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 Like a Pro, Anywhere, Anytime!

BUILT TO ENDURE - Heavy-duty aluminum build with anti-vibration tray ensures durability on every adventure.
PACK GO READY - Includes deluxe carry bag and 25ft braided hose for ultimate portability and convenience.
RAPID TIRE RESCUE - Inflates a 35" tire from 15 to 30 PSI in under 3 minutes—get back on the road or trail fast.
POWER UP INSTANTLY - Direct 12V battery clamps deliver maximum current for rapid inflation—no weak plugs here.
ALL TERRAIN COMPATIBLE - Perfect for trucks, SUVs, motorcycles, and side-by-sides—versatility meets power.

The VIAIR 400P Portable Tire Inflator is a rugged 12V compressor designed for trucks, SUVs, and off-road vehicles. Delivering up to 150 PSI with a 2.3 CFM airflow, it inflates tires quickly and reliably via direct battery clamps. Lightweight and compact, it comes with a deluxe carry bag, braided hose, and multiple adapters—making it the ultimate on-the-go inflation solution for professionals and enthusiasts alike.

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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	25ft Inside Braided 5-in-1 Inflator/Deflator Air Hose with Inline 100 PSI Gauge, 3pc Inflation Tips Kit, 400P Original Portable Compressor, Deluxe Dual Compartment Carry Bag, Presta Valve Adapter
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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