15

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 bike, shown here. His arms are not as outstretched, and therefore it is not as aerodynamic. The superman position was first used in the hour record attempt by ...


15

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 surface that is toothed and a pawl (which is a lever that engages the toothed surface and only allows movement in one direction). In a bicycle this design is ...


12

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 the crank length is constant and they know what it is; that means that there is a one-to-one relationship between the kgf and torque columns. In this case, it ...


11

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 stronger freehub with relatively low resistance and causes all 6 double tooth pawls to engage simultaneously with high precision. Mechanism There are several ...


11

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 casing the cords on which you apply pressure are anchored to the bead wires over a distance of about twice the tire width and the whole section shares resistance to ...


8

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 transferring torque. A more complicated variation is what is used in Chris King hubs. Mechanism - DT Swiss 1. end piece 2. bearing 3. thread ring 4. axle 5. ...


7

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 the only company to bring it to bicycle hubs. Sprag clutches offer low rolling resistance and virtually instantaneous engagement. They are also reliable and ...


6

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, and we seem to do OK with discrete steps in the gear ratio.


6

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's Comp offers a wide variety of half-link BMX chains for both race and freestyle." Basically, you can break your chain at smaller increments to get a more ...


5

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 have been around since 2006. I recall seeing them at Interbike around that time. More info in the internal structure


5

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 like this as an alternative to using a powermeter or windtunnel testing. View it as a tool that can be used as an extension of sound methodical testing, to test ...


5

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 improvements don't happen each year but rather every 3-4 years. Aside from pro and sponsored riders most riders would not see any value in replacing a bike for ...


5

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-outs). A centimetre difference in wheelbase will change the feel of the bike quite a bit, especially on a short bike like a BMX. Half link chains can only be ...


4

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 improvements in the bike due to technology advances and research and development. Some of the base models will not be radically different from your frame, although even ...


4

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 pneumatic tire. Cross-ply tires with their more rigid sidewall would be less prone to snakebite punctures of tubes and would hold rims off the ground with less ...


3

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 days, so if you want to read sensors, you just need to know how to speak ANT+ or Bluetooth in your chosen language. You can also add a GPS module and other ...


3

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.


3

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 in that price range will be the frame. It is much easier now to get a frame that actually fits your riding style, I see you have an adjustable angle stem. ...


3

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 two different cars, the difference is minimal compared to what I had with the bicycle (in a 25Km ride the difference was only 10 meters compared to the cars). ...


3

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 analysis I saw was in the right ballpark but a little different -- different enough that I suspect it would have had difficulty with things like skinsuits and shoe ...


3

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 carbon frame this bend is apparently not a significant weakness. The same manufacturer also offers an aluminium version of the bike. Of course that's isn't ...


2

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 tires with full suspension, overcoming the handicap of small wheels to produce a fast but rather heavy bike. Since 1987, the Moulton AM7, with 17-inch wheels, ...


2

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 because every steering change alters the view. However the camera looks where your front wheel is pointing, compared to: Camera on the head tube - Excellent ...


2

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 will come from rule changes. UCI allows electronic gears. There is currently a minimum weight for road races and pro level bikes get under this limit so there ...


2

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 magnet less speed and cadence sensors. The altimeter seems to be very sensitive and enables more or less real time grade display – just in case you want to ...


2

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 pro racing or you are a really weight weenie or you just have money to burn, then you can go and change both pullies if you want to. From several studies, at ...


2

"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 thats very much a forebearer of external bearing cranks. And if you're not just talking road, you'd be able to find plenty of examples of MTB/DH and of course BMX ...


2

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” with a text editor). The XML schema includes fields for all kinds of things, including heart rate. It seems the FitBit Charge can export data in CSV format, ...


1

The best that I can find is a page on the Wayback Machine, that shows a prototype of the Dura Ace 7700 groupset (first to have the splined cranksets) being given to several teams and individuals for the 79th Giro d'Italia, as well as being used for several races later in the year (Including the Olympics with a win) (emphasis mine): 1996 Dura-Ace took ...


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