Using competition rubber compounds, sourced from Michelin road bike tires, the Pilot SX features a tread pattern intended for racing on soft tracks or in autumn and winter conditions, while the Pilot SX Slick features a marked and very shallow tread pattern which is suitable for racing on hard tracks, or in spring and summer conditions. In summary, the Pilot SX Slick offers maximum race performance while the Pilot SX provides more grip. Both tires are tubeless ready (TLR) to reduce weight and improve rolling resistance by around 15 to 25 percent compared to the same tire running with an inner tube. However, as with all Michelin TLR bicycle tires, the BMX Racing Line tires can also be used with inner tubes. Both models feature a robust three layer 60 TPI casing to resist damage, improve durability and cope with tire pressures of up to 5 bars. Features: 60 TPI Folding Tire Specifications: Wheel Size: 20" Tire Pressure: 2-5 Bar Weight: 420g