Actually you need to Google what tire siping does you're confusing it and channels. Siping are razor thin cuts that create edges that grip. The narrow slits in the bottom of deck shoes are for the exact same thing.....grip against smooth wet surfaces. It's even named a siped sole.You've got alot to learn,the slit's or tread in a tire are to disperse water away from the contact patch and reduce the chance of hydro planning NOT added grip.Deck shoes are made with rubber non marking soles so as not to mess up the decks and rubber gives better grip and again the slit's or tread is to disperse the water. Friction drive rollers rely on the friction/tension against the tire for the cut's to grab and this method is older than you, don't you think that if there was a better way/design it would be in use.
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