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Questions tagged [framebuilding]

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

11
votes
1answer
630 views

How to attach cable mounting points to a bicycle frame?

I have a frame-building project that is near completion: An old 90ies steel MTB frame was cut, and converted into a frame for a cargo bike. In my enthusiasm, I have overlooked one detail: The ...
4
votes
3answers
1k views

Is it possible to rebuild a a steel bike frame (to make it lighter) by welding aluminum tubes

I have an old (80's I guess) road bike, it is heavy, I'd like to make lighter. is it posible to cut and replace the tubes on the frame by welding aluminum ones?
3
votes
2answers
160 views

Why aren't vertical dropouts truly vertical?

Making some custom rear dropouts (vertical) for a project (nonstandard bike, they must be custom) and as I look to dropout examples, I notice that "vertical" dropouts never seem to have the slots ...
1
vote
1answer
69 views

Is there a non-proprietary standard for oval seat-tube/post?

I see Pinarello Dogma and Gan S frames have a proprietary seatpost/seattube combination, which don't have a circular section. An advantage of that design in my opinion is that it's impossible to have ...
3
votes
1answer
138 views

How to evaluate different alloy types used for bicycle frames?

Only certain alloys are used for bicycle frames besides other materials like carbon fibres (at least for the mass market). I often stumble over aluminium alloy 6061 and 7005 (and I think I saw 8004 ...
5
votes
2answers
257 views

tall bike build

Hi everyone just a silly question. I have built a tall bike which is a wee project at the moment. I live in a hilly area in Scotland and having gone down a hill at 25 mpg (40 km/h) on the beast. I ...
12
votes
2answers
2k views

Feasibility of bike frame design by a layperson

I'm sure for many bike builders, their ultimate dream bike starts with a frame that they designed themselves. And herein lies the problem: it seems that modern means of frame production (e.g., ...
1
vote
1answer
172 views

Chain contact on rear triangle

Hi can anyone help with some advice. I have built up a 2007 specialized big hit 2 and fitted it with a 32t narrow wide chain ring as that is what I've been used to riding. It rides great it handles ...
6
votes
2answers
2k views

Why almost every custom framebuilder builds steel bikes, but not many work with aluminum?

I know it's easier and cheaper to work with steel, but is it THAT MUCH easier and cheaper?
2
votes
1answer
223 views

Crankset fitting issues

May sound like a dumb question bit here goes. Is it possible to run a 68/83 hollowtech crankset on a frame designed for 68/73? I can see the crankset fitting without issue as the crank axle is the ...
7
votes
2answers
1k views

Can I fit a modern internally geared hub on an old bike ?

I have an old Hercules frame that I have no use for but don't want to get rid of - I am in need of a new "town" bike for running around on, however I need something practical with a nice gear range... ...
2
votes
2answers
145 views

Seat stay width issues

Hi I currently ride a decent spec 2003 mongoose full suspension but I find that the seat stay is slightly too narrow to run my maxxis high roller 2 2.3 tyre without it rubbing on the frame. In theory ...
4
votes
1answer
2k views

What are the differences between Columbus Tubings?

I'm just wondering why there are seven kinds of tube sets by Columbus (or Reynolds). There's XCr, Spirit, Life, Zona, Max, SL, and Cromor. I recently had a frame made using the Cromor tubeset; mainly ...
2
votes
1answer
270 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
votes
2answers
730 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 ...
0
votes
2answers
656 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?
1
vote
1answer
133 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 ...
5
votes
1answer
286 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
votes
1answer
457 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 ...
2
votes
1answer
2k 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 ...
2
votes
4answers
21k 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 ...
6
votes
1answer
6k 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 ...
3
votes
4answers
982 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
votes
1answer
1k 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 ...
1
vote
2answers
2k 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 ...
7
votes
3answers
14k 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 ...
11
votes
3answers
12k 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 ...
4
votes
1answer
4k 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 ...
3
votes
5answers
907 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.
3
votes
3answers
849 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 ...
10
votes
3answers
26k 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?
5
votes
1answer
710 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 ...
10
votes
2answers
7k views

Equipment needed for Frame-building?

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