I am using this product to inflate a 235/50R18 (standard size) tire on a car. The tire pressure was very low, it was 5. It took a fully charged battery to get the pressure up to just 16psi. I then had to charge the battery and wait until it was only filled to 26psi. This product is very convenient, but it requires a setting where it can be plugged in and you can keep using it, or a setting where the battery lasts longer. It should also have a longer hose. Then it should be worth 5 stars