Head-to-head · Best Portable Tire Inflators

Slime Cordless Pro Power vs Viair 88P

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Slime Cordless Pro Power comes out ahead by a narrow margin (4.5 vs 4.4). The gap is mostly about drivers who want a foolproof cordless inflator with a 12V backup and automatic shut-off — read the strengths below before deciding.

Higher ratedRanked #2 in Best Portable Tire Inflators

Slime Cordless Pro Power

4.5

2 sourcesall derived$116.04as of Aug 1

Self-contained is the Slime Cordless Pro Power's advantage: it runs cordless on its own battery, drops back to a 12V cable when that dies, and auto-stops once it hits your target pressure. Pro Tool Reviews scored it 9.4/10 and Automoblog 85/100. It works slower and at lower pressure than the Milwaukee and Viair, yet the hybrid power and auto shut-off make it the most foolproof choice for most drivers.

Strengths

— Hybrid design works cordless on its internal battery or wired via the included 12V cable
— Inflate-Right Technology auto-shuts off at the set pressure, no gauge-watching needed
— Fills up to three standard car tires from flat per charge

Watch-outs

— Roughly four-hour USB-C recharge is slow
— Fills more slowly than the Milwaukee M18 or Viair 88P at about three minutes per tire
— 99 PSI ceiling is lower than the 120-150 PSI rivals

$116.04 · Check Price on Amazon Full review →

Ranked #3 in Best Portable Tire Inflators

Viair 88P

4.4

2 sourcesall derived$89.89as of Aug 1

Trucks, RVs and off-road rigs that get their pressures reset often are what the Viair 88P is built for. GearJunkie's testing had it filling tires in roughly half the time of the next-fastest unit, and Pro Tool Reviews named it best for trucks. There is no auto shut-off and it connects by battery clamps, but for serious heavy-duty inflation it is the value workhorse.

Strengths

— Crushed the competition in truck-tire testing, filling a 215/70 R16 from 10 to 45 PSI in about 3 minutes
— 120 PSI ceiling and a 25-minute duty cycle handle off-road and 33-inch tires
— Long 16-foot heavy-duty rubber hose with a quality brass chuck reaches all four tires easily

Watch-outs

— No automatic shut-off, so you must watch the gauge to avoid over-inflation
— Gets hot, up to about 160F after roughly 12 minutes under load
— Clamps connect to the battery, more involved than a 12V plug

$89.89 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

Slime Cordless Pro Power

The most self-contained option, the only one here that runs cordless and still has a 12V fallback if the battery dies. It is slower and lower-pressure than the Milwaukee M18 Inflator (2848-20) and the Viair 88P, but more foolproof than older corded inflators and a step up in features from the budget AVID Power.

Viair 88P

The heavy-duty speed champion, faster on big truck tires than the cordless Milwaukee M18 Inflator (2848-20), the hybrid Slime Cordless Pro Power and the budget AVID Power. It shares the corded, battery-clamp approach with older corded inflators but reaches a higher 120 PSI for 33-inch tires.

Specs side-by-side

Spec	Slime Cordless Pro Power	Viair 88P
Max PSI	99	120
Power Source	Internal battery + 12V cable	12V battery alligator clamps
Fill Time	~3 min per tire	—
Display	Clear-view LED	—
Auto Shut-Off	Inflate-Right Technology	No
Max Tire Size	—	33 inch
Weight	—	~5 lb
Voltage	—	12 volts_of_direct_current

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