As in Hazardous to the ego of Mother Earth. The stroboscopic effect of these tires is darn near hypnotizing. They lull the ground asleep, fast asleep. And you rip it up like a maniac. Featuring a "negative" knobby tread, the SweetskinZ trekking tire is perfect for city street or loose surface bike trail. The connected center ridge assures the rider of a smooth, fast ride. Not only do the deep grooves grip the turns and sketchy surfaces, they hold the SweetskinZ reflective material for the best nighttime visibility.

• all over reflective tire
• trekking style wired-on tire
• 700 x 37C