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  1. Replies
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    Agreed. That looks like ~50 mm tubing, with...

    Agreed. That looks like ~50 mm tubing, with likely heavy walls.
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    660

    It's hard to say really, I think everyone is...

    It's hard to say really, I think everyone is speculating to some extend. I'm sure it would be ridable, but it might not be best for spirited riding and/or climbing hills, which also increases wheel...
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    So it's a roadster with a long TT it seems....

    So it's a roadster with a long TT it seems. Nothing wrong with roadsters, they are still being ridden and produced in millions. The main problem is that there will be a lot of wheel flop, and this...
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    That Concealex stuff looks nice. Where can you...

    That Concealex stuff looks nice. Where can you get some? I agree that using carbon is a bit overkill and expensive, but it's pretty and not too hard to use (although playing with epoxy is messy). I...
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    Little update. Using wood wasn't going to work...

    Little update. Using wood wasn't going to work easily so I used carbon fibre. I kinda messed up trimming the sides but it's not bad.
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    Generally, you would want a disk-specific fork...

    Generally, you would want a disk-specific fork (heavier blades and special dropouts) if you wanty to use disk brakes. So you would need to decide beforehand. Otherwise it's not a bad idea to get some...
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    EL OS was one of the thinnest gauges tubes as far...

    EL OS was one of the thinnest gauges tubes as far as I known. Frame weight should be around 1700 g. The fork around 700 g. Lightest carbon frames are 800 g, lightest forks 300 g but these tend to be...
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    Very cool, thanks for sharing.

    Very cool, thanks for sharing.
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    Fork crown is Haden and I think the lugs are...

    Fork crown is Haden and I think the lugs are Prugnat. I'd say it's from the late 70s. I haven't seen much of that crown on production frames so this could be a custom?
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    Here it is. 372323 I think that superposing a...

    Here it is. 372323

    I think that superposing a series of narrow strips oriented along the two curves would work. But that seems like a lot of work, I can't figure out a way to do that efficiently....
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    Yeah I'm thinking fibreglass or carbon fibre will...

    Yeah I'm thinking fibreglass or carbon fibre will conform to the shape naturally. Simply rolling the fibres + epoxy should leave a decent finish?
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    Here is a pic. It's cracked and far from flat,...

    Here is a pic. It's cracked and far from flat, but it's not that bad given my meager means (water and rubber bands). There are a few things I can try next.

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    Yeah I gave it a try and indeed the compound...

    Yeah I gave it a try and indeed the compound shape is too much to ask. I'll try to lay a base of narrow strips 90 deg to the wheel axis followed by narrow strips parallel to the axis...
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    Thanks for the suggestions. Yes the Wald mold...

    Thanks for the suggestions. Yes the Wald mold (say that 5 times) has a compound curve. And playing with the veneer it looks likely that it will crack on me. It's about 1 mm thick.

    How about this....
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    Making wooden fenders

    I'd like to make some fenders for 20x2.0'' wheels. I have some oak veneer, a West epoxy slow-cure kit and a Wald fender as a mold. The plan is to laminate the veneer strips on the mold with the...
  16. Historical question. Were lugs used in early...

    Historical question. Were lugs used in early bicycle manufaturing because the only available heat sources were hearths or furnaces? Seems like a nice way to join lightweight tubes given the means....
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    Chainstays and fork legs tend to pull in after...

    Chainstays and fork legs tend to pull in after brazing. It's a good idea to set the OLD wider in the jig.
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    Is that what you mean? 369951 My first...

    Is that what you mean?

    369951

    My first guess for that design would be standover height. But if they make it in different sizes then perhaps it is to accommodate a longer headtube which would...
  19. I think 4130 is heat-treated to some extend; it's...

    I think 4130 is heat-treated to some extend; it's generally normalized and brazing will affect its temper. Even 1020 steel should be affected.

    OP, it seems like money is a big issue. I'd just like...
  20. I don't think the wheelbase influences the...

    I don't think the wheelbase influences the turning radius a lot unless you do sharp turns at slow speeds; at normal speeds the front and rear wheel are generally in plane. 272 mm is not a low BB...
  21. You should get your impression from someone that...

    You should get your impression from someone that has taken a course. I believe there is more than that. The skills are transferable to your home shop but it likely will take some time to figure it...
  22. I think Marinoni (or was is Rossin?) said that...

    I think Marinoni (or was is Rossin?) said that you need to make 1000 frames to get the hang of it. And after 30 000+ frames he mentioned that he is still learning.

    Certainly, it takes a lifetime...
  23. I think it depends. I've met a guy who took the...

    I think it depends. I've met a guy who took the UCI course; his frame was okay (they ran out of time) and he wasn't proficient with the torch when we added braze-ons. Another friend of mine took the...
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    Yes you can cut the stays near the dropout and...

    Yes you can cut the stays near the dropout and file them out, or you can heat them (use flux) and pull them out. You can also use a brush to remove the remaining brass while heating, and then...
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    My experience is that brass flows quite well in...

    My experience is that brass flows quite well in lugs with the right amount of heat. I like that the flux is quite tolerant so you can blast the joint and braze rapidly. 55+ % silver does flow very...
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