Bicycle Mechanics - Braze-ons

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View Full Version : Braze-ons


likeacastshadow
09-09-04, 08:20 PM
I was wondering if it is possible to make rear rack braze-ons after the bike is all finished and painted and such, and if so, how? I have a 2003 (I think) Lemond Poprad with eyelets but no braze-ons. It is Reynolds 853 so that means steel. I searched the archives to no avail, could anyone help me out?


Rev.Chuck
09-09-04, 08:34 PM
Installing brazeons means a repaint, you use a torch with 5000+ degree tip. There are rubber coated steel clamps for rack installation that might work for you.

likeacastshadow
09-09-04, 08:50 PM
Installing brazeons means a repaint, you use a torch with 5000+ degree tip. There are rubber coated steel clamps for rack installation that might work for you.

How much would an installation, minus the repaint, be?

Are there links to a site describing the process? I have a torch handy, what else would I need?


sydney
09-09-04, 08:57 PM
I have a torch handy, what else would I need?
The know-how to use it?

likeacastshadow
09-09-04, 09:06 PM
The know-how to use it?

Done. I meant like what kind of solder to use, and where to get the parts.

larue
09-09-04, 09:12 PM
well you could always save time and look for a rack that doesn't require braze ons.

sch
09-09-04, 09:34 PM
Google search on "bicycle framebuilder supplies" gave a bunch of hits some of
which might be useful. Search on framebuilders would reference some of those
as well. If you are not sure what kind of solder to use it might be best to not
muck up the frame with learn as you go techniques especially as it is unnecessary. Silver solder or brass would be the materials of choice if you find the bits and
want to learn how to attach and then how to repaint frames. Might be better to practice on readily available junker frames first since the cost of the bits you
want to solder on is peanuts. Steve

likeacastshadow
09-09-04, 09:41 PM
Google search on "bicycle framebuilder supplies" gave a bunch of hits some of
which might be useful. Search on framebuilders would reference some of those
as well. If you are not sure what kind of solder to use it might be best to not
muck up the frame with learn as you go techniques especially as it is unnecessary. Silver solder or brass would be the materials of choice if you find the bits and
want to learn how to attach and then how to repaint frames. Might be better to practice on readily available junker frames first since the cost of the bits you
want to solder on is peanuts. Steve

Thanks, Steve. I am reading some of those websites now. I think that about answers my question. Would a local shop be able to do this and not screw it up?

Rev.Chuck
09-09-04, 09:49 PM
Unlikely. We have one of the older shops, three actually, and only the boss and I have torch time and even then it takes a rare case for us to break them out to braze up on something (They are personal not shop equipment) 853 is some thin stuff and you need to be careful with the heat or you end up with a really big flute.

TechJD
09-09-04, 10:02 PM
brazeing take more than a regular torch it has to have a 2ed tank of O2 or something
to make it hoter
and then you need braze rods
and some experaince useing them or you will just make a big mess

likeacastshadow
09-09-04, 10:07 PM
Unlikely. We have one of the older shops, three actually, and only the boss and I have torch time and even then it takes a rare case for us to break them out to braze up on something (They are personal not shop equipment) 853 is some thin stuff and you need to be careful with the heat or you end up with a really big flute.

That would narrow down my options a bit then. I don't think I trust myself doing this for the first time on an expensive bike, much less my own. On one of the clamps you mentioned previously, 1) where does it attach, and 2) are they prone to shaking loose with riding? Seems to me like it is a sketchy deal. Also, how much do they run?

Retro Grouch
09-10-04, 04:01 AM
When you buy your rack, most of them will include a pair or two of "P" clamps. Most bike shops will have a drawer full of them too.

Rev.Chuck
09-10-04, 06:48 AM
WHat Retro grouch said. It is a steel band with a screw thru it and the rack. Onve you put it on there it is not coming off with out some tools.

John E
09-10-04, 08:22 AM
Not wanting to damage my paint, I use rubber-coated clamps to hold the Blackburn MTN rack on my Schwinn. I positioned them on the seat stays so that the one on the right rests on the chain hanger and cannot slip downward.

ComPH
09-10-04, 03:15 PM
The brazing is fairly trivial, you can get the brazeons here: http://store.airbomb.com/ba/asp/ic.FS1033/ab/Itemdesc.htm, and you can use silver rod/paste, which you can get here: http://www.ramweldingsupply.com/products-list.mcic?c=4#NAV_82. the silver doesn't need such a high heat. Simple $35 MAPP torch will do just fine, but you will certainly mess up the paint job big time. Some brazing basic can be found here: http://www.handyharmancanada.com/TheBrazingBook/contents.htm#Index. Simple old clamps from a hardware store with cut piece of innertube underneath and little improvisation with couple of parts from the hardware store will get you there just fine, or you can buy rubber coated/plastic coated clamps as well here: http://www.mcmaster.com/.