Keep the rubber side down and fully inflated when you choose MICHELIN's Protek tires. A specially-cut tread pattern reduces rolling resistance, and MICHELIN's rubber compound makes for an excellent grip. Grooves at the shoulders help increase traction on wet and greasy surfaces. A 1mm-thick anti-puncture reinforcement will help ensure nothing bursts your bubble, so you can enjoy the ride. Weights: 27 x 1.25 (650g) 700 x 28c (575g) 700 x 32c (630g) 700 x 35c (700g) 700 x 38c (760g) 700 x 40c (800g)