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Questions tagged [design]

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3
votes
4answers
280 views

Is there any reason for the rear frame and bottom bracket to be asymmetric?

I just received a new non-brand carbon frame and immediately noticed that the bottom bracket looks to stick out significantly more to one side than the other, and the rear bottom forks also seem to be ...
33
votes
5answers
7k views

Why are most bicycle gears designed to have so much overlap

For bikes with a front derailleur, I've noticed that the gearing ratios of most bicycles are not linear, and there is an odd "overlap" between those power ratios as you switch from one front gear to ...
3
votes
2answers
506 views

How do I calculate the spring weight rating for my bike?

I have a home built bike design and the rear shock absorber that came with the part bottoms out so I want to get one that is more appropriate. But I have no idea how to calculate which one to buy as ...
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., ...
4
votes
2answers
389 views

Are most bikes' paint jobs not as durable as they used to be?

I am asking specifics in a few posts so as to not get into discussions. Consider this a continuation of bike quality for the price. I find the paint job on my bike to be nice but very thin and fragile....
-3
votes
1answer
155 views

Is a bicycle wheel an indeterminate structure? [closed]

Does anyone knows whether a bicycle wheel is a statically determinate or indeterminate structure?
5
votes
3answers
283 views

Do mid-low end bike manufacturers only design their bikes to last 1000 miles?

When exploring a braking system, I noticed with surprise that they tested their brake actuations to match the 1000 mile quality life expectation of a comfort bike. This seems to imply that this is the ...
-3
votes
1answer
160 views

Why is the single-rear derailleur that enables <= 12 speeds so popular?

All the high-end MTB, and road racers seem to have somewhere between ... 6 and 12 gears. NO derailleur up-front, only a few to scroll through in back. I get the KISS principle behind it; I like having ...
-2
votes
1answer
196 views

Rickshaw physics

I wanted to know the physics behind the working of such a model. Specifically, the relationship between the force applied by the Rider and the weight of the passengers.
15
votes
4answers
6k views

What freewheel mechanism designs are used in bicycles?

What are the various freehub mechanism designs that have been designed and or put into production? (doesn't need to have been made necessarily!) A good post will contain: A description of the design,...
3
votes
1answer
1k views

Feasibiliy of KERS for bicycles

I want to know more about KERS for bicycles... I have a question. What will happen if we attach the flywheel on front wheel? Does it make any difference? Please reply me.. I preparing this as my ...
21
votes
3answers
6k views

What is an asymmetric wheel and why would you use it?

Campagnolo advertises the Khamsin Asymmetric Wheel: What is an asymmetric wheel and (given that we expect wheels to be symmetrical), why would one want an asymmetrical one? How is it related to dish?
10
votes
1answer
207 views

Why not have the bearings in the forks themselves with through-axles?

Given that we're moving away from QRs to through-axles - partly driven by the torque needs of disc brakes, why not follow the natural progression and move the wheel bearings from the hub to the forks ...
5
votes
2answers
280 views

Derailleur Configuration - Anyone ever seen something like this?

Can't find anything on Google because I guess I don't know what search terms to use. I am wondering if anyone has ever seen a derailleur setup like I have drawn in the picture. It is NOT for ...
14
votes
1answer
38k views

What is the difference between I.S., post, and flat mount disc brake mounting standards?

What is the difference between "I.S." (international standard), "P.M." (post mount), and flat mount disc brake mounting standards? Does one have a clear advantage over the other and is there a ...
-2
votes
4answers
963 views

Does anyone manufacture a seatless bicycle?

I need to stay fit and cycling is a great non-impact exercise. I don't see the point in sitting when cycling, instead I rather standing as such as it creates a better form of exercise. Are there any ...
0
votes
1answer
50 views

Handling Stability Parameters [closed]

I'm building my first bike: probably steel (easy to work with). 2X26" road tires. Full suspension. Will be used on sandy dirt roads, and paved streets with moderate incline. Want hands free option, ...
5
votes
1answer
576 views

Dynamic stability of a tricycle

I'm currently designing the "electric bike of my dream" (please do not laugh! it's for fun, nothing serious), and I came up after some though with a tricycle, where 2 rear wheels are supporting the ...
13
votes
1answer
248 views

Why do track bikes vary between events?

Watching the Olympics, I've noticed that track bikes seem to vary between events. For example, in the Keirin, all the riders have bikes with a solid/disc rear wheel and a front wheel that has a solid ...
1
vote
1answer
391 views

2 wheeled trailer - wheel position/weight distribution

Two wheeled trailers usually have the wheels in the middle as far as I know. I understand this minimizes additional weight on the back wheel of the towing bike. But wouldn't moving the wheels back on ...
-4
votes
1answer
215 views

Is it useful to design a pedal with kickstand? [closed]

i am working on a project, trying to combine a pedal and kickstand. It can provide temporary balance for the bike, and to take better bike photo easily. Do you think you ever need such a product? ...
1
vote
0answers
72 views

Why do most mtb forks place the arch in front of the stanchions? [duplicate]

Similarly to the pictured below RS Pike, most fork manufacturers place the ark in front of the stanchions. This has proven to be a terrible solution when riding in muddy (or actually anything ...
10
votes
6answers
2k views

Are folding handlebars a good idea from an engineering standpoint?

A couple of Chinese stores have been selling folding handlebars: At first glance this appears to be a great idea since the handlebar width is one of the reasons that carrying and storing bikes can be ...
-3
votes
2answers
2k views

how to design a shaft and gears for shaft driven bicycle [closed]

i want to know about the complete design and dimensions of the shaft and suggest me to give more efficiency to the bicycle
5
votes
1answer
2k views

What are the advantages of handlebars with an integrated stem?

I was doing a bit of research for an upcoming handlebar purchase, and came across this strange piece of hardware -- handlebars with an integrated stem (or possibly a stem with integrated bars). So ...
1
vote
3answers
285 views

Safe to shorten a dual-pivot caliper mounting nut?

I have a 2006 Specialized Langster. Unfortunately the brake bridge is not deep enough to insert the shortest caliper mounting nut I could find (10mm). The head of the nut should insert all of the way ...
3
votes
2answers
480 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 ...
2
votes
3answers
171 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
3k 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 ...
7
votes
6answers
8k 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 ...
0
votes
1answer
138 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 bike ...
8
votes
3answers
2k 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
3answers
953 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 ...
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 ...
4
votes
3answers
7k 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 first ...
10
votes
5answers
5k 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 ...
7
votes
3answers
2k 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: Tire ...
3
votes
1answer
563 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 ...
5
votes
3answers
2k 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 ...
23
votes
10answers
43k 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 ...
4
votes
4answers
400 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 ...
15
votes
5answers
3k 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 ...
2
votes
1answer
913 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 ...
1
vote
2answers
1k 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 ...
0
votes
1answer
634 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 ...