how long will it take to pump 4 off 265/75/16 from 15psi to 60psi

My tires are 285/75R16 and it takes about 4 minutes to air up from 30 psi to 65 psi (each tire). So, about 16 minutes for all four. The run time is 20 minutes per hour, so no cool down is necessary with the 400P model.

Can it fill 5th wheel tires to 110 PSI ST235/85R16 (G)

The specifications on the manufactures website says the max working pressure of the 400P is 150 psi. Please note the 400P has an 8ft power cord and 25ft air hose. Depending were you will receive power from, you might want to consider also purchasing the 30ft extension hose. Viair part number 00030.

I have 33x12.5.15 inch General Grabber offroad tires, will this compressor work well?

I also have 33x12.5 off road tires that I air down on the trail and use this compressor to air them back up. It works well and it is quick.

The 400p says both 2.3cfm and 2.54cfm while the 300p says both 2.3cfm and 2.4cfm. what is the advantage of the 400p over the 300p, if any?

400P Specifications - 12-Volt / 24-Volt- Permanent Magnetic Motor- Duty Cycle: 33% @ 100 PSI- Max. Working Pressure: 150 PSI- Max. 12V Amp Draw: 30 Amps300 P Specifications 12-Volt- Permanent Magnetic Motor- Duty Cycle: 33% @ 100 PSI- Max. Working Pressure: 150 PSI- Max. Amp Draw: 30 AmpsBasically 400P fills faster than 300P.

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🚗 Inflate your adventure—never get stuck without air again!

READY WHEN YOU ARE - Comes with a deluxe carry bag and anti-vibration tray for easy transport and stable operation anywhere.
BUILT TOUGH LASTS LONG - Heavy-duty aluminum construction with a 33% duty cycle ensures durability and dependable performance.
POWER UP WITH PRECISION - Direct 12V battery clamps deliver reliable, high-current performance for serious off-road and everyday use.
ALL TERRAIN COMPATIBILITY - Perfect for trucks, SUVs, motorcycles, and side-by-sides—one compressor to rule them all.
RAPID INFLATION ZERO WAIT - Inflates a 35" tire from 15 to 30 PSI in under 3 minutes—get back on the road or trail faster than ever.

The VIAIR 400P Portable Tire Inflator is a rugged, 12V-powered air compressor designed for trucks, SUVs, motorcycles, and more. Delivering up to 150 PSI with a 2.3 CFM free flow rate, it inflates tires quickly and efficiently. Featuring direct battery clamps for maximum power, a deluxe carry bag, and an anti-vibration tray, this compact 10.4-pound unit is built for on-the-go reliability and convenience.

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Color	Silver
Size	12V
Style	Original Portable
Weight	17 Pounds
Material Type	Aluminum
Number of Items	1
Number of Pieces	1
Power Source	12.0 volts
Features	Heavy Duty, Portable, Quick Inflation
Tank Volume	2.3 Cubic Feet
Included Components	deluxe carry bag, anti-vibration tray, 5-in-1 inflator/deflator hose and gauge
Batteries Included?	No
Brand	VIAIR
Manufacturer	Viair Corporation
Item model number	400P
Product Dimensions	27.61 x 14.81 x 19 cm; 4.72 kg
ASIN	B000X9AXR8

Viair 400p Portable Tire Inflator Family

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