The Strada 25 Open is a high performance road clincher with a bit of extra width for training or racing on rougher roads. Challenge designs the Strada with a supple 300 TPI carcass and “open tubular” construction, meaning this handmade clincher rides just like a tubular. A dense layer beneath the tread, which they call PPS, prevents punctures and cuts without slowing you down. The exclusive rubber compound and chevron textured tread deliver outstanding grip in wet or dry conditions.