The Walden Effect: Farming, simple living, permaculture, and invention.

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.

Anna Hess's books
Want more in-depth information? Browse through our books.

Or explore more posts by date or by subject.

About us: Anna Hess and Mark Hamilton spent over a decade living self-sufficiently in the mountains of Virginia before moving north to start over from scratch in the foothills of Ohio. They've experimented with permaculture, no-till gardening, trailersteading, home-based microbusinesses and much more, writing about their adventures in both blogs and books.

Want to be notified when new comments are posted on this page? Click on the RSS button after you add a comment to subscribe to the comment feed, or simply check the box beside "email replies to me" while writing your comment.

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

profile counter myspace

Powered by Branchable Wiki Hosting.

Required disclosures:

As an Amazon Associate, I earn a few pennies every time you buy something using one of my affiliate links. Don't worry, though --- I only recommend products I thoroughly stand behind!

Also, this site has Google ads on it. Third party vendors, including Google, use cookies to serve ads based on a user's prior visits to a website. Google's use of advertising cookies enables it and its partners to serve ads to users based on their visit to various sites. You can opt out of personalized advertising by visiting this site.