Roubaix tyres are the perfect match for any rider who wants ultimate performance without the harsh ride comfortable large volume 25c casing and a fast rolling 23c tread ensure a supple ride that rolls fast and corners extremely wellgt casing 25c 120 tpi casing gt tread 23c dual compound gt bead aramid gt centre compound 70a shoulder compound 60a gt flat protection blackbelt gt psi 115125 also available in 2528