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2
votes
1answer
102 views

why does the lemond revolution turbo trainer quote its volume of air resistance in meter^2 and not per second cubed?

The Lemond revolution states that it creates consistent aero resistance with its fan power from 0 newtons to 40 newtons along one axis and 0 to 160 meters/second^2 on the other axis. Since air flow is ...
-4
votes
3answers
541 views

If I attached a “pointy” pool noodle to my bike, would it make me safer even from sadistic drivers?

A few sources suggest that mounting a foam pool noodle on the back of your bike can help stop drivers from passing too closely. Such noodles are available at my dollar store, unlike spring-loaded bike ...
1
vote
1answer
515 views

Is a bike faster than a car for the first ten metres? [closed]

The city I live in has just installed cycle boxes in front of traffic at light controlled intersections. This has spark a lot of debate online. My experience is that I will generally, through timing ...
6
votes
2answers
716 views

Approximately where is the center of mass of a mountain bike?

Take a "standard" multipurpose bike like this one: http://www.islabikes.co.uk/bike_pages/beinn29.html (Weighing 12.2kg) I'm conducting a physics investigation, and for this I need to know the ...
7
votes
6answers
3k views

Is it possible to estimate road grade while riding?

It would be nice to be able to estimate the grade of a road while riding, even if the estimate is not completely accurate. With a GPS, in theory it should be possible in theory to ride a short ...
7
votes
6answers
5k views

Does a 700c wheel help you go faster?

Someone suggested going with a 700c wheel to go faster, and after thinking about it I am wondering if a larger wheel actually does go faster. I understand that your gears will cause a wheel to rotate ...
5
votes
3answers
1k 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 ...
8
votes
3answers
2k views

How does a bike absorb all the energy in landing from a big drop?

There are countless videos showing BMX/freeride/downhill etc. riders jumping and dropping from heights. For the unprofessional spectator, they seem impossible to survive. From the physical point of ...
4
votes
4answers
9k views

How do I calculate the power required to climb a hill at a given cadence?

Suppose I ride at a cadence of 50RPM for 10 minutes with a 39x23 gear ratio on a hill with 10% grade. Is there a simple formula to calculate the power output required?
9
votes
1answer
751 views

What is the effect of adding weight to a wheel vs adding it to the frame?

There are claims often made that, eg, "An ounce of weight at the rims is like adding 7 ounces of frame weight." This is "common knowledge", but a few of us are skeptical, and our crude attempts at ...
6
votes
3answers
1k views

What bicycle design factors affect stopping power?

I've been under the impression that bikes and motorcycles cannot stop as quickly as cars. I'm curious what factors have the largest impact on bike stopping distance. What comes to my mind are: ...
15
votes
9answers
7k views

What makes a bike stay upright when moving?

What makes a bike stay upright when it is in motion? What is the relationship between speed and stability? Is it a linear relationship? I could ask this on the physics site however I am hoping ...