A Coats tire changer is a machine that removes and installs tires on your wheels
A Coats tire changing machine is an automated device that grips your wheel, breaks the bead (the seal between tire and rim), strips the old tire off, and mounts a new one. The machine does the heavy physical work that would otherwise require a technician to use hand tools and leverage. Coats is one brand; other manufacturers like Hunter and Hofmann make similar machines, but Coats machines are common in independent shops and chain tire retailers.
You do not operate this machine yourself. A tire technician uses it during a tire replacement or repair visit. The machine speeds up the job and reduces the risk of damage to your wheel or tire bead. If you are having tires changed at a shop, there is a good chance a Coats machine (or something functionally identical) is doing the work.
The main reason shops invest in these machines is time and consistency. A technician can change four tires in roughly 30 to 45 minutes with a machine, versus 60 to 90 minutes by hand. The machine also applies even pressure, which matters for wheels with delicate finishes or unusual shapes.
Key Takeaways
- A Coats tire changer is operated by the shop technician, not by you, and removes and installs tires automatically.
- The machine breaks the bead, strips the old tire, and mounts the new one faster and more consistently than hand tools alone.
- Shops use these machines to reduce labor time and protect expensive or specialty wheels from damage.
- You should expect tire changes to take 30 to 45 minutes per vehicle when a machine is used, versus longer if done by hand.
How the machine works step by step
The technician places your wheel on the machine's spindle and secures it. The machine then rotates the wheel while a tool called a bead breaker applies pressure around the tire's edge to separate it from the rim. This is the hardest part of tire removal when done by hand, so automating it saves time and reduces strain.
Once the bead is broken, the machine's arm positions a metal blade under the tire sidewall and rotates the wheel, peeling the tire off the rim. The old tire is then removed by hand. The technician then positions the new tire on the machine, and the arm guides it onto the rim as the wheel rotates. The machine applies a lubricant (usually a soap solution) to help the tire slide into place without pinching or tearing the bead.
After the new tire is seated, the technician removes the wheel and balances it separately (usually on a different machine). The whole process is mechanical and repeatable, which is why results are consistent from one tire to the next.
Why shops choose Coats machines over other brands
Coats machines are popular because they are durable, widely available, and parts are straightforward to find. They also tend to have a smaller footprint than some competitors, which matters in shops with limited floor space. A Coats machine typically costs between $3,000 and $8,000 depending on the model and features, so shops that buy them expect them to run for years.
Other brands like Hunter and Hofmann offer similar functionality. The choice often comes down to what the shop owner is familiar with, what their suppliers stock, and whether they need specialized features like a help arm for heavy wheels or a touchscreen control panel. From your perspective as a customer, the brand of the machine matters far less than whether the technician knows how to use it correctly.
What can go wrong and how to spot it
The most common issue is improper bead seating, which happens when the tire does not seat evenly on the rim. This usually shows up as a vibration or pulling to one side after you drive away. A properly seated tire should have a visible line (the bead line) running around the sidewall where it meets the rim. If that line is uneven or missing in spots, the tire was not seated correctly.
Another problem is damage to the wheel finish. If the machine's arm or blade is not positioned correctly, it can scratch or gouge a painted or polished rim. This is rare with modern machines and trained technicians, but it happens. Before you leave the shop, inspect your wheels under good light. If you see fresh scratches or gouges that were not there before, point them out when ready.
Tire bead damage is also possible if the machine is used too aggressively or if the tire is old and brittle. You will notice this as a leak that develops within a few days of the tire change. If this happens, contact the shop—many will cover the cost of a replacement tire if their machine caused the damage.
When a shop might do tire changes by hand instead
Some shops do not have a Coats machine or choose not to use it for certain jobs. This is usually because the wheel is specialty or delicate—think thin-spoked alloy wheels, vintage rims, or wheels with a special coating. Hand tools give the technician more control and reduce the risk of the machine's arm slipping and damaging the finish.
Very large or very small wheels sometimes cannot fit on the machine's spindle, so those are done by hand as well. If you have non-standard wheels, ask the shop ahead of time whether they can use their machine or whether they will do the work by hand. Hand work takes longer and may cost more, but it is the safer choice for expensive wheels.
What to expect during your tire change appointment
When you drop off your vehicle for a tire change, the shop will pull it into a bay and lift it on a hoist. The technician will remove all four wheels (or however many you are replacing) and carry them to the Coats machine. The actual machine work—breaking the bead, removing the old tire, and mounting the new one—takes roughly 8 to 12 minutes per wheel.
After the tires are mounted, the wheels go to a separate balancing machine, which takes another 5 to 10 minutes per wheel. The technician then reinstalls the wheels on your vehicle, torques the lug nuts to the correct specification, and lowers the car. Total time is usually 30 to 45 minutes for four tires, though this varies based on how busy the shop is and whether any complications arise.
If you are replacing only two tires, the job is faster—usually 20 to 30 minutes. Some shops will rotate your existing tires at the same time, which adds a few minutes but can extend the life of all four tires.
Frequently Asked Questions
Can a Coats machine damage my wheels?
It can if the machine is not used correctly or if your wheels are delicate. Modern machines have safety features to prevent this, and trained technicians know how to position the arm to avoid contact with the wheel face. If you have expensive or specialty wheels, tell the shop before they start, and ask whether they recommend using the machine or doing the work by hand.
Is a tire change faster with a machine than by hand?
Yes. A Coats machine typically cuts the time per tire in half, from 15 to 20 minutes by hand down to 8 to 12 minutes with the machine. This is why most shops use them—the speed adds up across dozens of tire changes per day.
Do I need to do anything special to prepare for a tire change?
No. Just drive to the shop and let the technician handle it. Make sure your vehicle is clean enough that the technician can see the lug nuts and wheel condition, but a normal car wash is fine. If you have wheel locks or specialty lug nuts, mention that when you book the appointment.
What if the tire does not seat properly after the machine mounts it?
The technician should catch this before you leave. They will remount the tire and try again, or use hand tools to adjust the bead. If you notice a vibration or pulling after you drive away, return to the shop when ready. A properly seated tire should not vibrate or pull.
Is a Coats machine the only brand shops use?
No. Hunter, Hofmann, and other brands make similar machines. Coats is common, but the specific brand matters less than whether the technician is trained to use it correctly. All modern tire changing machines work on the same basic principle: break the bead, strip the tire, mount the new one.