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Sigma BC 1009 Bicycle speedometer

Sigma fitness monitor in action with Lucy in backgroundThis Sigma fitness monitor was around 20 dollars and took less than 10 minutes to install.

It's a good way of keeping track of elapsed time, average speed and more.

I was thinking the other day it might also help to estimate power generated once I start experimenting with pedal power.



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Almost 43mph Wow!
Comment by Brian Sun Jan 13 09:18:24 2013

These devices basically only measures the time it takes to make the wheel to round. This is translated into speed by multiplying it with the circumference of the wheel which you have to program into the device. This is not sufficient to translate into power.

Real power meters are usually intergrated in the crankset. They basically use strain gauges to determine the force applied to the pedals. Using time and crank position this is then integrated into power. They are quite expensive (think thousands of dollars).

Of course on an exercise bike, your speed is always 0 mph. :-)

Comment by Roland_Smith Sun Jan 13 11:36:09 2013