16 votes

What freewheel mechanism designs are used in bicycles?

Standard Pawl and Ratchet Design This design is by far the most common on bicycle freehubs, and as such the least expensive to employ. Mechanism In it's simplest form, this design consists of a ...
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  • 1,901
15 votes
Accepted

Why exactly did Boardman manage a further distance than Wiggins?

Boardman used what is known as the "Superman" position, as shown in this image. This position has been deemed to be against the rules by the UCI. Compare it to the position that Wiggins had on the ...
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  • 21.4k
12 votes

Analysis of Stages high-speed data

The raw pedal force or torque data are difficult to work with but you can extract some information from them. First, note that Stages mounts the strain gages (or gauges) permanently to the crank, so ...
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  • 13.6k
11 votes

What freewheel mechanism designs are used in bicycles?

American Classic Cam Plate Design The full name is "Six Pawl Cam Actuated Engagement System." This design is one of the more complicated ones, but according to American Classic provides a ...
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  • 1,901
11 votes

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

Radial bicycle tires are very rare. The reason is that the lateral stiffness is much lower than for cross-ply tires. Imagine that you press the sidewall of a tire by your thumb. With a cross-ply ...
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9 votes

What freewheel mechanism designs are used in bicycles?

Star Ratchet and variations This design in it's simplest form is used by DT Swiss. This design incorporates easily replaceable ratchet plates that offer the added benefit of every engagement point ...
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  • 1,901
7 votes

What freewheel mechanism designs are used in bicycles?

Sprag Clutch The sprag clutch has existed in industrial applications for some time: being used in motorcycles, helicopters, airplanes, automotive transmissions, and others. As far as I know, Onyx is ...
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  • 1,901
6 votes
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Have there been designs of bikes with stepless transmission?

There have been designs, but cyclists tend to be picky about increases in weight or losses in efficiency. Bicycles do not have the problems of large spinning masses or rough clutching at low speed, ...
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  • 486
6 votes
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Do half link chains work on any bike and what is their purpose?

From the internet: "Half Link BMX chains were designed to help dial in the chain length on frames with short dropouts and small gearing, making sure your rear wheel is exactly where you want it. Dan'...
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  • 1,371
6 votes

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

As mentioned in another answer, the main purpose of half link chains is to have more control over the chain length and hence the wheelbase of your bike (assuming you have rear facing or slideable drop-...
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5 votes

Have there been designs of bikes with stepless transmission?

The NuVinci® N360 is a continuous variable transmission that is roller based. It is marketed and used mainly on hybrid and low maintenance city bikes. They must have had some market success as they ...
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  • 29.8k
5 votes

DIY computational fluid dynamics for aerodynamics?

Has anyone experimented with using consumer 3D software to do CFD-like aerodynamics simulations? - Yes Could there be any worthwhile insights gained from this? Yes However, you should not view work ...
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  • 443
5 votes

Annual technology gap of high end road bikes

While not disagreeing with the first answer above I think there are a few more complexities that haven't been addressed. Changes in bike technology are not linear but rather generational. Component ...
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  • 8,777
4 votes
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Benefits of newer racer bikes over older ones?

TL; DR: There is going to be a lot of difference. A 1500 Euro bike today would probably be comparable to a 6-7000 Euro bike from 10 years ago. Elaboration: There are going to be quite a few ...
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  • 3,227
4 votes
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Why are almost all bicycle tyres cross-ply/bias ply and not radial construction?

As far as I can tell, the biggest factor influencing bicycle tires has to do with the 4th bullet point you mentioned, sidewall stiffness, combined with using inner tubes instead of just being a ...
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  • 2,795
3 votes

Use Raspberry Pi (and C#) in a bicycles

Lighting control isn't exactly a good idea since you have 2 lights (front and rear) on a bicycle typically. Most cycling sensors (cadence, speed, heartrate, etc.) either speak ANT+ or Bluetooth these ...
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  • 45.5k
3 votes

Analysis of Stages high-speed data

Negative force/torque power !+ actively resisting the pedal. Thus, no conclusions about pedaling "style" (even for the left leg, which is all that Stages measures) can be drawn from data such as these....
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3 votes

Benefits of newer racer bikes over older ones?

Your current bike has decent wheels and reasonable components. If they have been maintained well I don't think you'll see much difference there other than 10spd gearing. The big change to a new bike ...
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3 votes

DIY computational fluid dynamics for aerodynamics?

The Stac Zero Virtual Wind Tunnel has been developed and released since this question was originally asked. I saw an analysis on someone who has tested in both wind tunnels and on velodromes. The ...
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  • 13.6k
3 votes

What is a good camera arrangement for city riding?

I have been down this route several times. Camera on the handlebars - works well, the view is low though and its a but less likely to see over things that the rider can see over. Tts a little wobbly ...
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  • 99.3k
3 votes

Bike Speedometer Accuracy

Most speedometers are accurate as long as you input/set the right wheel size! I have used very cheap ones, and they allow me to set the wheel size in milimeters, and after checking the same path with ...
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  • 1,427
3 votes
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"bent" by design frame

A cyclo-cross bike that had been quite successful in world cup and UCI championship races has a similar feature, IE a top tube bent up. Cyclo-cross is very stressful for the materiel. In this specific ...
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  • 8,962
2 votes

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

Alex Moulton (http://www.moultonbicycles.co.uk) has made full-suspension steel frame road bikes continuously since the 1960s. These are not slow low-end folding bikes: the Moulton marries 120psi ...
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2 votes

Annual technology gap of high end road bikes

Pretty broad but it has not been shut down Components High end road bikes are marketed to racers. UCI and other racing organizations have rules on what can and cannot be on a bike. Biggest changes ...
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  • 15.4k
2 votes

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

I have a RFLKT+ which I use with Cyclemeter. The significant differences are the altimeter and the ANT+ bridge. The reason why I bought it was so that I could use ANT+ sensors, specifically the Garmin ...
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  • 6,886
2 votes

Effects of jockey wheel sizes & types

Main gain is less friction when using ceramic ones and less friction on the transmission when using up to 15T pullies. This translates into couple of watts after a big number of km's. If you are into ...
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  • 133
2 votes

When did Square Taper Bottom Brackets retire from racing?

"First alternative" is a little tricky because if you looked hard enough you could potentially find a pro riding Sweet Wings cranks in the early 90s, which use a spindle and bottom bracket design ...
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2 votes

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

The GPX files produced by GPS devices are just XML so can fairly easily be edited by computer programs (and simple edits like removing sections where your GPS glitched out can even be done “by hand” ...
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2 votes
Accepted

A bike-share system's website told me: "The subscriber is valid but the account is disabled." Why? (It turns out that my credit card had expired.)

It turns out that I saw the message because my old credit card had expired, and I had not entered the replacement credit card's details into the website. When your credit card expires, your account is ...
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