Quote Originally Posted by Triathlete View Post
You might be able to air up one tire that is a few pounds low and thats about it before it over heats and fries.
Not true - the Cobra unit that I have will punch all four tires (31") from 15-35 lbs without burning up or even consuming the entire battery. But it does take awhile as Marlin mentioned, probably 3-5 minutes per tire.