Make:

There's some challenges as biking on ice or snow that just call for creative solutions. I was looking for some pictures of bikes with rear tracks and here's some funny bikes i've came across. It might inspire some makers!

The oldest one i've found is from 1885, the pedal system is simple but functionnal :
<a href="www.bicycleman.com/ history/history.htm">
<img src="http://www.bicycleman.com/history/images/icebike_lg.jpg" / >
</a>

There's another old one from 1894 , the rear paddle wheel is funny:
<a href="http://www.metzbicyclemuseum.com/Bike33a.html">
<img src="http://www.metzbicyclemuseum.com/sitebuilder/images/icebike-515x270.jpg" / >
</a>

This Human Powered Snowmobile is quite an achievement too:
<a href="http://paulworden.freeservers.com/Snowmobile_photo.html">
<img src="http://bf5man.googlepages.com/MR_snowmob8cmbw.jpg" / > </a>

Here's an ancestor of the snowmobile, that one is motor powered and is made on the basics of the 1885 one. A careful look at the rear seems to indicate that there was another seat for another person:
<a href="http://winfield.50megs.com/Sig_Haugdahl_cars.htm">
<img src="http://bf5man.googlepages.com/icebike.jpg" width="400"> </a>

This is a modern one with the rear track:
<a href="http://geocities.com/rcgilmore2000/WinterHPVs.htm">
<img src="http://geocities.com/rcgilmore2000/snowbike.jpg">
</a>

Another modern prototype, the Snomobike, it was supposed to arrive on the market this winter but it doesn't seem to have been produced.
<a href="http://www.snomobike.com/Prototype%20Gallery/index.html">
<img src="http://www.snomobike.com/IMAGES/photos/Bike_Stock_cleaned.jpg">
</a>

And the final one, is an hand powered ice bike that made his way on top of a glacier, it looks fun to ride! :
<a href="http://www.mobilityeng.com/">
<img src="http://www.mobilityeng.com/pod1.jpg">
</a>

Some more can be found <a href="http://www.geocities.com/rcgilmore2000/WinterHPVs.htm">here.</a>