Add bead-to-bead puncture protection and a supple 170 TPI casing, and its a perfect choice for speed, grip and durability in challenging terrain.Features:GX-S dual compound tread technology for durable, fast-rolling efficiency.Short centerline knobs for speed and grip.Chunky outer knobs for maximum confidence in loose, wet or technical corners.Dual Shield puncture protection combines Race Shield+ and X-Shield for outstanding Bead-to-Bead tread and sidewall protection.Lightweight 170 TPI casing gives a smooth, supple ride quality.Size: 700 x 40cGX-S Dual CompoundGX-S dual compound technology features a two-compound tread. The fast-rolling middle section improves rolling efficiency. The side sections use a softer side compound for better grip and cornering traction in variable conditions and terrain.Dual Shield Puncture ProtectionExclusive Race Shield+ and X-Shield combine for outstanding bead-to-bead tread and sidewall protection.