member
Thread Starter
Likes For Jimbo1983:
06-13-21, 10:03 AM
#23
Bike Butcher of Portland
Join Date: Jul 2014
Location: Portland, OR
Posts: 11,637
Bikes: It's complicated.
Mentioned: 1299 Post(s)
Tagged: 0 Thread(s)
Quoted: 4679 Post(s)
Liked 5,797 Times
in
2,282 Posts
gugie got this thing right. A true craftsman and I highly recommend his help if you need a torch with the artist/mechanical knowledge to get you right. Cant thank him enough.
Looks like you did a great job matching the paint, would love to know details. Did you go the color-match at an automotive paint place route? Rattle can yourself? Looks like you found the correct decals as well, did you clearcoat?
Cantilever posts are pretty easy to braze on once you get the correct miter and use a jig. I've got a fancy Anvil model, but you can get good results with a DIY scrap metal method as well.
__________________
If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.
If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.
06-13-21, 11:16 AM
#24
Senior Member
Join Date: May 2012
Location: Point Reyes Station, California
Posts: 4,528
Bikes: Indeed!
Mentioned: 92 Post(s)
Tagged: 0 Thread(s)
Quoted: 1507 Post(s)
Liked 3,477 Times
in
1,132 Posts
gugie got this thing right. A true craftsman and I highly recommend his help if you need a torch with the artist/mechanical knowledge to get you right. Cant thank him enough.
Brent
Likes For obrentharris:
06-13-21, 12:17 PM
#25
Junior Member
Thread Starter
Thanks for the kind words!
Looks like you did a great job matching the paint, would love to know details. Did you go the color-match at an automotive paint place route? Rattle can yourself? Looks like you found the correct decals as well, did you clearcoat?
Cantilever posts are pretty easy to braze on once you get the correct miter and use a jig. I've got a fancy Anvil model, but you can get good results with a DIY scrap metal method as well.
Looks like you did a great job matching the paint, would love to know details. Did you go the color-match at an automotive paint place route? Rattle can yourself? Looks like you found the correct decals as well, did you clearcoat?
Cantilever posts are pretty easy to braze on once you get the correct miter and use a jig. I've got a fancy Anvil model, but you can get good results with a DIY scrap metal method as well.
Easiest vintage install of cantis ever after your adjustment to boss placement and for the first time the whole pad touches. Should have done this years ago.
Likes For con50582: