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12
votes
5answers
789 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 ...
7
votes
3answers
6k 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
453 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
774 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: ...
3
votes
2answers
315 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 ...
2
votes
4answers
251 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
1answer
283 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
1answer
334 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
264 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
532 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 ...