Answers to questions regarding KUMHO MX tires

[AMoore]

I was discussing Kumho tire pressures with a few of you at the track.  I sent the following e-mail to a tech at Kumho and received the following response:

 
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I have Kumho MX tires on my tracks set up 1993 Porsche 911. The tires are larger than stock but fit well because of suspension upgrades. I realize that the tires permit over 50 lbs of pressure; however, can you advise as to a good pressure for these tires (hot and cold). I believe the car manufacturer recommendations may be too low as I am experiencing sidewall flex on the track. Thank You,

 



Aaron,

Thank you for contacting Kumho Tire, track situations require an adjustment to both the car and tire. The MX was designed as a ultra high performance street tire. There will be certain limitations as to the max performance on the track, especially with a unique car design such as the rear engine Porsche. That being said I'll give you some basic information as to the pressures, keep in mind that there are many factors such as camber, toe, etc that will have a direct effect on the wear and performance. You will want to increase cold pressures to aprox 40-42 PSI as a starting point, generally the tire will rise 10 PSI under severe conditions. The higher pressures will keep the sidewall from flexing as bad.  Because of the design of the car and tire you won't be able to get rid of the sidewall flex completely but the higher pressures will help.  Another suggestion would be to increase camber (you didn't indicate the settings) and that will help with the tire and feel of the cornering and turn in. I hope this helps, let me know if you have any other questions.

[size=2]~Jason Myers

Motorsports Services

 

Kumho America Technical Center

711 South Cleveland-Massillon Road

Akron, Ohio 44333

KumhoTireUSA.com

 

 
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