Protective belt with 3 mm thick in natural carpery extremely elastic and obtained for a third from recycled latex products. These tires are optimized to bear higher stresses and speeds than conventional tires. Recommended for electric bikes that reach 50 km/h. Specs:- HS485, Performance Line, Twinskin, GreenGuard, Addix and, E-Bike Ready 50- size: 28x1.75- 1020gperformance Linescellent Quality for Intensive Use. These are the best value for money tires.winskinaditional rubber coating on the side that protects against cuts.greenguardprotation Belt with a thickness of 3 mm in extremely elastic natural rubber and one third made from recycled latex products.e-bike ready 50spedal tires are necessary for fast e-bikes. These Tires are optimized to withhstand Higher Averal Stresses and Speeds Than.