Questions and Answers for VIAIR 85P Portable Compressor Kit Cig Lighter 12-Volt(12v), Tire Inflator Pump w/ Screw-on Chuck For up to 31" tires

A:  I don't see why it would not work for your tire size. I don't know my tire size, but my car's tires need a higher-than-normal 42 psi pressure, and this compressor works great. I am very happy with it, it is much sturdier and has more solid construction than many other cheaper compressors. The valve that attaches to the tire screws on instead of the cheaper ones where you flip a lever. Previously I had a compressor with a flip-lever valve, and it broke after a few months. The only disadvantage of a screw-on valve is that you must fill air to a higher psi than what you need because there will be some loss in the process of disengaging the valve.

A:  Yes, the engine should be running

A:  No, you just need the ignition on but not running.

A:  The ignition key needs to be in the accessories position for the cigarette lighter to have power.

A:  1.26 CFM Thank you

A:  This unit has 1.83 CFM compressor.