Most consumer cordless tyre inflators choke above 50 psi. Campervan tyres routinely run 65–80 psi when fully loaded. This mismatch is why so many camper owners give up halfway through topping up and end up driving on under-inflated tyres — burning fuel, killing tyre life and increasing blowout risk. Here are the inflators that actually keep up.
Fiat Ducato 16-inch CP-rated tyres often spec 65–80 psi rear when loaded. Sprinter rears push 80+ psi. Most cordless inflators are rated to 120 psi maximum but slow to a crawl above 45 psi. By the time you've topped one rear tyre, the inflator is overheating. You need either a 12V plug-in unit with a proper continuous-duty motor, or a high-end cordless rated for sustained work.
The chassis-cab door sticker shows the unladen pressure. The motorhome manufacturer's plaque (often inside a cupboard) shows the figure for the fully-loaded MAM. Always use the higher figure when touring — under-inflated rears at 3.5 tonnes is how rear blowouts happen.
On a campervan the 12V cigarette socket is always within reach and the leisure battery is typically charged. A proper 12V heavy-duty inflator (Ring RAC900 or RAC830, Halfords HDi) will sit happily at 80 psi for the time it takes to do all four corners. Cordless versions either run out or overheat.
Reaching a rear inner-twin tyre on some coachbuilts means 1.5m+ of hose. Most cheap inflators come with 60cm. Buy one with at least 1m hose, ideally 1.5m, or buy an extension.
Inflator gauges are 'good enough' but degrade. A separate calibrated dial gauge (TyrePal, Joes Racing) lives in the glovebox, gets used pre-trip, and survives years. The combination of accurate gauge + heavy-duty inflator is the proper setup.
Aftermarket external TPMS sensors (TyrePal TC215, FOBO Tire 2) screw onto the valves and warn of slow leaks in real time. Brilliant safety upgrade — but no substitute for monthly pre-trip pressure checks.
Refer to the motorhome manufacturer's plaque (typically inside a wardrobe or under the bonnet). Most loaded coachbuilts run 65–80 psi rear, 55–70 psi front.
Up to about 45–50 psi, yes. Above that, most consumer cordless units slow to uselessness or overheat. Get a heavy-duty 12V.
Yes — slow leaks at 80 psi can turn into blowouts surprisingly quickly under load. £100–£150 well spent.
Before every trip and weekly during long tours. Tyres lose 1–2 psi per month even sound.
CP-rated (camping) tyres are reinforced for sustained high load and pressure. Don't substitute standard van tyres without checking load index.
Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].