I think they can sipe any tire?

http://www.discounttire.com/dtcs/tireSiping.dos

I know there was a spot that not only would sipe your tires, but would insert walnut shells into the siping, and they acted just like studs in the snow, but didn't tear up the road or cause you to skid on dry pavement, which studs can.

Fish on...

Todd
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Team Flying Super Ditch Pickle