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ET STREET, ET STREET RADIAL, AND ET DRAG AIR PRESSURE GUIDELINES

General Technical Articles

PROPER AIR PRESSURE
Proper air pressure is critical to the best performance of your ET Drag or ET Street racing tires. Mickey Thompson strongly suggests investing in a good tire pressure gauge and that you keep accurate and complete records of each pass. This will aid you in becoming a consistent performer. Recommending air pressure is not easy, since there are so many variables that affect it: i.e. weight distribution, transmission, chassis set-up, wheel size, etc. To help you, we have broken down the types of vehicles into the following categories with a recommended starting point for the correct air pressure. These pressures are for off-highway use only and based on optimum chassis and drivetrain setups. Keep in mind that these are purely starting points. Actual optimum air pressure may vary significantly. If you have been running another brand of slick on your racecar, we generally recommend you start with the same air pressure you were running and go up in ½ pound increments until you get the best performance. Most racers will usually end up with ½ to 2 pound more air pressure in a Mickey Thompson tire. Note: Many racers feel that "Less is Better" with regard to air pressure. This is not always the case. While there are exceptions to every rule, we have found higher pressure generally works best with Mickey Thompson Tires. Not only do the higher pressures lead to quicker times, but they also contribute to a safer, more stable ride at the finish line.

ET DRAG® AND ET STREET™
VEHICLE WEIGHT TIRE SIZE AIR PRESSURE
UNDER 2,500 POUNDS UNDER 2,500 POUNDS UNDER 32" DIAMETER OVER 32" DIAMETER 7 P.S.I. AND UP 5 P.S.I. AND UP
2,500 TO 3,000 POUNDS 2,500 TO 3,000 POUNDS 2,500 TO 3,000 POUNDS UNDER 30" DIAMETER 30-33” DIAMETER OVER 33" DIAMETER 10 P.S.I. AND UP 8 P.S.I. AND UP 5.5 P.S.I. AND UP
OVER 3,000 POUNDS OVER 3,000 POUNDS OVER 3,000 POUNDS UNDER 30" DIAMETER 30-33” DIAMETER OVER 33" DIAMETER 12 P.S.I. AND UP 8 P.S.I. AND UP 6 P.S.I. AND UP

PRO DRAG RADIAL
2,500 TO 3,000 POUNDS 2,500 TO 3,000 POUNDS UNDER 30" DIAMETER OVER 30" DIAMETER 16 P.S.I. AND UP 8 P.S.I. AND UP
OVER 3,000 POUNDS OVER 3,000 POUNDS UNDER 30" DIAMETER OVER 30" DIAMETER 16 P.S.I. AND UP 12 P.S.I. AND UP
  • When working with ET Drag Radials use 1 psi adjustments to see change.
  • A radial will perform quicker the more air you can run.

ET DRAG MOTORCYCLE

MCR² (3295): Quarter Mile in 7 seconds, Turbo Bikes, 6 - 10 psi

Quarter Mile: in 8 to 9 seconds, 15 – 19 psi

Quarter Mile: High 9 seconds and slower, high twenties to mid thirties

3210 ET Front: 35-40 psi

3053M, 3158M (Pro Stock – Pro Mod): 4.0 – 6.0 psi, wheelie bar 2” - 2 1/8”

3064M: 4.0 – 6.0 psi, Wheelie bar 2” - 2 1/8”

3065M: 6.0 – 9.0 psi, Wheelie bar 1 ¾”

3073M: 7.0 – 8.0 psi, Wheelie bar 1 ¾”

3220: 7.5 – 10 psi, Wheelie bar 2” - 2 1/8”

3221, 3222: 6.5 – 8.0 psi, Wheelie bar 2” - 2 1/8”

These recommended pressures are guidelines only, actual pressures may vary. Wheelie bar settings are with the front end extended and can vary as well.


ET STREET RADIAL

On the racetrack DO NOT use starting pressures below 11 psi.

Recommend pressures for:

P295 and larger sizes: 12-16 psi

P275 and smaller sizes: 14-18 psi

On the highway we recommend running 75% -100% of maximum psi stated on the sidewall of the tire. This will vary depending on the weight of the vehicle.

ET DRAG JR.

3621: 4 – 8 psi

3644: 4 – 8 psi

The technical information provided in this document is to be used purely a guideline. Due to the many varied and different conditions to which racing tires, wheels and tubes are exposed, and because of the manner in which racing is conducted, Mickey Thompson Performance Tire makes absolutely no warranty, expressed or implied, as to the fitment for a general or particular purpose. Racing Tires are Sold As Is.

This is Mickey Thompson DRAG / STREET Technical Bulletin #3. Updated 5/29/09 For more information regarding Mickey Thompson Performance Tire and Wheels Website: www.mickeythompsontires.com E-mail: tech@mickeythompsontires.com Phone: 330.928.9092

 


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