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13
votes
5answers
983 views

Why is it common for cheap bikes to have the frame sawn in half below the saddle?

These days cheap bikes often seem to come with the frame sawn in half below the saddle. What does the manufacturer gain from this design, and why is it associated mostly with cheap, low quality ...
10
votes
6answers
16k views

Carbon bikes make me nervous. Can you ease the tension?

Is it only me, or do Carbon bikes make others nervous! I realize that carbon fibre is strong, but for some reason, having a bike that isn't made out of metal seems like asking for trouble. My main ...
7
votes
4answers
2k views

Why do current, entry-level shimano rear derailers have large-diameter pulleys?

I have seen (and recently bought) entry-level rear derailers from Shimano (Tourney for MTB, 2300 for road bike), and I keep wondering why they are making these parts with such large pulleys. I don't ...
6
votes
3answers
1k views

What bicycle design factors affect stopping power?

I've been under the impression that bikes and motorcycles cannot stop as quickly as cars. I'm curious what factors have the largest impact on bike stopping distance. What comes to my mind are: ...
5
votes
3answers
768 views

Has a bike been made with a rear derailleur above the chainstays?

The question title pretty much sums it up, but has a bike with an alternate drivetrain style like this been made? This would mean a derailleur mounted essentially upside down with the tension pushing ...
4
votes
6answers
402 views

Why do we need front brakes?

Most biking accident stories (ignoring collisions) that I hear about involve squeezing the frontbrake too hard and flipping over, often when biking on a downhill. Read, for example, this fellow's ...
4
votes
3answers
1k views

difference in aero bar design

I see that there are many types of aero bars, i.e., different designs. I am going to buy one but I am not sure which one is better. Here are two types of aero bar designs: Type1 Type2 The ...
4
votes
3answers
638 views

Are there any locking options that lock the drive train of a bicycle?

I've been looking into the different kind of locks available, and came upon this short documentary about bike thefts in London. Seems that just about any lock on the market can be easily beaten by a ...
4
votes
3answers
286 views

Down tube and seat stay

I've noticed that in a lot of bikes (though certainly not all), the seat stay and the down tube are parallel or nearly so. Is there any structural reason why a manufacturer might make that choice or ...
2
votes
4answers
304 views

Effects of design on speed?

I'd like to understand more about how the design of a bike affects its speed (assume a normal, two-wheeled bike with gears). Can I assume that weight has little effect, on level ground, except when ...
1
vote
2answers
446 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 ...
1
vote
2answers
110 views

What are the technical differences between a bike for off-road touring and a mountain bike?

There are a lot of adventure touring bikes, or bikes designed for bikepacking, off-road touring and the like. But what is the difference between one of these and a standard mountain bike. E.g. what ...
1
vote
1answer
307 views

Why are cycle components so heavily branded? [closed]

The average car has the manufacturer's logo on the front and back. Usually that's the extent of the branding. It is discreet and under-stated. Sometimes with the higher-end luxury cars you don't even ...
1
vote
2answers
830 views

FEM: How to Design weight-distribution in bike prototypes?

Inferio! No-one can understand this bloated question here, now more focussed. Suppose you are doing a new bike. How can you be certain that some critical point won't get too much force and the right ...
1
vote
1answer
477 views

Mechanical Engineering Designing/ Analyzing Stress in the beam members of a bicycle

This question is for those who are familiar with analytical engineering of bikes (not using Finite element analysis) Okay guys, I'm trying to do an optimization project on the frame of a bicycle to ...
0
votes
1answer
342 views

What are simplest rideable bikes over history?

I copy-catted the question from moz here because he did not ask it himself. I try to keep my bike design as simple as possible so I need to learn from mistakes in the past. What are the simplest ...
0
votes
2answers
58 views

Pedaling in Rear Wheel design

I had built a bike similar to this one before. I think many would have this idea, too. However, for some reason, not many of these designed are commercially marketed. ...
0
votes
1answer
132 views

Use Raspberry Pi (and C#) in a bicycles [closed]

Any full source code sample projects about Raspberry Pi (or another) using it in bicycles ? Maybe interesting for create a dashboard in bike for manage lighting ? Examples: live web bicycle (gps ...
0
votes
1answer
115 views

What could be the reason for stem this far away

I own a bicycle similar to this one: (I replaced the handlebars with straight one on mine) I know that there were some weird designs back in '90s, but some reason probably exists for creating a ...