How long does it take to inflate a 285/70R17 tire?
A 285/70R17 tire (about 32.7 inches tall) holds roughly 96 liters. Raising it from 30 to 35 psi takes about 2 min 20 s with a compact 12V or cordless inflator, and filling it from flat to 35 psi about 16 min 18 s, or 6 min 0 s with a heavy-duty compressor.
VIAIR 85P/00085 Portable Tire Inflator, 12V Air Compressor for Cars & SUVs
A heavy-duty inflator suits a 96 liter tire: it moves enough air to fill one without overheating.
How long for each inflator class?
Times for one 285/70R17 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 | 33 L | 2 min 20 s | 1 min 29 s | 51 s |
| Top up 25 to 35 psi | 65 L | 4 min 39 s | 2 min 58 s | 1 min 43 s |
| Low tire 15 to 35 psi | 130 L | 9 min 19 s | 5 min 56 s | 3 min 26 s |
| Flat 0 to 35 psi | 228 L | 16 min 18 s | 10 min 22 s | 6 min 0 s |
What do the numbers in 285/70R17 mean?
285 is the section width in millimeters. 70 is the sidewall height as a percentage of the width, here 200mm. R17 means radial construction on a 17 inch rim. Together they give an overall diameter of about 32.7 inches and an internal volume of about 96 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 9 min 19 s with a compact unit.
Inflators and a gauge for 285/70R17 tires
Prices change often.
Nearby tire sizes
Frequently asked questions
What is the air volume of a 285/70R17 tire?
About 96 liters, estimated from the sidewall size: 285mm wide, a 70 percent sidewall (200mm) and a 17 inch rim. To add 5 psi you pump in about 33 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 285/70R17 tire?
Yes, but slowly: a flat 285/70R17 takes about 16 min 18 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 6 min 0 s without stopping. Always inflate to the door-jamb placard, not the sidewall maximum.
How much does a 285/70R17 tire lose in cold weather?
Like every tire, about 1 psi per 10 F drop. A 285/70R17 set to 35 psi at 70 F reads about 30 psi at 20 F. Put back the 31 liters of air it is missing when you check it on a cold morning.