Cyclocross Fork Brake Boss Repair
05-18-21, 06:05 PM
#1
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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
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..hey bob.. where are you located?
05-18-21, 07:24 PM
#3
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Originally Posted by tyler_fred
..hey bob.. where are you located?
05-18-21, 08:04 PM
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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!
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Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.
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05-18-21, 08:06 PM
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Originally Posted by con50582
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
__________________
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
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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
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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.
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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.
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05-18-21, 10:37 PM
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^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.
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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
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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
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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
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Originally Posted by gugie
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.
05-19-21, 07:30 AM
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You can still get Mafac bosses
05-19-21, 08:15 AM
#14
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Anyone know someone that brazes?
05-19-21, 08:46 AM
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Originally Posted by con50582
Anyone know someone that brazes?
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/
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05-19-21, 01:05 PM
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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!
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05-19-21, 01:28 PM
#17
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Thanks for all the advice. Gugie is going to take care of me.
This forum is awesome.
This forum is awesome.
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06-12-21, 09:30 AM
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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!!
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06-12-21, 01:46 PM
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Originally Posted by scarlson
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!!
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06-13-21, 10:03 AM
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Originally Posted by con50582
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.
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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
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Originally Posted by gugie
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.
Originally Posted by con50582
Do you replace bosses?
Originally Posted by con50582
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
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06-13-21, 12:17 PM
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Originally Posted by gugie
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.
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