A 12V tyre inflator is one of those things you buy once and keep in the boot. The AstroAI S1 is a corded model: it plugs into the car’s 12V socket and stops when the tyre reaches the pressure you set.
If you buy through our links we may earn a commission, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. We have not tested this inflator. This article sets out what Amazon UK’s listing says, what the maker’s shop promises, and what we would check first.
What the listing says
The listing, which we read on 26 October 2026, says you start the engine, push the plug into the 12V socket, clip the hose to the tyre valve and set the pressure with the plus and minus buttons. The inflator then stops by itself at that pressure.
| Item | What the listing says |
|---|---|
| Power | 12V DC from the car socket; it cannot run from a USB port |
| Maximum pressure | 150 PSI |
| Units | PSI, kPa, bar and kg/cm² |
| Cable and hose | 3 m power cord and a 0.48 m air hose |
| Size and weight | 13 × 6.5 × 17 cm, 700 g |
| Noise | 85 decibels |
| In the box | Two nozzles, a needle valve adapter, a Presta-Schrader adapter, a spare fuse and a manual |
| Light | An LED light that comes on when the unit is powered |
| Protection | Power cuts off at 16 V or above, or at 28 A or above |
| Speed (the maker’s claim) | 30 to 36 PSI in under a minute and 0 to 36 PSI in under five minutes, on a 185/55 R14 tyre |
These are the seller’s claims. We have not measured any of them.
What the maker promises
AstroAI’s UK shop says its products come with a free automatic warranty that can be extended for up to three years, and a 30-day money-back guarantee. The shop page we read does not name the S1, so check the terms that apply to the unit you buy, and whether you buy from Amazon or from the maker.
The listing itself offers 30 days to return the item, and says the unit cannot run from a USB port. It does not state a maximum running time before the pump must cool, and we did not read the manual, so check that figure there. The 85 decibels on the listing is loud, about the level of a busy road, and the LED light comes on whenever the unit is powered.
What to check before buying
- Reach. A 3 m cable and a 0.48 m hose are fine for a small car. Measure from your 12V socket to the furthest tyre if you drive something longer.
- Your socket. The listing gives the power cut-off levels but not the normal current the unit draws, and we did not read the manual. Check it against the fuse rating of your car’s 12V socket.
- Accuracy. We found no independent test of this model’s display. Which? says its inflator tests check whether the display matches the real pressure in the tyre. Compare the S1’s reading with a gauge you trust.
- Your correct pressure. Use the figure in your car’s handbook or on the door frame, not a round number.
- How long it can run. A small compressor heats up, and the listing gives no running limit. Look for one in the manual and let it cool between tyres.
- A newer version. The listing itself points to a newer AstroAI model with a large screen and smart preset. Compare the two before you choose.
Should you buy it?
Our reading: it is a simple corded inflator, and its selling points are the basic ones, a digital display, a preset and an automatic stop. The things to weigh are noise, heat and cable reach. We cannot tell you how accurate it is or how long it lasts.
If you want a model that has been tested independently, Which?, What Car? and Expert Reviews have published tests of other inflators. We did not find one of the S1. You can see the price on Amazon UK (affiliate link), and the price there changes.
For other buying guides in this section, see what Engadget’s review found about the Even Realities G2 smart glasses and the Oppo Find X10 and what to know before you buy.
What we could not confirm
We did not test the inflator, read the user manual or find an independent test of this model. We could not open the Which? article, so we rely on its published summary. We do not quote the listing’s price, ratings or sales ranking: they change, and Amazon does not allow us to reproduce its customer reviews and ratings.
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