Commercial Truck Steer Tires
MP991 is built for steer axle positions where handling, stability, front-axle load support, and even wear matter most.
Designed for long-haul and regional highway applications, the MP991 combines a five-rib tread pattern, wide footprint, and siping to support straight-line tracking, wet-road control, ride comfort, and predictable wear.
Five-Rib Commercial Truck Steer Tire
The Muscle Power MP991 is a commercial truck tire designed for long-haul and regional highway service. Its five-rib tread pattern is built to help support straight-line stability, even wear, ride comfort, and dependable handling on paved road applications.
The MP991 uses a wide footprint to promote stable road contact and steering control, while its siping and tread design help support traction, heat dispersion, and resistance to irregular wear. For fleets that need a strong steer tire value without premium-brand pricing, MP991 offers a practical balance of commercial-duty construction, highway performance, and aggressive cost-per-mile positioning.
MP991 is designed for front axle positions in long-haul and regional highway applications where stable handling, even wear, wet-road control, and front axle load support are important.
MP991 Front View
MP991 Angle View
MP991 Tread ViewThe five-rib pattern helps the tire maintain straight-line tracking, ride comfort, and stable highway performance. Rib-style tread designs are commonly used for paved road applications where even wear and handling are important.
A wider contact area helps support stability, steering response, and consistent road contact. This is especially important in front tire positions where the tire helps guide the vehicle.
Siping helps create additional edges for wet-road grip while also helping manage heat across the tread surface during highway and regional use.
The MP991 tread design is built to help resist irregular wear when the tire is properly inflated, aligned, balanced, and matched to the correct application.
Front tires carry a concentrated share of the truck's front axle weight. MP991 sizes include Load Range G and Load Range H options, depending on tire size and application.
MP991 is positioned for fleets and dealers that need dependable commercial truck tire performance with strong value compared with higher-priced premium brands.
Use the MP991 specification table to match the correct tire size, load range, load index, rim width, inflation pressure, and overall diameter to the truck's front axle requirements. For front axle applications, load index and inflation pressure are especially important because only two tires normally carry the front axle load.
| Size | Ply Rating | Load Range | Load Index | Speed Symbol | Outside Diameter | Section Width | Tread Depth 32nds | Rim | Single Max Load/Pressure | Dual Max Load/Pressure | Static Load Radius | Revs Per Mile | Weight lbs | Tire Type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 11R22.5 | 16 | H | 146/143 | L | 41.22 | 11 | 18 | 8.25 | 6610/120psi | 6005/120psi | 20.1 | 486 | 111.6 | TL |
| 11R24.5 | 16 | H | 149/146 | L | 41.43 | 11 | 18 | 8.25 | 7160/120psi | 6610/120psi | 21.1 | 466 | 119.6 | TL |
| 295/75R22.5 | 14 | G | 144/141 | L | 39.92 | 11.7 | 18 | 9 | 6175/110psi | 5675/110psi | 19.4 | 498 | 107 | TL |
| 285/75R24.5 | 14 | G | 144/141 | L | 41.2 | 11.1 | 18 | 8.25 | 6175/110psi | 5675/110psi | 19.8 | 485 | 112.2 | TL |
Steer Tire Priorities
| Priority | Why It Matters | What to Look For |
|---|---|---|
| Steering Control | Front tires guide the truck and affect driver confidence. | Stable rib pattern, consistent footprint, correct inflation. |
| Even Wear | Irregular front tire wear can shorten tire life quickly. | Alignment, balance, casing stability, proper pressure. |
| Load Capacity | The front axle usually uses only two tires. | Correct load index, load range, rim, and inflation pressure. |
| Wet-Road Handling | Front tires help maintain control in rain and highway spray. | Siping, groove design, tread contact stability. |
| Ride Comfort | Front tires affect vibration, tracking, and road feel. | Rib design, uniform construction, correct mounting. |
| Value Per Mile | The front tire position needs predictable wear and dependable performance. | Tread design, casing strength, maintenance program. |
Get manufacturer-direct access to Muscle Power commercial truck tire programs.
Buying for a single truck? Use Buy Online when available or contact a local Muscle Power dealer.
Steer Tire Education
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Control, stability, even wear, wet-road handling, and front axle load support.
Traction, torque, pulling power, tread bite, and loaded miles.
A steer tire is built for control, stability, handling, and front axle load support. Unlike a drive tire, it is not primarily designed to transfer engine torque to the road. Its job is to help guide the truck, support braking control, maintain straight-line stability, and respond predictably to driver input.
Drive tires usually focus on traction, torque, tread bite, and pulling power. Front axle tires focus more on rib stability, even wear, wet-road handling, shoulder durability, and driver confidence. This is why many front-position tires use rib-style tread designs instead of aggressive block-style traction patterns.
The MP991 is designed around these steer-position priorities. Its five-rib tread pattern, siping, and wide footprint help support stable handling, ride comfort, wet-road traction, and resistance to irregular wear in highway and regional applications.
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The front axle load is normally carried by one tire on each side.
The first load index number is most relevant for front axle positions.
Match the tire to axle rating, actual load, rim width, and inflation pressure.
Load index is especially important because the front axle normally uses only two tires. On a tandem drive or trailer axle group, the load may be distributed across eight tires. Up front, each tire carries a much larger share of the axle weight.
That means tire selection should not be based on ply rating alone. The correct tire must match the truck's front axle rating, actual load, rim width, inflation pressure, and application. A higher load index can matter more on front positions than on many dual-tire drive or trailer positions because there are fewer tires carrying the axle load.
For example, a tire marked 146/143 uses the first load index number for single-tire use and the second for dual-tire use. On front axle positions, the single-tire load index is the more relevant number because each tire is mounted as a single tire, not a dual pair.
For MP991, the listed Load Range H sizes include 11R22.5 146/143L and 11R24.5 149/146L, while the Load Range G sizes include 295/75R22.5 144/141L and 285/75R24.5 144/141L. The right choice depends on the truck, axle load, wheel size, inflation pressure, and application requirements.
For front axle use, do not only ask "14-ply or 16-ply?" Ask: what is the load index, what is the actual front axle load, and what inflation pressure is required?
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Front tires often show mechanical and maintenance problems earlier than other tire positions. Because they guide the truck and respond to steering forces, they are sensitive to alignment, inflation pressure, wheel balance, suspension condition, and driver operating conditions.
A quality commercial truck tire can support even wear, but no tire can overcome poor alignment, wrong pressure, or mechanical issues. To protect front tire value, fleets should check inflation pressure regularly, inspect for shoulder wear or cupping, keep front-end alignment within spec, and rotate or remove tires based on fleet maintenance policy.
For dealers and fleets, MP991 should be positioned as a front axle tire designed to support stable wear and handling when used in the correct application and maintained properly.
Commercial truck tire specifications help match the tire to the correct front axle, wheel, load, and route. The most important specs include tire size, ply rating, load range, load index, speed symbol, overall diameter, section width, tread depth, rim width, maximum load, inflation pressure, revolutions per mile, and tire weight.
Identifies the tire fitment, such as 11R22.5, 11R24.5, 295/75R22.5, or 285/75R24.5.
Shows the tire's load/strength category. Load Range G is commonly associated with 14-ply rating, while Load Range H is commonly associated with 16-ply rating.
Shows the rated load capacity. For front axle use, the single-tire load index is especially important because the axle normally uses one tire on each side.
Speed Symbol L means the tire is rated up to 75 mph when properly loaded, inflated, installed, and used within service conditions. Legal speed limits, load weight, heat, road conditions, and tire pressure still matter.
MP991 uses an 18/32 original tread depth, supporting highway control without using an overly aggressive drive-style tread design.
Shows the maximum rated load at the required inflation pressure. The tire must be properly inflated to carry its rated load.
Steer Tire Spec Reminder: For front axle use, the correct tire is not simply the one with the highest ply rating. The correct tire is the one that matches the axle load, rim, inflation pressure, vehicle requirements, and application.
Tire Position Guide
Compare Muscle Power tire options by axle position: Drive Tires for traction and torque, Trailer Tires for scrub resistance, All Position Tires for versatile fleet use, and Intermodal Tires for container, chassis, and drayage work.
Steer Tire FAQ
The MP991 is the Muscle Power commercial truck tire designed for steer axle applications. It is built for long-haul and regional highway use where front-end stability, straight-line tracking, even wear, wet-road control, and front axle load support are important. MP991 is available in common commercial truck sizes including 11R22.5, 11R24.5, 295/75R22.5, and 285/75R24.5.
MP991 uses a five-rib tread pattern, wide footprint, and siping to support stable handling, predictable road contact, wet-road performance, and resistance to irregular wear. For highway and regional fleets, those features help create a steer-position tire focused on control, driver confidence, and consistent first-life performance.
Yes. On a front axle, each tire is mounted as a single tire and carries a larger share of the axle load. That makes load index, inflation pressure, rim compatibility, and actual axle weight more important than simply choosing by ply rating. A 14-ply or 16-ply label is useful, but the load index tells you more precisely what the tire is rated to carry.
Irregular wear is commonly caused by alignment problems, incorrect inflation pressure, wheel imbalance, worn steering or suspension components, mismatched tire sizes or pressures, aggressive turning, curb contact, or poor inspection practices. A quality tire can support even wear, but no steer-position tire can overcome poor alignment, wrong pressure, or mechanical problems.
Fleet maintenance schedules vary, but steer tire pressure should be checked regularly and consistently because inflation affects load capacity, tread wear, handling, heat buildup, and overall tire value. Alignment should be checked when irregular wear appears, after front-end repairs, after suspension work, or when the truck shows pulling, vibration, or uneven shoulder wear.
MP991 is primarily positioned as a commercial truck steer tire. Some rib-style tires may be suitable for certain all-position applications depending on size, axle position, load, route, and fleet requirements. The final decision should always match the tire size, load index, rim, inflation pressure, and actual application. For broader axle-position flexibility, compare the dedicated All Position Tires page.
MP991 is positioned as a high-value commercial truck steer tire for fleets, dealers, and distributors that want dependable performance without premium-brand pricing. Its five-rib pattern, wide footprint, siping, and commercial-duty construction are designed to support stability, wet-road control, heat dispersion, and even wear. The goal is strong steer-axle value: reliable highway performance, competitive pricing, and a product line built for North American commercial truck applications.
Choose a steer tire like MP991 when the tire is used on the front axle and the priority is control, straight-line stability, even wear, wet-road handling, and front axle load support. Choose a drive tire when the priority is traction, torque transfer, tread bite, and pulling power. Steer and drive tires are built for different jobs, so using the correct tire position helps improve safety, performance, and cost per mile.
Muscle Power Tires is a manufacturer-direct commercial truck tire brand. We work primarily with wholesale distributors, tire dealers, and large truck fleets. For single-truck or small retail purchases, please buy online when available or contact a local dealer/distributor carrying Muscle Power products.