What Is an Exmark Mower Tire Size? (PSI & Fit Chart)
There is no single tire size or PSI that fits every Exmark mower. The correct match depends on the mower’s model and serial number, the wheel position, and the tire and rim specifications. Read the tire sidewall, then confirm the fit and cold pressure in the mower’s manual or Exmark parts information before replacing or inflating a tire.
A tire can look close in size and still rub, bind, or fail to fit the rim. That risk is easy to miss when a manual lists only a part number or when a replacement search shows several similar-looking tires. I teach owners to check the model, wheel position, and pressure as a set, rather than guessing from diameter alone.
Identify the Exmark Model, Tire Position, and Correct Fitment
A correct tire match begins with the mower’s model and serial number, then narrows to the wheel position. Front caster tires and rear drive tires can have different sizes, rims, pressure targets, and tread needs. Use the mower’s manual or Exmark parts information to confirm the exact fit before buying a replacement.
Find the mower’s model and serial number
Look for the identification label on the mower and record both numbers. The serial number can help distinguish production versions, so do not rely on the model name alone. Check the manual or Exmark’s parts lookup for that exact identification.
Also note where the tire sits:
- Front caster: the small wheel assembly that swivels to guide the front of the mower.
- Rear drive wheel: the powered wheel that moves the mower.
Treat these positions separately. A front tire and a rear tire may differ in size, construction, rim, and pressure. Similar outside diameters do not prove that they can be swapped.
Read the tire sidewall
The sidewall is the raised lettering around the tire. It often shows the size, such as 24×12-12. In this example, the numbers mean about 24 inches in nominal outside diameter, 12 inches in nominal section width, and a 12-inch rim diameter.
“Nominal” means the labeled size is a standard description, not a guarantee that every tire measures exactly that size when mounted. The size marking also does not confirm load capacity, rim type, tread, or clearance. Record the full sidewall information and compare it with the model-specific parts details.
Exmark tire fit chart: what to compare
There is no safe universal Exmark tire size chart or PSI value. Use this comparison chart as a fitment checklist, then fill in the specified values from your mower’s manual or parts information.
| Check | Front caster position | Rear drive position |
|---|---|---|
| Mower identity | Confirm model and serial number | Confirm model and serial number |
| Tire size | Match specified size | Match specified size |
| Rim | Match rim diameter and type | Match rim diameter and type |
| Load and construction | Confirm required rating and construction | Confirm required rating and construction |
| Tread and clearance | Check if specified; confirm full caster swivel | Check if specified; confirm clearance from deck and frame |
| Cold pressure | Use the front-position manual or decal value | Use the rear-position manual or decal value |
Before buying, compare the replacement with the original tire and the parts listing. A tire with the right diameter may still have the wrong width, rim, load rating, or construction. If the sidewall marking is unreadable or the manual is missing, contact Exmark or an authorized dealer with the model and serial number.
Set Cold Tire Pressure and Verify Safe Mower Operation
Cold tire pressure is the reading taken before the tires have warmed through use. Set each position to the value listed for that mower in its manual or on its pressure decal. The number on the tire sidewall is a maximum limit, not a recommended operating target for the mower.
Find the correct PSI
Pressure can vary by mower model and wheel position. Check the manual or pressure decal for the front and rear values. Do not copy a PSI number from a different Exmark model or assume all four tires use the same pressure.
Measure with a tire-pressure gauge when the tires are cold. If you have just mowed, let the tires cool before checking. Adding or releasing air based on a warm reading can leave the cold pressure incorrect.
| What you see | What it means | What to do |
|---|---|---|
| Manual or decal lists a pressure | This is the mower’s target for the stated position | Measure cold and set to that value |
| Sidewall lists a maximum pressure | This is a limit for the tire, not the mower’s target | Do not use it in place of the manual value |
| No readable tire marking or pressure value | Fitment or target pressure is not confirmed | Check model and serial number with Exmark or a dealer |
| Tire rubs, bulges, leaks, or loses air | The fit or tire condition may be unsafe | Stop use and correct the problem before mowing |
Install and check a replacement
Use the correct tire and rim assembly, and follow the mounting procedure for that wheel. If the wheel must come off the mower, support the mower securely; do not rely on a jack alone. A mismatched rim or poorly seated bead can lead to sudden pressure loss.
After installation:
- Park on level ground, disengage the blades, set the brake, shut off the engine, remove the key, and let hot parts cool.
- Set the cold pressure to the manual’s value for that wheel position.
- Check the tire for leaks and confirm the bead is seated evenly on the rim.
- Lower the mower and check that the front caster swivels freely through its travel.
- Check that the tires do not touch the deck or frame.
- Test slowly on level ground. Stop if the mower pulls abnormally, a tire rubs, or pressure drops.
Do not try to fix a fit problem by using more pressure than the manual specifies. Excess pressure can reduce traction and make the ride harsh or unstable. Rubbing, binding, a damaged sidewall, a loose bead, or a leak calls for a fit or repair check, not continued mowing.
Real-World Fitment Scenarios
These scenarios show how to apply the fit checks without assuming that one tire size or pressure works across Exmark models. They are examples of the decision process, not model-specific fit recommendations. Use your mower’s own manual, decal, and parts information for the final answer.
A matching size marking, but an unverified fit
Suppose the old tire reads 24×12-12 and a replacement has the same marking. That is a useful starting point, but it does not confirm that the replacement has the correct construction, load rating, tread, or rim compatibility. Check the model-specific parts information and compare the wheel position before ordering.
A front tire rubs after replacement
If a new caster tire rubs as it turns, stop using the mower. Check that it is the correct front tire and rim, then inspect clearance through the full caster swivel. A similar-looking tire may be too wide or otherwise incompatible. Do not keep mowing or raise pressure to try to stop the rubbing.
The sidewall shows a higher PSI than the manual
If the tire’s sidewall maximum is higher than the mower’s specified pressure, follow the mower’s manual or decal. The sidewall number marks a limit for the tire. It does not replace the mower maker’s target for that wheel position.
Inspect Tires, Wheels, and Pressure During Maintenance
A quick tire check helps catch pressure loss, damage, and rubbing before they affect mowing. Inspect each wheel position rather than treating the tires as a matched set. Use the manual’s pressure targets and watch for changes from one check to the next.
Before mowing, look for cuts, bulges, cracks, embedded objects, or a tire that appears low. Check the tread and sidewall, and look for signs that a tire has been rubbing the deck or frame. If a tire loses pressure repeatedly, find the cause rather than topping it up and carrying on.
During a pressure check:
- Use a gauge and measure cold.
- Compare each reading with the correct front or rear value.
- Check the valve and rim area for signs of a leak.
- Stop if the tire is damaged, the bead is loose, or the wheel fit is uncertain.
Keep a note of the pressure values and the date of each check. A change from the usual reading can help you spot a slow leak. If the mower tracks poorly after a tire change, inspect fitment and pressure first; do not assume the issue will correct itself.
Store Tires Correctly and Recheck Pressure Seasonally
Storage does not change the tire size needed for your Exmark mower, but pressure and condition still deserve attention. Before the next mowing season, inspect each tire and confirm cold pressure against the manual. Recheck after storage, especially if a tire looks low or the mower has been moved.
Park the mower in a stable place and follow the storage instructions in its manual. Before use, look for new cracks, bulges, damage, or evidence of air loss. Confirm that the wheels still clear the deck and frame and that the front casters swivel freely.
If a tire has gone flat or the wheel was removed during storage, verify the tire, rim, and pressure again before mowing. A tire that holds air is not automatically the correct fit. Model-specific fitment remains the key check.
Frequently Asked Questions
These short answers cover the most common Exmark tire-size and PSI questions. The main rule is to confirm size and pressure by mower model, serial number, and wheel position. If the manual, decal, or tire marking does not give a clear answer, check with Exmark or an authorized dealer before operating.
What size tires does an Exmark mower use?
It depends on the model and wheel position. Read the tire sidewall, then confirm the size in the manual or Exmark parts information for your mower’s model and serial number.
Is there one tire size that fits all Exmark mowers?
No. Exmark mower tire sizes vary by model and by front caster or rear drive position. Do not choose a tire based only on a size listed for another mower.
What does 24×12-12 mean on a mower tire?
It means about 24 inches in nominal outside diameter, 12 inches in nominal width, and a 12-inch rim diameter. It does not, by itself, confirm that the tire fits your mower.
What PSI should I use in Exmark mower tires?
Use the cold pressure listed in the operator’s manual or on the mower’s pressure decal for each wheel position. There is no universal Exmark tire PSI.
Should I inflate the tire to the PSI on its sidewall?
Not unless that value also matches the mower’s specified target. The tire sidewall number is a maximum pressure limit, not the mower’s recommended operating pressure.
Can I use a front caster tire on the rear?
Do not assume so. Front and rear tires may differ in size, construction, rim, pressure, and tread. Confirm the replacement for the exact wheel position.
Can I replace a tire with one that has the same diameter?
Not based on diameter alone. Check width, rim diameter and type, load capacity, construction, tread where specified, and clearance.
What if I cannot read the tire sidewall?
Record the mower’s model and serial number and contact Exmark or an authorized dealer. Do not guess from the tire’s appearance.
What should I do if a new tire rubs?
Stop operating the mower. Confirm the tire and rim match the specified position, then check clearance through full caster swivel and around the deck and frame.
When should I check mower tire pressure?
Check it with a gauge when the tires are cold, before mowing or after they have cooled. Follow the manual’s schedule and recheck after storage or suspected air loss.
Bottom Line
The right Exmark tire size and PSI come from the mower’s exact model and serial number, the wheel position, and the tire and rim specifications. Match the replacement using model-specific information, set pressure cold to the manual’s target, and stop if a tire leaks, rubs, or binds.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
