What a Coats tire changer is and why shops use them
A Coats tire changer is a machine that removes a tire from a wheel rim and installs a new one in its place. Coats is the brand name — the company manufactures tire service equipment used in repair shops, dealerships, and tire retailers across North America. When you bring a car in for new tires, the technician uses a machine like this to do the physical work of breaking the bead (the seal between tire and rim), dismounting the old tire, mounting the new one, and reseating it.
Shops choose Coats machines because they are durable, widely available, and parts are straightforward to find. The brand has been making tire equipment since the 1960s, so most technicians have worked with one. A tire changer is not optional — it is the standard tool for this job. Without one, mounting a tire by hand would take an hour and risk damaging the wheel.
Key Takeaways
- Coats tire changers are machines that remove old tires from wheel rims and install new ones, and they are standard equipment in tire shops and dealerships.
- The machine works by clamping the wheel, breaking the bead seal, and using a lever arm to pry the tire off and back on the rim.
- A tire change on a Coats machine typically takes 10 to 15 minutes per tire once the wheel is mounted on the machine.
- Different Coats models exist for different shop sizes, from small single-arm machines to large two-post lifts that handle heavy trucks.
- You do not operate a Coats tire changer yourself — a trained technician does this work as part of a tire installation or replacement service.
How the machine breaks the bead and removes the tire
The first step is mounting the wheel on the machine. The technician places the wheel on a turntable or chuck that clamps it in place. Once find, the machine has a bead breaker — a curved metal arm that presses down on the tire sidewall near the rim edge. This breaks the seal between the tire rubber and the metal rim, which is called breaking the bead.
After the bead is broken all the way around, the technician uses the machine's main arm — a long lever with a curved metal head called a tire iron or demount head. This arm slides under the tire edge and pries it up and off the rim. The wheel spins as the arm works, so the technician only has to move the arm a few times to walk the tire completely off. The old tire is then removed by hand.
How the machine mounts a new tire onto the wheel
Installing the new tire is the reverse process. The technician positions the new tire on the wheel and uses the machine's arm to lever it onto the rim. The arm has a smooth, rounded head designed not to pinch or damage the tire bead. As the wheel spins, the arm walks the tire bead onto the rim edge by edge.
Once the tire is seated on the rim, the machine inflates it. Most Coats changers have a built-in air chuck that connects to the valve stem and fills the tire to a set pressure. The air pressure forces the tire bead to seat fully against the rim edge, creating an airtight seal. The technician can see when the bead has seated because the tire will make a popping sound and the machine's pressure gauge will stabilize.
Different Coats models for different shop sizes
Coats makes several tire changer models, and shops choose based on their volume and the types of vehicles they service. The most common is the single-arm model, which is compact and fits in smaller shops. It handles standard passenger car wheels and light truck wheels efficiently. These machines typically cost between $3,000 and $6,000 new.
Larger shops use two-post or four-post models that can handle heavier wheels and higher volume. Some Coats machines include a built-in wheel balancer, which spins the wheel and measures weight distribution to determine where to add balance weights. A combo machine that changes tires and balances them costs more but saves space and time. Heavy-duty models designed for commercial truck tires are also available, though these are less common in retail tire shops.
What happens during a typical tire change appointment
When you bring your car in for new tires, the shop removes all four wheels and brings them to the tire changer station. The technician mounts the first wheel on the machine, breaks the bead, removes the old tire, and mounts the new one. This takes roughly 10 to 15 minutes per tire. After all four tires are mounted, the wheels go to a wheel balancer (which may be a separate machine or built into the changer), and then they are reinstalled on your vehicle.
The total time for a four-tire replacement is usually 45 minutes to an hour, depending on how busy the shop is and whether the wheels need cleaning or repair. If your wheels are damaged or corroded, the technician may spend extra time cleaning them or may recommend repair or replacement before mounting new tires.
Maintenance and safety considerations
A Coats tire changer requires regular maintenance to work safely and accurately. The machine's chuck (the clamp that holds the wheel) must grip firmly without slipping. The bead breaker and tire iron arms must be smooth and free of dents or sharp edges that could damage a tire. The air system must deliver consistent pressure, and the turntable must spin freely.
Technicians are trained to use these machines safely because they involve pinch points, rotating parts, and pressurized air. A wheel can slip if not clamped correctly, or a hand can be caught if placed in the wrong spot. Shops maintain their equipment regularly and replace worn parts to prevent accidents and may support consistent, quality tire installation.
When you might see a Coats tire changer in action
You will see a Coats tire changer (or a similar brand machine) whenever you visit a tire shop, dealership service department, or independent repair shop for tire installation or replacement. National chains like Discount Tire, Firestone, and Goodyear use Coats equipment. Local independent shops often use Coats as well because the machines are reliable and parts are widely available.
If you watch the work being done, you will notice the technician's efficiency — the machine does the heavy lifting, and the technician guides it. This is faster and safer than mounting tires by hand, and it produces a more consistent result. The machine ensures the tire is seated evenly on the rim, which is critical for balance and safety.
Frequently Asked Questions
Can I buy a Coats tire changer for home use?
Coats makes machines for professional shops, not for home garages. They are large, expensive ($3,000 to $15,000+), require a compressed air system, and need training to operate safely. Home tire changes are done by hand using a tire lever and a jack, which is slower but practical for occasional use.
How long does it take to change four tires on a Coats machine?
Mounting and balancing four tires typically takes 45 minutes to an hour at a shop, depending on how busy they are and whether the wheels need cleaning. The actual machine work is roughly 10 to 15 minutes per tire, but there is also waiting time, wheel removal and reinstallation, and any additional repairs.
What is the difference between a Coats tire changer and other brands?
Coats is the most common brand in North America, but Hunter, Hofmann, and others make similar machines. They all work the same way — breaking the bead, removing the tire, and mounting a new one. Coats is popular because parts are straightforward to find and technicians are familiar with them, but the end result is the same regardless of brand.
Do I need to do anything to prepare my car for a tire change?
No. Just bring your car to the shop with the tires you want replaced. The technician will remove the wheels, use the Coats changer to mount the new tires, balance them, and reinstall them. You do not need to remove the wheels yourself or do any preparation.
What if my wheel is damaged or bent?
A Coats tire changer can still mount a new tire on a bent wheel, but the technician may recommend repair or replacement first. A damaged wheel can cause vibration, poor balance, or tire damage. The shop will let you know if the wheel needs attention before a new tire is installed.