This is the first time I've heard of it. Looks like it's only useful in water.
Can't imagine someone using them while riding off road because those trails are narrow and that extra 16 inches could prevent you from accessing certain areas your ATV normally could.
They are similar to snow shoes in that they increase the surface area you are riding on to allow you to "float". So snow, mud or even sand would be types of terrain that they would work well on im guessing. Tracks would also provide a similar benefit i would think.
Also the first time I'm seeing this and it's great for those times you're out on the trail and find it hard to tell the depth of mud and such, sure beats the mess you have to deal with during and after
Someone tested them in Texas mud and he kept getting stuck while his wife's ATV (running on traditional hardcore mud tires) was a beast through the mud. Granted the review was from a few years ago but the design hasn't changed.
Take a look if you want. http://www.jacobsatvmagazine.com/tmp/J_Wheelz/j_wheelz.html
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