18.4/20.5x16.1 tr218a m/ultra tube (3)

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This is a MARATHON ULTRA (M/ULTRA) severe service rated tube and is approximately 25% to 40% heavier in construction than standard service rated tubes. We recommend the use of these tubes in any application involving high heat, sustained high speed, extra heavy loads, or any instance when the chance of a catastrophic tube failure is unacceptable for the application. These are normal specification tubes for forestry and low profile radial tractor tyres and are also available for trucks, forklifts and other extra heavy duty applications.