Answer this.....

First some background. For times of bad weather they make a device you
can put your bicycle on to "train" indoors called "Rollers" They
consist of three rollers about 18 to 24 inches long, 2 are close
together and the back wheel rests between them the third is positioned
under the front wheel. See photo here....
http://www.nashbar.com/nashbar_photos/medium/TX-SPT.gif

In this situation the bicycle is obviously not moving forward. How does
it stay upright?


--
Chris W
KE5GIX

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