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Retrofitting Added Functionality to an existing frame

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Retrofitting Added Functionality to an existing frame

Old 04-26-19, 10:07 AM
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prairiepedaler
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Retrofitting Added Functionality to an existing frame

I have a couple of steel frames that are suitable size and hold future potential for use. I like a kitchen sink bike with a tonne of "fastenability"; threaded braze-on laden frames for attaching stuff to. These steel frames could use a repaint so should it not be possible to walnut hull the frames, drill them in the appropriate spots then weld in pre-made threaded attachment points? I'm looking at adding more water bottle mounts, mid-fork blade mounts, seat stay mounts etc. Maybe tack on some spoke holders as well. While I'm at it, the cantilever braze-ons feature posts which are not allen key replaceable. Those too could be swapped for modern ones. Thoughts?
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Old 04-26-19, 10:38 AM
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yes, framebuilders do this all the time
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Old 04-26-19, 11:54 AM
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Thanks Unter, glad to hear confirmation. You're into framebuilding and mods, have you any examples of this type of retrofitting work? I'm not a welder, but know how to solder and am reasonable handy. I might try my hand at the retrofitting process in the future on a pooched frame for practice. There is only one guy locally who does any sort of frame work:

https://www.cycleexif.com/lt-wiens-road-bike

https://ltwiens.com/

I'm too frugal to pay cha-ching coin for some minor additions to an old frame and if I were to spend anything substantial it would be on a complete custom one built just-so. One can buy several used bikes for the price of a little welding.
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Old 04-26-19, 12:43 PM
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I'm bad about taking pictures. There really is no difference between adding them to an existing frame and a new frame other than removing paint. On an existing frame I use a torch to burn the paint and then sand the residue off.

Just off the top of my head, I have added cable stops, rack mount bosses, fender eyelets and water bottle bosses to existing frames.
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Old 04-26-19, 01:21 PM
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Think braze not weld.......ask the guys who really know, but for adding threaded brazeons like for water bottles you might be able to use a MAPP torch.....it did work for me for removing cable guides...... not sure Mapp wold work for day adding threaded eyelets to dropouts for racks and fender mounts
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Old 04-26-19, 02:16 PM
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A MAPP gas torch and 56% silver will work fine for braze ons, like bottle bosses and cable guides. I still use it occasionally when my propane tank isn't hooked up to my Oxy/Propane setup.(sometimes its on the BBQ grill and I don't feel like going to get it)
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Old 04-27-19, 05:06 PM
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Talk to @gugie. He is known for his mods.

Where are you located?
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Old 04-27-19, 06:21 PM
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Did someone ask for pictures?
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Old 04-27-19, 09:17 PM
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Originally Posted by CliffordK View Post
Talk to @gugie. He is known for his mods.

Where are you located?
Hi Cliff, thanks for that reference. I'm up in Winnipeg the Windy.
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Old 04-29-19, 06:31 PM
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Originally Posted by gugie View Post
Wowsers! Some first rate work there, Gug. That's the spirit.
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Old 04-29-19, 06:45 PM
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I had this done to an old Peugeot.







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Old 04-30-19, 02:00 PM
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I have that same coffee table!
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Old 04-30-19, 02:18 PM
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I have some mods planned shortly.

I think I'll stick to 25mm or 28mm tires, so no cantis, etc.

However, I've been wondering a bit about seat stay & fork rack mounts (and perhaps dropout mods).

A couple of questions I've been mulling over. First of all, I'd hate to be 500 miles from home and experience a critical failure. So, any solution has to be STRONG & DURABLE.

One question is whether one is better off with those spool shaped attachments like @Aubergine used, vs drilling and brazing the tubes, using water bottle bosses for the rack mounts.

Welding the dropouts?
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Old 04-30-19, 04:35 PM
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spool mounts are probably stronger than water bottle bosses. I'm not convinced about braze on dropout eyelets for a heavy rack though.
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Old 05-07-19, 05:43 PM
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I'd probably prefer to use spool mounts on a fork instead of drilling it for insert threading, although I don't like the look as much. Several mirror imaged pairs along each blade would certainly increase flexibility of attachment o' stuff. Ritchey used to offer a heavy duty rear dropout, and that's about the only thing I do remember about frame parts. If I could find pairs of those that fit, they might be a replacement option on a frame sometime.
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