MITAS Heavy Duty TUBE reinforced front inner tube, 2 mm thick, is designed for off-road and enduro riding in harsh conditions. The inner tube provides extremely high resistance to punctures and tears, even in technical riding and at low air pressures. Includes a reinforced TR6 valve and is suitable for tires in the following sizes: 21" front wheel Suitable for sizes: 2.50-21 / 2.75-21 / 3.00-21 / 3.25-21 / 3.60-21 80/90-21 / 80/100-21 / 90/80-21 / 90/90-21 90/100-21 / 100/80-21 Brand: MITAS An excellent choice for riders looking for reliability, peace of mind and off-road performance.