Analog Durometers arrow Rex Gauge Durometers Tire Type A Durometer

Tire Type A Durometer

Part#: Rex 2100
Supplier: Rex Gauge Durometers
Calibration Certificate: available on request

Tire hardness can be a critical factor in setting up a race car. A tire that's too hard may sacrifice traction, while a tire that's too soft may give great traction but wear too quickly, and an unmatched set of tires may result in an ill handling car. To properly set up a car, a measure of tire hardness is necessary, and the easiest and most cost-effective way to obtain such a measure is to use a durometer.

The Type A durometer as specified by ASTM D-2240 is the gauge used by tire manufacturers to measure hardness of tire rubber. The gauge gives readings of hardness in durometer points on a scale of 0-100, with 100 being the hardest reading. Some race tires come from the factory with the durometer hardness noted on the side wall, but factors such as ambient temperature, track temperature, usage, and age of the tire can change the actual hardness of the tire from the factory hardness.

Rex Gauge Company's 2100 Tire Durometer allows racers to quickly and accurately make checks of tire hardness. Unlike other "racing durometers" (which are just relative hardness gauges), the Rex 2100 is calibrated to the ASTM D-2240 standard for durometer hardness and is traceable to N.I.S.T. Thus, the Rex 2100 allows comparison with the factory tire specifications.

The 2100 is a handheld gauge weighing only 4.2 oz. The indicator case, bezel, and barrel are all billet machined aluminum. Because of its billet construciton, and the fact that the durometer is manufactured in the USA by Rex Gauge Company (an industry leader in durometers for over 60 years), the craftsmanship that goes into the 2100 is unsurpassed. The gauge is furnished with a carrying case and a one year warranty.


  • Includes NIST Calibration Certificate
  • Conforms to ASTM D-2240
  • Custom Made Carrying Case
  • Holds Reading Until Reset

how to use

Hold the durometer in a near-vertical position and press the foot of the gauge firmly against the specimen, (but not so firmly as to imbed the foot into the surface of the material). The indicator hand will come to a stop, indicating the durometer (hardness value) of the specimen. The hand will remain at this reading, even when removed from the specimen. To reset for the next reading press reset button at the top of the gauge, and the indicator hand will return to the proper at rest position. Repeat above steps for each use. H-1000 At Rest Position: 90-95 (Types A, B, and O), Zero (Types C, D, and DO) 2100 At Rest Position: Zero

Ordering info

SKUDescriptionUnitPriceIn Stock
Rex 2100Rex Gauge Durometers Tire Type A Durometerpiece 0

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