MMG Combo: Tire Size 16x2.50 + Inner Tube 16x2.50 Fits Electric Bikes, Kids Bikes, Small BMX and Scooters COMBO: INCLUDES TIRE AND INNER TUBE SIZE 16-2.5 Tire 16 x 2.50 designed for Kids Bikes, Electric Bikes (e-Bikes), Small BMX Recomended tire pressure 36 PSI (250 KPa) cold. INNER TUBE: 16-2.5 TR87 Valve Stem* TR87 TR-87, Centered short 90 metal stem (10 mm dia)