62

What really struck me though was that the average speeds really haven't changed much The chart ranges from about 25km/h to over 40km/h, and that is a big change. As others have mentioned, increasing your average speed requires a non-linear increase in power applied to the pedals. In other words, to increase average speed from 25km/h to 26km/h is easier ...


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 ...


12

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 ...


11

I'd say the biggest change is the shift from coil and oil shocks to air springs. Even at the cheaper end of the market most bikes designed to go uphill will be using air shock suspension. Air suspension is lighter but in the past has performed less well and been more expensive. Over the years price has fallen and performance has improved. The other big ...


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 ...


10

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

To me (and for others, I think) the greatest paradigm shift (that should become widespread in the near future, my opinion) is the inertial-controlled compression-lockout valve (Fox Terralogic, Specialized BRAIN). These work as automatic lockouts, which make the bike stable if the rider pushes it down (like pedalling hard on a smoot uphill, or sprinting on ...


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.


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

The NuVinciĀ® 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

Two things that must be considered when looking at the average speeds of the Tour de France are strategy and racing dynamics before you look at the numbers. The main strategy objective for any of the teams in the Tour is to go only as fast as you must to achieve a given objective while doing the least amount of work possible. If teams could win the tour ...


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

I think you could take this technique pretty far, but probably not all the way (at least usefully). I see a lot of use for the first part of your plan: taking multiple pictures and reconstructing a 3D model. If you try this for multiple postures I think it should be possible to determine an optimal position for you on your bike based on just looking at the ...


5

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 ...


4

They say that this year's Tiagra is generally last year's 105, which is true to an extent. You'll see things like 10 speed cassettes move down the product line at a rate of one series per year or so. It's not entirely true though. Features creep down, but quality stays about the same. The different series will maintain their relative build qualities year ...


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

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

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

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

As suggested by Anton, here's a look at the Milan-San Remo race that's been using the same (or almost the same) route over the years: ... to give you a better idea of your original question, look at a race like Milan San Remo. Using the same route over all the years. (Or very close to the same route...) There you will see the average speeds have increased ...


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

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

In the light of Lance Armstrong's revelations clearly the answer is that doping has played a significant part in race speeds over the last two decades when it was widespread throughout the sport. None of the data during they period can be relied on and indeed the tour has a long history of doping.So much for cyclings healthy reputation.


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

You could put a padlock through the crank for extra security, so when the crank is turned it would hit the derailer or get trapped in the chain. Extra security of any kind will reduce the likelyhood of theft!


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