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 well casing 25c 120 tpi casing tread 23c dual compound bead aramid centre compound 70a shoulder compound 60a flat protection blackbelt psi 115125 also available in 2528