ET Street™ R (Bias), ET Street® R, ET Streetl® S/S, Pro Drag Radial, Pro Bracket Radial and ET Drag® Air Pressure Guidelines

October 13th, 2017

Updated 8/15/17

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
10 P.S.I. AND UP
8 P.S.I. AND UP
6 P.S.I. AND UP

PRO DRAG RADIAL AND PRO BRACKET 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

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 R (Radial) AND ET STREET S/S

On the racetrack DO NOT use starting pressures below 13 psi.
Recommend pressures: 14-18 psi
For suggested highway use inflation pressure in Mickey Thompson ET Street Radial tires, contact the Mickey Thompson Tires tech department at (800) 222-9092 (Option 4).

Please have your OE specified tire size and OE cold inflation pressure (located on the vehicle’s tire placard), as well as the new tire size available for the tech staff.

ET DRAG JR.

3625: 4 – 8 psi
3645: 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.