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Questions tagged [technology]

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2
votes
0answers
39 views

What's the type of polymer material used in friction bushings in Sram rear derailleurs clutches?

The friction bushing of an (older) Sram rear derailleur clutch is shown below. What type of polymer material are these made out of? I'm also interested to know what friction materials are used in the ...
4
votes
2answers
188 views

How can I combine Garmin recorded track data with FitBit heart rate data?

I have a Garmin Oregon 600 and FitBit Charge HR. Is there a way I can combine the GPS track from the Garmin with the heart rate data from the FitBit so that I can use it in a visualization tool like ...
1
vote
1answer
2k views

Do half link chains work on any bike and what is their purpose?

Do half link chains work on any bike? What is the purpose of a half link chain? I've noticed that only BMXers and DJers use them, and that leads me to believe there is a technical reason behind ...
1
vote
0answers
108 views

Gear change recording

Has anyone heard of a device that records gear changes? Like a cadence sensor or power meter, but specific to recording when you change gear. With all the data we can currently capture about our ...
13
votes
3answers
1k views

Why are almost all bicycle tyres cross-ply/bias ply and not radial construction?

Most times when I see a failed bicycle tyre (one where the threads are showing through) they look something like this, with diagonal threads clearly visible Here's a random manufacturer's cutaway ...
15
votes
4answers
8k 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,...
6
votes
2answers
556 views

When did Square Taper Bottom Brackets retire from racing?

I haven't been able to find any hard data on this. I have the impression that most top-end bikes made the switch around the year 2000. It would be great if I could get an answer for both of these: ...
6
votes
1answer
4k views

Effects of jockey wheel sizes & types

I'm wondering about the variations in jockey wheels / derailleur pulleys and what differences they make; There's a lot of conflicting and confusing information out there, so I'm after some general ...
2
votes
2answers
413 views

Are there any bluetooth speed sensor with data logging ability?

I use my bike mostly for getting around town. First I used smartphone gps apps to record my trips, but I often forgot to start or stop recording. Then I used a bicycle computer, but I didn't like it ...
0
votes
1answer
4k views

Is it worth buying a RFLKT+ or is the RFLKT good enough?

Looking at Amazon, the Wahoo RFLKT is half the price of the Wahoo RFLKT+. What practical benefits would I actually miss out on if I just went with the Wahoo RFLKT? Any pros and cons of the two ...
6
votes
1answer
1k views

Why exactly did Boardman manage a further distance than Wiggins?

In light of Bradley Wiggins' recent hour record of 54.526km, I heard a lot about how Chris Boardman has the absolute record of 56.375km. What I didn't hear and (hence my question) what I want to know ...
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 ...
1
vote
3answers
6k views

Problems with Edge 510 Cadence/Speed Sensor

I have been looking online for a while on how to fix a bug with my Garmin Edge 510 Cadence/Speed sensor but no luck, and now I'm indoors training it's more important that it works (so I can get "speed"...
7
votes
2answers
424 views

Have there been designs of bikes with stepless transmission?

Today we studied about mechanical stepless drives, which appear to be used quite widely in industry machines, such as CNC lathes. The concept of varying the transmission ratio arbitrary, without ...
2
votes
3answers
503 views

Annual technology gap of high end road bikes [closed]

Somewhat general question. Could someone give me an idea of how much of a 'technology gap' there is between annual models of high-end road bikes (~$2000)? Specifically: Which components generally see ...
7
votes
3answers
3k views

Analysis of Stages high-speed data

A while ago Stages added a new feature to their power meter: High Speed Data recording added to capture pedaling force (kgf) and torque (Nm) 64 times per second for post ride analysis (.csv format)....
9
votes
2answers
2k views

Benefits of newer racer bikes over older ones?

10 Years ago, when I was 14, I got my first road bike. It costed around 1000 € (~1350$), and I have been using it every year. I have cycled at least 1.000 km every season. Now, I have started to ask ...
2
votes
2answers
117 views

Software to track and plan group rides

Is there software / online resources / Drupal distribution capable of letting riders self-track and perhaps rank various routes around a location? The end goal is to let new riders pair up with more ...
2
votes
3answers
2k views

Bike Speedometer Accuracy [duplicate]

What factors should one look for when purchasing a speedometer? Does wired vs wireless or anything else factor into its accuracy?
7
votes
3answers
987 views

DIY computational fluid dynamics for aerodynamics?

Has anyone experimented with using consumer 3D software to do CFD-like aerodynamics simulations? Specifically, I was thinking: Setup the bike on a trainer (with rider) Take a series photos, and plug ...
3
votes
2answers
509 views

How fast does new technology “trickle down” to lower models?

Is there a "rule of thumb" for how fast new technology "trickles down" from higher-end to lower-end bike models? Can you for example say that a mid-end bicycle frame or suspension fork is as good as ...
8
votes
2answers
2k views

What are the main improvements in suspension technology in the last 10 years?

How much has bicycle suspension technology evolved in the last 10 years? I am thinking about both rear and front suspension. What have been the major breakthroughs that all bicycle manufacturers are ...
5
votes
3answers
3k views

What does a cyclocomputer actually measure for calculating the speed of the bike?

What does a cyclocomputer actually measure for calculating the speed of the bike? Is it the time for one revolution $T$ or is it the number of revolutions $n$ per given time $t_0$? If the radius of ...
66
votes
27answers
55k views

Why aren't Tour de France riders going any faster?

I was having a look at the average speeds of the winner of the Tour de France over the years on this page. To help things along I put the data into LibreOffice and produced a plot: I put on the chart ...
8
votes
4answers
5k views

Tapered Head Tube

I am wanting to understand how a tapered head tube works. Does it require a tapered steerer, or is it the case that the steerer is a consistent diameter top and bottom and just the bearings differ in ...
10
votes
5answers
16k views

Are road-bike suspension forks still manufactured, if so, where?

For a few years, road bike suspension forks were used at Paris-Roubaix, but now they seem to have disappeared. Are they still being manufactured? If not, why (aside from UCI regulation) did they not ...
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 ...
32
votes
9answers
23k views

What headset/radio products exist for bike-to-bike communication?

I commute to work by bike, sometimes I share the journey with a co-worker. The problem is because of the wind and distance between the bikes, it's very hard to hear what the other person says. It ...
8
votes
9answers
1k views

Bicycle innovations in the pipeline?

The (road) bike I bought 25 years ago is very similar to my current bike. (The derailleur on my new bike adjusts exactly the same way). The materials of my current bike are vastly different than the ...
29
votes
7answers
936 views

What is a good camera arrangement for city riding?

I would like to have continuous camera coverage while commuting on city streets, in order to have evidence in any collision. I have been experimenting with an ATC3K mounted on the pannier rack, ...