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Hoosier Asphalt .25 Midget Tire 32.0/4.5-5 R50 - 15042R50 Hoosier Racing Tires
Availability: Ships Today
Vendor Name: Hoosier Racing Tires
Line Code: HRT
Part Number: 15042R50
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Tire Size   32.0/4.5-5
Tread Width   4.5"
Approximate Diameter   10.25"
Approximate Circumference   32"
Recommended Rim Width   5-6"
Measured Rim Width   5.5"
Section Width   5.5"
Compound   R50
Application   Asphalt Quarter Midget



Hoosier Asphalt .25 Midget Tire 32.0/4.5-5 R50 - 15042R50



A35 54-56 Vega MBM
R50 54-56 MG Yellow




Asphalt Tracks:
The A35 is a high traction compound that will work well on tracks that lack grip, such as colder track conditions, slick or green track surfaces. The A35 will grip quickly with little heat and will be consistent throughout long green lap runs. 
Indoor Surfaces:
The A35 is more appropriate on indoor track surfaces that are tacky and high grip from the buildup of rubber in the corners. 




The 31.0/4.5-5 will measure approximately 31” on a 5x5 wheel at 8 psi. Compounds available in this size include D10, D20A, RD40, A35 & R50. Please refer to the ‘Dirt QM’ page for dirt compound applications.  

The 32.0/4.5-5 SH will measure approximately 31.5” on a 5x5 wheel at 8 psi. Compounds available in this size include D20A & A35. Please refer to the ‘Dirt QM’ page for D20A compound applications.

The 32.0/4.5-5 will measure approximately 32” on a 5x5 wheel at 8 psi. Compounds available in this size include D10, D20A, RD40, A35 & R50. Please refer to the ‘Dirt QM’ page for dirt compound applications.

The R50 tire has a stiffer construction that provides more grip for higher powered classes that utilize a locked LR hub on their car. The R50 is designed to work in the same conditions as the A35 compound. The R50 is also designed to keep the car free on high heat, high traction surfaces.




Recommended starting pressure for outdoor asphalt tracks is between 9-11 psi on the left side and 11-13 on the right side. 
Pressures can be higher or lower depending on track condition. 
Indoor pressures range from 5-7 psi on the left and 7-10 psi on the right side. 
It is recommended that you "scrub" in your race tires. This procedure involves warming your tires up over a couple of laps, increasing your lap times over the next couple of laps until you reach your fast time. This should be followed by a cool down lap. The tires should be removed and allowed to cool naturally for 24 hours. This can also be done during a qualifying session. 




Every Hoosier race tire has a four character serial code embossed into ONE sidewall of the tire (example: J7B9). To be consistent when mounting from set to set, the tire should be placed on the rim so that the serial code faces towards the left side of the vehicle. This applies to tires without directional arrows. On tires with directional arrows, please mount the tire onto the rim so that the tire travels in the direction of the rotational arrow.

Once the tire is on the rim, we recommend placing the tire inside a mounting ring and adjusting the ring to fit snug around the tire. We highly advise using the mounting ring as we believe not using it can over stretch the carcass leading to inconsistent sizing. Never exceed 40 psi to seat beads. Once the tire has seated onto the rim, it is important the tire be initially stretched to about 10 psi over cold starting pressure to get the tire to its proper "profile". The tire should be set at this pressure for a few minutes and then dropped to the desired race pressure. The max inflation pressure is 57 psi (4.0 kg/cm2). Never exceed the max inflation pressure under any circumstance.


Some parts are not legal for use in California or other states with similar laws / regulations.

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