15 votes

How efficient is string bike? Is this really a revolutionary bike?

The general idea of "lever drive," or a reciprocating pedal motion instead of a rotary pedal motion precedes even the invention of the modern diamond-frame bicycle--consider the Special Star from 1886....
Adam Rice's user avatar
  • 30k
13 votes
Accepted

How efficient is string bike? Is this really a revolutionary bike?

I bought one of these on ebay a few months ago. I bought it there because the manufacturer was unresponsive to queries and I was able to get one for <$1000 which is much more affordable than the ...
Peter Young's user avatar
10 votes

Why is my new front wheel not spinning?

The most likely problem is that the brakes are rubbing. If you pick up the front of the bike, hold your head near the brakes and spin the wheel you shouldn't hear any noise from the brakes. If you ...
DavidW's user avatar
  • 5,188
10 votes

Planning to purchase a road bike

You basically get what you pay for, so there isn't any secret formula. Trek is one of the largest manufacturers on the planet, and is probably as good as any other on the market. But have a look at, ...
PeteH's user avatar
  • 9,733
10 votes

What are (a) the source of and (b) the justification (e.g. experimental) for the concept of "normalized power" used in physical endurance training?

My understanding is that high-intensity efforts are disproportionately taxing, and NP is a way of reflecting that. That is, if you went for one ride where you maintained a steady 75% FTP output, and ...
Adam Rice's user avatar
  • 30k
9 votes
Accepted

How does the frame geometry of a cyclocross bike affect its performance in off-road conditions?

I usually don't like to generalise about categories, but in the case of cyclocross, there's a good reason to do it: it's an UCI race discipline, and so there are strict rules about how the bikes ...
Rеnаud's user avatar
  • 20k
8 votes
Accepted

Just how much difference does your bike make?

Bicycles, like many machines, are efficient, but a large amount of energy converted by them is not in fact used for their "intended" purpose: The largest energy sink is air/wind resistance, which you ...
errantlinguist's user avatar
8 votes

losing weight versus getting lighter bike

If you want to get faster, train better. On flat terrain, weight is virtually irrelevant for your speed. It is only relevant when you accelerate or brake, but not while you are riding at speed. So ...
cmaster - reinstate monica's user avatar
8 votes

What are (a) the source of and (b) the justification (e.g. experimental) for the concept of "normalized power" used in physical endurance training?

Focusing more on the empirical part of the question, consider the link that R. Chung gave in his first comment to Adam Rice's answer. That's the introductory chapter to Andrew Coggan's book, training ...
Weiwen Ng's user avatar
  • 31.4k
7 votes
Accepted

Does cannabis affect cycling performance?

Are you asking about the immediate effects while high or long-term effects? I can't find any unbiased, well-cited sources except for one from the British Journal of Sports Medicine which basically ...
errantlinguist's user avatar
7 votes

Disadvantages of using QR->Thru Axle Adapters?

This is a deceptively complex question because it touches on many aspects of hub design, and answering it properly would also require taking some kind of survey of what design choices have wound up ...
Nathan Knutson's user avatar
7 votes
Accepted

Can a lightweight cyclist climb better than the heavier one by producing less power?

Yes. This article goes into detail and shows the formula along with a few scenarios. In short, power-to-weight ratio becomes more important than raw power as the grade increases. Aerodynamic drag is ...
Adam Rice's user avatar
  • 30k
6 votes

Best specifications to look for a mixed use bike

Nothing - anything that makes a suitable single track bike is compromised for road riding. However, a 10 mile commute on a MTB with knobblies is not out the question altogether. What's 'best' will ...
mattnz's user avatar
  • 50.5k
5 votes

How do you bicycle the most efficiently on a road bicycle?

General Rule of Thumb: Go harder on "slow" parts (especially uphills), go easier on "fast" parts. This rule of thumb has two separate justifications: (1) Uphills or on slow surfaces (rough ...
kevins's user avatar
  • 1,412
5 votes

How do you bicycle the most efficiently on a road bicycle?

The first answer is: you bike most efficiently inside a peloton (where air resistance is lowest) The second answer (in a GCN video of a sprinter): you do a lot or close to no effort in order to stay ...
Calin Ceteras's user avatar
5 votes
Accepted

Running tires with significantly different pressures?

The markings on the tires for the pressures can be essentially ignored. They're a combination of marketing and legal departments coming up with essentially arbitrary numbers. Find a set of pressures ...
Batman's user avatar
  • 46.2k
5 votes

Why do cyclists shave their legs?

In addition to the previously mentioned benefits, recent wind tunnel testing performed by Specialized has shown that shaved legs will save about 50 to 82 seconds over a 40km TT...certainly not an ...
Ealhmund's user avatar
  • 2,065
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 ...
Morten's user avatar
  • 483
5 votes

losing weight versus getting lighter bike

The exact wording of relevant bits of the question is: losing weight or getting the same weight less in a lighter bike ... assuming that the new bike purely weighs less and not better mechanical ...
Weiwen Ng's user avatar
  • 31.4k
5 votes
Accepted

What are (a) the source of and (b) the justification (e.g. experimental) for the concept of "normalized power" used in physical endurance training?

I was very curious about where the 4th power came from. I thought it might be from some fundamental physics and/or physiology, but it doesn't. It's just the result of a curve fitting/regression ...
Byron Dom's user avatar
  • 151
4 votes

Explaining the effects of frame geometries

I think the question deserves some additional treatment as to frame sizing. I realize the OP may have downplayed aspects of frame sizing in his question, but that's arguably the wrong approach. It ...
Weiwen Ng's user avatar
  • 31.4k
4 votes

Commuter bike for better performance: less weight, or internal gear-hub?

I have only three things to add: I would definitely get a bike with hub dynamo and fixed light. Even if you ride during daytime, having the lights on gives you added visibility in traffic and the ...
NoirDesir's user avatar
  • 198
4 votes
Accepted

Commuter bike for better performance: less weight, or internal gear-hub?

When you use your bike every day, reliability is as important as weight. I use 2 bikes, with a train ride in between. The bike I use at my work town rarely gets maintained. I take it home 2 times ...
Maarten Fabré's user avatar
4 votes

losing weight versus getting lighter bike

As asked, only dealing with weight change, not considering other factors that make a bike rider faster. For highly trained cyclists, losing weight means losing muscle mass, presumably from muscles ...
mattnz's user avatar
  • 50.5k
4 votes

losing weight versus getting lighter bike

When some years ago I decided to start doing multi-weeks cycling vacation, I asked myself how to make sure I could manage riding about 100 km a day, several days in a row. Since I already had a light ...
L.Dutch's user avatar
  • 7,121
3 votes
Accepted

Curious about foot position on clipless and regular pedals when mountain biking

Clip-less (and before them, clips) came out of the road riding community where the emphasis is on power transfer and efficiency. The most efficient position is the ball of the foot on the spindle (+/-...
mattnz's user avatar
  • 50.5k
3 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 ...
Yaroslav's user avatar
  • 143
3 votes

Switching to touring bicycle: Performance considerations

There are a lot of factors that go into your speed and efficiency, and this switch touches several of them: Rider Position: Typically, a bike with touring geometry will have a slightly longer ...
Gary.Ray's user avatar
  • 16.4k
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 ...
R. Chung's user avatar
  • 14.1k
3 votes

What are the 'easiest' ways to determine functional threshold power?

The rider in question bought a Powertap hub. The option of doing the ramp test on a smart trainer was probably not common then. Today, I would suggest that newer riders should consider this, with some ...
Weiwen Ng's user avatar
  • 31.4k

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