Overview
The Michelin Primacy MXM4 ZP is a premium run-flat summer touring tire designed for drivers of sedans, coupes, and some compact crossovers who demand a blend of confident dry and wet weather performance with the added peace of mind that run-flat technology provides. Tailored for those who value safety, comfort, and the convenience of not being stranded by a puncture, the MXM4 ZP is a popular original equipment (OE) fitment on luxury models from BMW and Mercedes-Benz. Its balanced design favors everyday usability, precise handling, and a quiet, refined ride, making it ideal for daily driving, highway commuting, and long-distance touring in warm climates.
Key Specs
| Type | Summer Touring Run-Flat |
| Available sizes range | 16″ to 19″ (e.g., 225/50 R17, 245/45 R18) |
| Speed rating examples | V (149 mph), W (168 mph) |
| Load index examples | 91 (1356 lbs), 96 (1565 lbs) |
| Tread pattern | Asymmetric, continuous center rib with optimized sipes |
| Technology highlights | Michelin Zero Pressure (ZP) run-flat, MaxTouch Construction, sunflower oil-infused tread for flexibility |
Performance: Dry
The Primacy MXM4 ZP delivers well-balanced dry performance that matches the expectations of premium touring tires. Steering response is precise, aided by the tire’s stiff sidewalls and well-tuned tread pattern. While outright grip levels don’t match those of dedicated performance summer tires, the MXM4 ZP provides stable cornering and reassuring feedback for brisk daily driving or highway cruising. Braking distances are competitive within the run-flat segment, and the tire maintains its composure during emergency maneuvers. Enthusiasts may notice a slightly firmer feel on turn-in due to the run-flat construction, but for most drivers, this translates into added confidence and predictability.
Performance: Wet
In wet conditions, the Primacy MXM4 ZP stands out for its secure, predictable handling. Wide circumferential grooves and directional sipes efficiently channel water away, reducing the risk of hydroplaning even at highway speeds. Stopping power in the rain is strong for a run-flat, with the rubber compound maintaining grip as temperatures fluctuate. While ultimate wet lateral grip is a step below the very best non-run-flat summer tires, the MXM4 ZP offers enough traction for safe, assured driving in heavy downpours and damp conditions. Its wet weather performance is particularly notable for drivers who regularly face sudden summer storms or early morning showers.
Performance: Snow & Ice
N/A — The Michelin Primacy MXM4 ZP is a summer touring tire and is not designed for use in snow or on ice. Drivers in regions with frequent winter conditions should consider dedicated winter or all-season run-flat alternatives.
Comfort & Noise
One of the strongest suits of the Primacy MXM4 ZP is its overall refinement. Despite the inherently stiffer sidewalls required for run-flat capability, Michelin’s use of MaxTouch Construction and noise-optimized tread design keeps road noise to a minimum. Passengers will appreciate the tire’s ability to absorb small bumps and surface irregularities, delivering a composed, quiet ride on highways and city streets alike. At lower speeds, some harshness may be noticeable over potholes or sharp expansion joints, a common trait among run-flats, but overall comfort levels remain above average for the segment.
Durability & Economy
Michelin is known for longevity, and the Primacy MXM4 ZP follows suit. Treadwear is competitive—the tire resists irregular wear thanks to its even pressure distribution and robust construction. The UTQG (Uniform Tire Quality Grading) typically ranges from 500 to 540 A A for common sizes, indicating strong wear and traction characteristics for a summer tire. Rolling resistance is slightly higher than non-run-flat counterparts due to reinforced sidewalls, but the difference is modest; most drivers will see little impact on fuel economy, especially compared to older run-flat generations. For fleet operators or high-mileage commuters, this tire provides a good blend of durability and security, though it’s not the outright leader in tread life among all touring options.
Sizes & Alternatives
The Primacy MXM4 ZP is available in a variety of popular OE and replacement sizes:
- 225/50 R17 94V
- 245/45 R18 96W
- 245/40 R19 94W
Common OE fitments include various BMW 3 Series, 5 Series, and Mercedes-Benz E-Class models.
Key alternatives in the US market include:
- Bridgestone Turanza EL400 RFT
- Pirelli Cinturato P7 Run Flat
- Continental ProContact GX SSR
- Goodyear Eagle LS-2 ROF
- Bridgestone DriveGuard (for non-OE, broader fitment)
Pros & Cons
Pros
- Excellent dry and wet handling for a run-flat
- Refined ride comfort and low road noise
- Run-flat technology allows continued driving after a puncture
- Good treadwear and even wear characteristics
- Wide OE fitment for premium sedans and coupes
Cons
- Not suitable for snow or ice (summer-only)
- Ride is firmer over sharp impacts compared to non-run-flats
- Rolling resistance slightly higher than standard tires
- Higher price point compared to non-run-flat touring tires
- Limited availability in some non-OE sizes
Verdict
The Michelin Primacy MXM4 ZP brings together summer touring refinement with the vital safety net of run-flat technology, making it a top choice for those who prioritize peace of mind without sacrificing daily comfort or driving enjoyment. Its dry and wet performance is more than adequate for spirited commuting and long-distance travel, while noise and ride comfort remain class-leading for a run-flat. The premium price is justified by Michelin’s reputation for quality, consistent performance, and strong treadwear. However, its summer-only design means it’s not a fit for regions with significant winter weather, and those seeking the absolute softest ride may prefer non-run-flat alternatives. For owners of luxury sedans and coupes who want OE-matched replacement rubber that delivers both safety and refinement, the Primacy MXM4 ZP is a compelling option worth considering.
Since the MXM4 ZP is a run-flat, does it compromise noticeably on ride comfort compared to non-run-flat Michelin summer touring options?
The MXM4 ZP, being a run-flat tire, does have a slightly firmer ride compared to non-run-flat Michelin summer touring tires. This is due to reinforced sidewalls necessary for run-flat technology. While most drivers notice a modest decrease in comfort, it’s generally well balanced by the added safety and convenience of run-flat capability.
Does the Michelin Primacy MXM4 ZP work well for long-distance summer road trips in really hot southern states, or would extreme heat impact its performance or tread life?
The Michelin Primacy MXM4 ZP is designed to handle summer conditions and provides good comfort and reliability for long-distance driving, even in hot southern states. However, like most tires, extreme heat can accelerate tread wear over time. Regularly checking tire pressure and rotating the tires can help maintain performance and extend tread life during hot weather road trips.
Are there any notable differences in the performance or longevity of the MXM4 ZP between its use as original equipment and when fitted as a replacement tire?
The Michelin Primacy MXM4 ZP generally offers similar performance and longevity whether used as original equipment or as a replacement tire. However, vehicle tuning and alignment from the factory may slightly affect how the tire wears as original equipment. When used as a replacement, ensuring proper installation and alignment will help you achieve the expected performance and lifespan.
The article mentions load index numbers like 91 and 96. How do I know which one is the right fit for my car, and what happens if I get it wrong?
The load index number tells you how much weight each tire can safely support. You can find the correct load index for your car in your owner’s manual or on the placard inside the driver’s door. Using a tire with too low a load index can be unsafe, as it may not handle your vehicle’s weight properly.
Are there any notable differences in wet weather braking distances between the V and W speed rated versions of the Primacy MXM4 ZP?
Both the V and W speed rated versions of the Primacy MXM4 ZP perform well in wet conditions, but there can be slight differences. Typically, W-rated tires may have a marginally shorter wet braking distance due to their rubber compound and tread design optimized for higher speeds. However, these differences are usually minor and may not be noticeable in everyday driving.