Grand Prix 4 Season 700C x 28 Road Tyre.Size:700C / 28.Reliable companion for training rides and in competition, come rain or shine.The tire with a superior durability ready for any season Technical details:The benchmark in puncture protection:- Vectran™ is a synthetically manufactured high-tech fibre from a natural model.Like spider silk, Vectran™ is a liquid-crystalline polymer (LCP).Vectran™ is spun from the melted liquid polymer Vectra and processed further to a multi-strand thread.Spider silk like Vectran™ has an enormous tear resistance at a very low weight:Exactly the right properties to process into a premium Continental bicycle tire as a puncture protection insert.A Vectran™ Breaker is lighter, more flexible and protects more effectively against cuts than the comparable nylon breaker.Vectran™ Breaker does not adversely affect the rolling resistance.Specifications:- ETRTO:32.- 622.- Dimension:700 x 32C.- Technology:Double Vectran Breaker.