Price per Km.

NeilMcEoigheann

I saw this on the images of beauty thread but i felt it needed a thread of its own,
my fixie runs 5c per km at the moment, but i've only had it since september
i'm working on the fact that your kms are very expensive at the start but eventually your bike runs free,
so what are your prices.

NeilMcEoigheann

price / km = ppkm

TinyExplosions

My bike was free, so I've a negative ppk already:)

(well, it was paid for by an insurance company, but not by me!)

DirkVoodoo

Are you also working in any extra food consumption?

NeilMcEoigheann

there offset by the lack of trips to the obesity clinic...

DirkVoodoo

Just reading there that the estimated total energy consumption of the commuter riding at 20 km/hr is 443 KJ/Km.

I reckon my felt has been fairly expensive so far, I haven't cycled as much as I should recently (clear evidence of that on saturday )

Capt'n Midnight

3600 KJ is about 1Lb in weight , if you burn 3600KJ you should be 1 lb lighter.
7920 KJ per Kg

http://en.wikipedia.org/wiki/Bicycle_performance
Generally used figures are
* 1.62 kJ/(km∙kg) or 0.28 kcal/(mile∙lb) for cycling,
* 3.78 kJ/(km∙kg) or 0.653 kcal/(mile∙lb) for walking/running,

slightly OT but walking a certain distance uses the same amount regardless how fast you go. You simply burn the calories at a faster rate if you walk faster.

all exercise benefits for a while later due to higher metabolic rate for perhaps a few hours.

Tesco do value pack noodles at 13c or something a pack ( is this the cheapest fuel ) , the point being if you are burning more calories may be you can eat lower quality food since you don't need your RDA of essential stuff to be so concentreated.

DirkVoodoo

Found this here.

Interesting part about relationship between rider speed and energy consumption:

These relationships can be written as follows, where y represents the rate of energy consumption in Kcal / min for a 150 pound rider, x represents the average speed travelled in miles per hour, and exp(a) means e to the power of a:

* Mountain bicycling: y = 1.47 * exp(0.144 * x)
* Touring: y = 1.41 * exp(0.125 * x)
* Racing: y = 1.34 * exp(0.107 * x)

As is evident from these relationships, speed is important, but if a rider is trying to increase the number of calories consumed in a ride, it is far better to increase the distance travelled (and therefore the amount of time riding) than to increase the speed travelled. For example, a 20 mile ride with an average speed of 19 mph on a touring bicycle works out like this: rate of energy consumption = 1.41 * exp(0.125 * 19) = 15.2 Kcal / min. A 20 mile ride at 19 mph takes 63 minutes, so the total energy consumed over the course of the ride equals 63 * 15.2 = 958 calories. If the rider increases his or her speed to 20 mph, the total energy consumed is 1032 calories. This is equivalent to riding 21.5 miles at 19 mph, or riding for 68 minutes at 19 mph. In other words, the same amount of energy is consumed by riding for 8 additional minutes at 19 mph, versus 20 mph.