Mercedes-Benz Tire Guide: Factory Sizes, MO/MOE, Staggered Fitment & 4MATIC
Factory sizes from Mercedes-Benz USA, MO/MOE explained, staggered fitment, 4MATIC front and rear sizes, run-flat trade-offs and plus sizing.
If you own a Mercedes-Benz and need to buy new tires, it is not as simple as typing your car into a tire website and picking the cheapest option. Between MO and MOE markings, staggered fitments on AMG models, run-flat requirements, TPMS sensors, and model-specific sizing quirks, there is a lot to get wrong.
This guide covers the parts we could source from Mercedes-Benz: factory sizes from Mercedes-Benz USA, the MO/MOE/MO1/MOS markings, staggered fitment, 4MATIC front and rear sizes, run-flat trade-offs and plus sizing.
What Do MO and MOE Mean on a Mercedes Tire?
MO stands for Mercedes Original. Mercedes-Benz says these tires are developed, tested and adapted to individual models, matching the suspension and driving safety systems.
MOE stands for Mercedes Original Extended: reinforced sidewalls that let you keep driving after a loss of tire pressure. Mercedes-Benz states MOE tires must be used with a tire pressure monitoring system. MO1 tires are made specifically for AMG, and MOS tires carry a foam insert for lower noise on select S-Class cars.
Does It Actually Matter?
If your Mercedes came with MOE tires and no spare wheel, stay with run-flat tires unless you deliberately switch and have another way to deal with a puncture. For MO tires, the approval means the tire was tested on your model.
Can You Fit Non-MO Tires?
Unmarked tires of the right size, load index and speed rating are sold, but they have not been approved by Mercedes-Benz for your model. Ask a Mercedes-Benz dealer, and keep run-flat capability on cars without a spare.
Factory Tire Sizes Listed by Mercedes-Benz USA
Standard wheel and tire for the model year shown, from the Mercedes-Benz USA model pages. Only models whose page listed a tire size are included. Diameters are calculated. Other trims, option wheels and other markets use other sizes, so check the placard on your car.
| Model | Year | Front | Rear | Front OD | Rear OD | Notes |
|---|---|---|---|---|---|---|
| C 300 4MATIC Sedan | 2026 | 225/45R18 | 245/40R18 | 25.97" | 25.72" | Staggered, 0.96% apart |
| E 350 Sedan | 2027 | 225/55R18 | 225/55R18 | 27.74" | 27.74" | Same size both axles |
| S 500 4MATIC Sedan | 2027 | 255/45R19 | 255/45R19 | 28.04" | 28.04" | Same size both axles |
| GLA 250 4MATIC SUV | 2026 | 235/55R18 | 235/55R18 | 28.18" | 28.18" | Same size both axles |
| GLB 250 SUV | 2026 | 235/55R18 | 235/55R18 | 28.18" | 28.18" | Same size both axles |
| GLC 300 4MATIC SUV | 2027 | 235/55R19 | 235/55R19 | 29.18" | 29.18" | 2026 model lists 235/60R18 |
| GLC 300 4MATIC Coupe | 2027 | 235/55R19 | 255/50R19 | 29.18" | 29.04" | Staggered, 0.48% apart |
| EQS 450+ Sedan | 2027 | 255/45R20 | 255/45R20 | 29.04" | 29.04" | Electric, range-optimized summer tire |
Staggered Fitment on Mercedes-Benz: What You Need to Know
A staggered fitment means the front and rear tires are different sizes, usually with a wider rear. On the Mercedes-Benz USA pages we checked, the 2026 C 300 4MATIC Sedan (225/45R18 front, 245/40R18 rear) and the 2027 GLC 300 4MATIC Coupe (235/55R19 front, 255/50R19 rear) are staggered.
The Rotation Problem
On a staggered fitment the front and rear tires are different sizes, so they cannot be swapped between axles during rotation. Each axle wears on its own schedule, so check front and rear tread depth separately at every service.
4MATIC and Diameter Tolerance
Mercedes-Benz owner manuals ask 4MATIC owners to use tires of the same type and make, and the same size on each axle. No percentage is published. Mercedes' own front and rear pairs differ by 0.48% (GLC 300 Coupe) and 0.96% (C 300 4MATIC), calculated. For the percentage on any AWD car, see the tire size difference calculator, and the AWD tire size mismatch guide collects what other makers say. Check any change with the Mercedes Tire Size Calculator before ordering.
Can You Switch to a Square Fitment?
Switching a staggered car to a square fitment changes the handling balance the car was set up with. On a 4MATIC model, confirm the rolling-diameter match first and ask a Mercedes-Benz dealer whether the new size is approved for your car.
Where to Find the Correct Tire Pressure for Your Mercedes-Benz
Mercedes-Benz prints the required cold pressures on a label on the door pillar or inside the fuel filler flap. They vary by model, tire size and load, so no general chart can replace the label on your car.
Three rules that matter more than any table
- Use your car's label first: it reflects your exact model, wheel size, and load.
- Measure cold: driving warms the tire and raises pressure, so checking warm gives a false reading.
- Adjust for load: the label may list separate figures for a light and a fully loaded car.
Unit conversion: PSI × 6.895 = kPa, and kPa × 0.14504 = PSI. Our kPa to PSI converter does it for you.
TPMS: Mercedes-Benz cars use a tire pressure monitoring system. After changing tires or pressures, follow your owner manual to restart or register it, or ask a Mercedes-Benz dealer or tire shop.
Run-Flat vs Conventional Tires on a Mercedes: The Full Trade-Off
Some Mercedes-Benz models leave the factory without a spare wheel and use MOE Extended Mobility tires instead. After a loss of tire pressure you can keep driving a limited distance at reduced speed. The exact limits for your car are in your owner manual.
Run-Flat Downsides
- Ride comfort: A reinforced sidewall is stiffer than a standard one, which can change ride feel.
- Cost: Run-flat tires are often priced higher than equivalent conventional tires, so compare quotes.
- Repairability: Ask the tire maker or a Mercedes-Benz dealer whether a tire driven while flat can be repaired.
- Availability: Specific run-flat sizes can be harder to source in some regions.
Switching to Conventional Tires
- Confirm the boot has no spare wheel well.
- Get a puncture backup plan: repair kit plus roadside assist subscription is the most practical.
- Choose a tire in the right size, load index and speed rating, and ask whether it is approved for your model.
- Follow your owner manual for TPMS registration after the change.
- Check pressures more regularly without run-flat capability.
Plus Sizing on a Mercedes: What Works and What to Watch
Plus sizing means fitting a larger wheel diameter while reducing the tire sidewall to keep overall diameter close to stock. Continental advises keeping rolling circumference within 3% of the original. Mercedes-Benz does not publish a general percentage, so confirm approved sizes for your car with a dealer.
Why owners plus-size
- Improved steering response and lateral stiffness
- Better cornering feel on performance models
- More aggressive visual stance
- Wider aftermarket tire choice at common sizes
Trade-offs to expect
- Harsher ride on rough surfaces
- Greater pothole and kerb damage risk
- Larger wheels need extra clearance and may not suit your model
| Original Size | Original OD | Plus-One Size | New OD | Difference |
|---|---|---|---|---|
| 225/45R18 | 25.97" | 225/40R19 | 26.09" | +0.44% |
| 225/55R18 | 27.74" | 245/45R19 | 27.68" | -0.23% |
| 235/55R18 | 28.18" | 235/50R19 | 28.25" | +0.27% |
| 235/55R19 | 29.18" | 235/50R20 | 29.25" | +0.26% |
TPMS on Mercedes-Benz: Winter Wheels and Sensor Registration
Mercedes-Benz cars use a tire pressure monitoring system, and Mercedes-Benz states MOE tires must be used with it. When you fit wheels the car has not seen before, the system may need to be restarted or the sensors registered, and the steps depend on your model.
Registering new sensors
Inflate to the pressure on your car's label, then follow the TPMS steps in your owner manual. If the warning stays on, a Mercedes-Benz dealer or tire shop can register the sensors.
Winter wheel buying checklist
- Confirm bolt pattern, centre bore and offset for your exact model with a Mercedes-Benz dealer
- Hub-centric rings included if the wheel centre bore is larger than the hub
- Compatible TPMS sensors included and registration booked
- Winter tire size keeps overall diameter close to the summer size
Load Index, Speed Rating & XL Tires
Speed Rating
| Rating | Max Speed | Typical Use |
|---|---|---|
| H | 210 km/h | Standard code |
| V | 240 km/h | Standard code |
| W | 270 km/h | Standard code |
| Y | 300 km/h | Standard code |
Do not fit a tire with a lower speed rating than the one in your owner manual or on the tire placard. Other letters are in the speed rating chart.
Load Index Reference
| Index | Max Load / Tire |
|---|---|
| 91 | 615 kg |
| 94 | 670 kg |
| 97 | 730 kg |
| 100 | 800 kg |
| 103 | 875 kg |
| 107 | 975 kg |
| 111 | 1,090 kg |
When to Replace Mercedes-Benz Tires: Age, Tread & Wear Signs
Reading the DOT Date Code
The last four digits of the DOT code are the week and year of manufacture. Example: 2423 = week 24 of 2023 = June 2023. The tire age and DOT code decoder does the reading for you.
Tire makers publish their own age guidance, so check your tire maker and your Mercedes-Benz owner manual for when to replace an older tire, whatever the tread depth.
Tread Depth Thresholds
- EU legal minimum: 1.6 mm
- Wear bars: the tread wear bars sit at 1.6 mm
Wet grip falls as tread wears, so many drivers replace before the legal limit. Check your tire maker's advice.
Replace immediately if you see:
- Sidewall cracks or crazing
- Bulges or blisters on the sidewall
- Cuts or punctures in the sidewall (never repairable)
- Uneven wear across the tread width
- Tread wear bars visible (1.6 mm reached)
- Vibration or pulling with no suspension change
Mercedes-Benz Tire FAQ
For quick size comparison, speedometer error, and diameter checks before ordering, use the Mercedes Tire Size Calculator.
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