How long does it take to inflate a 245/75R16 tire?
A 245/75R16 tire (about 30.5 inches tall) holds roughly 71 liters. Raising it from 30 to 35 psi takes about 1 min 43 s with a compact 12V or cordless inflator, and filling it from flat to 35 psi about 12 min 4 s, or 4 min 27 s with a heavy-duty compressor.
VIAIR 85P/00085 Portable Tire Inflator, 12V Air Compressor for Cars & SUVs
A heavy-duty inflator suits a 71 liter tire: it moves enough air to fill one without overheating.
How long for each inflator class?
Times for one 245/75R16 tire using delivered flow at tire pressure, which is roughly 40 to 50 percent of the rated figure on the box: about 14, 22 and 38 liters per minute for the three classes.
| Job | Air to pump | Compact | Fast cordless | Heavy-duty |
|---|---|---|---|---|
| Top up 30 to 35 psi | 24 L | 1 min 43 s | 1 min 6 s | 38 s |
| Top up 25 to 35 psi | 48 L | 3 min 27 s | 2 min 12 s | 1 min 16 s |
| Low tire 15 to 35 psi | 97 L | 6 min 54 s | 4 min 23 s | 2 min 32 s |
| Flat 0 to 35 psi | 169 L | 12 min 4 s | 7 min 41 s | 4 min 27 s |
What do the numbers in 245/75R16 mean?
245 is the section width in millimeters. 75 is the sidewall height as a percentage of the width, here 184mm. R16 means radial construction on a 16 inch rim. Together they give an overall diameter of about 30.5 inches and an internal volume of about 71 liters, which puts it in pickup and large SUV territory where inflator size matters.
Check pressure cold, before driving. All four tires from 30 to 35 psi take about 6 min 54 s with a compact unit.
Inflators and a gauge for 245/75R16 tires
Prices change often.
Nearby tire sizes
Frequently asked questions
What is the air volume of a 245/75R16 tire?
About 71 liters, estimated from the sidewall size: 245mm wide, a 75 percent sidewall (184mm) and a 16 inch rim. To add 5 psi you pump in about 24 liters of free air, because each 14.7 psi of pressure equals one tire volume of outside air.
Can a small tire inflator fill a 245/75R16 tire?
Yes, but slowly: a flat 245/75R16 takes about 12 min 4 s with a compact unit, which is past the roughly 10 minute duty cycle many are rated for, so you may need a cool-down break. A heavy-duty 12V compressor does it in about 4 min 27 s without stopping. Always inflate to the door-jamb placard, not the sidewall maximum.
How much does a 245/75R16 tire lose in cold weather?
Like every tire, about 1 psi per 10 F drop. A 245/75R16 set to 35 psi at 70 F reads about 30 psi at 20 F. Put back the 23 liters of air it is missing when you check it on a cold morning.