Building the frame of a bicycle, starting with just a pile of tubes.

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0answers
4 views

Fork trail vs chainstay length in steering

Is fork trail or chainstay length is a bigger determinant in the overall steering of the bike? Consider an arbitrary frame that I think is steers too slowly. I'm going to rebuild it because I want a ...
6
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2answers
118 views

Lugged carbon frame repair

In broad terms, I'm wondering if it is possible to repair a high quality lugged carbon frame, say a Colnago C60, that has been cracked in the top and/or down-tube. Normally once a carbon frame has a ...
6
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3answers
8k views

MIG Welds vs Brazing for simple bike hacks

Given that frames are generally brazed, not welded and given that MIG welding will work on simple bike hacks what are the downsides of MIG welding these hacks? For example, I would like to make a ...
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2answers
147 views

What are the advantages of having a aluminium frame? [duplicate]

are there any advantages that an aluminium body brings to the tables over carbon frames?
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1answer
55 views

DIY Bamboo bike? [duplicate]

I am wondering whether or not I can build my own bike. I was thinking of buying some steel lugs or maybe carbon ones or whatever off the internet, and a steerer tube too, and was hoping I could ...
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4answers
4k views

How to repaint a Carbon bike frame?

I have recently purchased a Specialized Roubaix SL4 Elite Disc carbon frame bicycle - But I am not particularly happy with the colour. It is charcoal and white. I like to have a brighter colour. Is ...
5
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1answer
3k views

Just found a vintage Sears & Roebuck 'Ted Williams' Free Spirit 3 wheeler. Can I modernize it?

It's been in my girlfriends back yard for years and I'm under the impression that it's a pretty uncommon bike because I can't find any information on it. Her stepfather spray painted a camo pattern on ...
2
votes
1answer
320 views

Can a bike frame be retrofitted with internal cable routing without Disassembly?

Would I be able to have a local framebuilder retrofit an existing steel mountain bike frame to install internally routed cable guides on the top tube without disassembling the frame? I would probably ...
5
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1answer
133 views

How is a frame designed for an easy step-thru?

My question is very specific towards bikes which have a curved top-tube. How is it decided that a particular height of the top tube above the ground for a set of people in a certain height range is ...
6
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1answer
424 views

3D printing frames?

Are there any technical limitations that make 3D printing frames impractical? And, if it is just a matter of time before our technology is able to overcome any limitations (like manufacturing ...
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3answers
13k views

How do I calculate the diameter of a chainring from the number of teeth?

Simply knowing the number of teeth on a chainring can we determine an accurate diameter?
8
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3answers
5k views

Why offset the rear rim to the hub and not the hub in the frame?

I'm currently reading The Bicycle Wheel by Jobst Brandt, and I'm reading all of the issues with offsetting the rear rim toward the drive side of the hub... Asymmetry in a rear wheel built for a ...
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4answers
597 views

What are the advantages of a custom frame for a touring bike?

I'm building a new bike for touring while traveling, so I want a break-apart frame with S&S couplers, like the Salsa Vaya Travel, or another steel touring frame retro fit with couplers. I want a ...
2
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1answer
612 views

building a cargo trike (bakfiets): steel thickness

I'd like to build a "bakfiets"; a cargo-trike with the box in front. I've found several resources, but none of them talk about the framebuilding material. What is are my material options; steel? what ...
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vote
2answers
992 views

top tube angle on steel and carbon road bikes

You generally see the top tube on steel bikes being parallel to the ground, whereas on a lot of carbon bikes it's angled. Why is that? (my observations are obviously limited, but it seems like a ...
3
votes
3answers
571 views

Bottom bracket for framebuilding

This question has got me hugely excited about building a bamboo bike. I've found some instructions and tips here and here. I plan to find/buy an old bike to use as a donor. I think I'll use the head ...
4
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1answer
3k views

What would be the “definitive” formula to calculate chainstay length from sprocket size, chainring size and number of chain links?

Before I started to write this answer, I thoroughly read this question, its answers and comments: How do I calculate the diameter of a chainring from the number of teeth? So, my question tries to ...
2
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5answers
773 views

Where can I buy lugs for a classic roadster frame geometry?

The title says it all. I want to build my own frame and need lugs that will fit the roadster (e.g. Raleigh Tourist) geometry.
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2answers
5k views

Equipment needed for Frame-building?

Since misunderstood question here, a new question with narrow scope. So what are equipments need for frame-building?
5
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1answer
494 views

What tools are required to begin building a frame?

What tools are required to begin building a frame? Are there DIY substitutes for any of them? Are there things that aren't requirements, but simplify the process enough to be worth the cost? Aside ...