The 21,000 series dynamometer offers the best horsepower and speed ratings in a compact unit. Consisting of twin 36" diameter wide rolls. The total mechanical equivalent inertia is approximately 2400 lbs. Maximum axle weight is 12,000 lbs, track width range is 102". The 21,000 series is perfect for diesel, high torque and high speed applications. The 21,000 series dyno comes standard with our X Factor Knurling option which provides the highest traction over all other competitors. The 21,000 is easily the world's best engineered dynamometer as the eddy brake sits directly on the shaft between the two rolls - no need to couple with a belt or universal joint all power is directly transferred from the wheels to the load cell. The 21,000 series is not only designed for ultra-high horsepower vehicles but provides the utmost in accuracy and repeatability for all testing scenarios -drag strip, steady state, acceleration and coast-down tests. Large roll dyno's offer minimal tire deformation and maximum contact patch area providing repeatability and accuracy from test to test.SPECIFICATIONSTORQUE: 21,000 INERTIA: 2400 MAX SPEED: 240+MPH ROLL DIAMETER: 36 Inch AIR REQUIREMENTS: 60 PSI POWER REQUIREMENTS: 220/240 Volt OPTIONSDrag TreePit Covers or Above Ground Kit4 Post LiftWireless ODBIIDC Fan5 Gas Analyzer PIT DIMENSIONSEFI classes and training on the use of this product is available for novice and experts alike please contact. TUNERTEK