Few 4x4 accessories offer as many advantages as readily available on-board air, and ARB understands exactly what off-roaders and overlanders need. Considered a staple by 4x4 owners around the world, the ARB Single Motor On-Board Air Compressor (CKMA12) provides an immediate source of compressed air anywhere a 12V power source is available — the perfect companion for adjusting tire pressure, re-inflating after the trail, and tackling repairs in the backcountry.
Air Down, Air Up — On Demand: Tires perform best at a pressure that suits the terrain. Highway driving calls for higher pressure, while airing down dramatically improves your traction in sand, rock, and mud. The CKMA12 gives you the freedom to adjust your tire inflation to match the conditions, then air right back up when you hit the pavement.
Peace of Mind on the Trail: It's not unusual to pick up several punctures in a single day of extreme off-road travel. Paired with a quality tire repair kit, the CKMA12 lets you re-inflate repaired tires on the spot, giving you the independence and peace of mind to explore farther from help.
Built Tough, Built to Last: The CKMA12 features a hard-anodized cylinder bore for reduced friction and a Teflon-impregnated carbon fiber piston seal engineered for maximum trouble-free life. Constructed entirely from lightweight, high-strength engineering-grade materials, it's sealed for moisture and dust resistance and built to perform in harsh environments.
Smart, Reliable Design: An anodized mounting bracket dissipates motor heat and lets the compressor be repositioned 180 degrees on vehicle-mounted installs. The motor is internally thermal-protected against extreme temperature damage, and the unit comes equipped with an over-pressure safety valve and a heavy-duty maxi-fuse for professional in-line circuit protection. Quality components throughout mean quiet operation and extra-long life.
Factory Tested for Confidence: Every ARB air compressor is individually leak tested, current-draw tested, and flow tested under load at the factory before packaging. ARB's after-sales service is second to none, with many compressor components readily available and easily sourced.
Don't let deflated tires or a lack of compressed air hold you back from exploring the rugged terrain you love. Invest in the ARB Single Motor On-Board Air Compressor today and tackle every off-road challenge with confidence.
What can I use the CKMA12 for? The CKMA12 is an on-board air source ideal for airing down before the trail and airing back up afterward, plus re-inflating repaired tires in the field. It's a staple accessory for any off-road or overland rig.
Will it run my ARB Air Lockers? The CKMA12 is primarily designed for tire inflation. If running Air Lockers is your main goal, ARB's twin-motor or brushless models are better suited for the higher demand — but the CKMA12 remains an excellent, affordable choice for on-board air and tire work.
What does the 50% duty cycle (30/30) mean? It means the compressor is designed to run for roughly 30 minutes, then rest for 30 minutes before continued use. That's plenty for airing up a set of tires, though heavy back-to-back use is better suited to ARB's 100% duty cycle twin or brushless models.
Is it weather and dust resistant? Yes. The CKMA12 is sealed for moisture and dust resistance, carries an IP55 rating, and is internally thermal-protected against extreme temperature damage, so it holds up in tough conditions.
Can I mount it in a tight space? Yes. Its compact footprint and anodized mounting bracket — which allows the compressor to be repositioned 180 degrees on vehicle-mounted installs — make it one of the easiest ARB compressors to fit into a build.
Should I choose the CKMA12 or step up to the Brushless Single (CKBLA12)? The CKMA12 is the proven, budget-friendly choice for tire inflation. The Brushless CKBLA12 offers more airflow, a 100% duty cycle, IP67 rating, and smart electronics — worth the step up if you want faster air-ups or plan to run lockers and tools more often.
What warranty does it come with? Every ARB CKMA12 is backed by a 3-year manufacturer warranty, plus the Recon Recovery 1-Year Price Lock Guarantee.
3-Year Warranty
What is duty cycle? Duty cycle describes how long an air compressor can run before it needs to rest and cool down. Air compressors generate heat while they work, and running one continuously past its rated limit can cause overheating and shorten its lifespan. The duty cycle tells you the ratio of "run time" to "rest time" so you know what to expect during use.
What does a 50% (30/30) duty cycle mean? The CKMA12 carries a 50% duty cycle, expressed as 30/30. That means it's designed to run for approximately 30 minutes, then rest for approximately 30 minutes before being run again. The two numbers represent run time and rest time in minutes, and the 50% figure reflects that it runs for half of any given cycle.
In real-world terms, that's plenty of capacity to air up a full set of tires after a day on the trail. The 30-minute run window comfortably covers most tire-inflation jobs. Where duty cycle matters more is heavy, continuous use — for example, repeatedly running air tools or airing up oversized tires back-to-back without pause.
When should I consider a higher duty cycle? If you frequently run air tools, engage ARB Air Lockers often, or want to air up large tires repeatedly without waiting, an ARB compressor with a 100% duty cycle — such as the Brushless Single (CKBLA12), Brushless Twin (CKBLTA12), or Twin Motor (CKMTA12) — is the better fit. A 100% duty cycle means the compressor is built to run continuously without a mandatory rest period.
