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Cooper DISCOVERER STT PRO LT315/70R17/10 121/118Q
You're viewing new Cooper Discoverer STT Pro Tire | LT315/70R17 | E | Manufacturer Part No 170119034.
Cooper Discoverer STT Pro
The Cooper Discoverer STT Pro is a radial, open-shoulder drive tire built for mixed-service work where traction and self-cleaning tread voids matter. It is commonly selected for vocational use that sees a combination of pavement, gravel, dirt, and jobsite surfaces. This page focuses on practical model details, including design characteristics, fitment guidance using approved sizes, and how the Discoverer STT Pro is typically evaluated against comparable mud-terrain drive tires.
Discoverer STT Pro application and intended use
The Cooper Discoverer STT Pro is positioned for mixed-service, drive-axle use where vehicles regularly transition between paved routes and loose or soft surfaces. Its open-shoulder layout is intended to help clear debris and maintain bite in mud, ruts, and uneven jobsite terrain. This model is often chosen when a more aggressive tread pattern is preferred over a closed-shoulder all-terrain design. For fleets and operators, it is typically considered for vocational schedules that include variable traction demands, with selection guided by the correct size, load requirements, and available clearance.
Tread design and key features
A defining element of the Cooper Discoverer STT Pro is its open-shoulder tread, which uses wider voids and pronounced shoulder edges to promote self-cleaning and forward traction in loose material. The block pattern is arranged to provide multiple biting edges, with void spacing that helps reduce packing in softer ground. As a mud-terrain pattern, it is typically prioritized for off-pavement control rather than quiet highway manners. When evaluating the Discoverer STT Pro, focus on how its tread layout aligns with your most common surfaces and whether your duty cycle justifies an aggressive, open-shoulder design.
Radial construction and durability considerations
The Cooper Discoverer STT Pro uses radial construction, a common choice for mixed-service work because it balances heat management and on-road stability with flexibility over uneven surfaces. In real-world selection, durability is influenced as much by correct application as by the tire itself, including alignment, inflation practices, and avoiding chronic overloading. An open-shoulder mud-terrain design can also be more vulnerable to irregular wear if rotated inconsistently or run underinflated for long periods. For the best results, match the tire to the drive position, confirm wheel fitment, and maintain vehicle setup so the tread can wear evenly.
Discoverer STT Pro sizes and fitment guide
The Cooper Discoverer STT Pro is offered in a broad range of approved sizes, including both flotation-style and metric formats. Common fitment searches include 215/85R16, 235/85R16, 245/75R16, 265/70R17, 285/70R17, and 305/70R18, along with larger options such as 35X12.50R17, 37X12.50R20, and 40X13.50R17. Fitment should be confirmed by wheel diameter and width, as well as overall clearance at full steering and suspension travel. For mixed-service setups, also verify that the selected size matches your vehicle’s load requirements and gearing expectations.
Cooper Discoverer STT Pro comparisons
When shopping within this category, the Cooper Discoverer STT Pro is commonly cross-shopped against other aggressive traction-focused tires such as the BFG KM3, Toyo Open Country MT, Nitto Trail Grappler, and Cooper Discoverer STT Maxx. Comparisons typically come down to tread pattern preferences, sizing availability for a specific wheel setup, and how much off-pavement time the vehicle sees. If you are deciding between the Discoverer STT Pro and an all-terrain option like the BFG KO2 or Cooper AT3, the key tradeoff is usually between an open-shoulder mud-terrain layout and a more road-oriented tread design.
Buying guidance for Cooper Discoverer STT Pro
To buy the Cooper Discoverer STT Pro with fewer surprises, start by selecting the exact approved size that matches your wheel diameter, intended ride height, and available clearance. Next, confirm the tire’s intended position is the drive axle and that your application truly benefits from an open-shoulder mud-terrain tread. For mixed-service operations, prioritize consistent fitment across axles and confirm your service plan can support regular rotations and inspections. If you are comparing prices, ensure you are comparing the same size and specification, since similar-looking size formats can differ in overall dimensions and fitment requirements.
Recommendations and practical tips
The Cooper Discoverer STT Pro is typically recommended for operators who need a radial, open-shoulder drive tire for mixed-service work that includes dirt, gravel, mud, and jobsite conditions. It fits best when traction and self-cleaning tread voids are priorities and when the vehicle setup can accommodate a more aggressive mud-terrain pattern. It is most appropriate for applications where off-pavement control is a frequent requirement, not an occasional exception.
When we recommend it:
- Mixed-service vocational routes that regularly include soft or loose terrain
- Drive-axle use where open-shoulder self-cleaning is a priority
- Vehicles that can support the required clearance for larger tread patterns
- Operators who can maintain regular rotation and inspection intervals
- Builds where traction-focused tread selection is preferred over road-focused tread
When to consider other options:
- Primarily highway use where a less aggressive, closed-shoulder tread is preferred
- Applications that require a steer or trailer position tire instead of drive
- Cases where available clearance, gearing, or wheel width limits the approved sizes
- When minimizing pattern noise is a higher priority than off-pavement traction
Expert tips:
- Confirm the exact size format before ordering, especially when comparing flotation-style and metric sizes
- Verify wheel width compatibility for the chosen size to avoid improper tread shape and wear
- Check for clearance at full lock and full compression, not just at ride height
- If mixing sizes front to rear, account for overall diameter differences that can affect driveline behavior
- Keep axle pairing consistent so tread depth and overall diameter stay matched on the drive axle
Usage and care tips:
- Set inflation based on your vehicle’s requirements and operating load, then recheck regularly
- Rotate on a consistent schedule to reduce the risk of irregular wear common in aggressive patterns
- Inspect tread and sidewalls after jobsite use and remove embedded debris when found
- Maintain alignment and address suspension wear early to protect an open-shoulder tread from uneven wear
- Avoid extended high-speed operation when conditions and loads are not suitable for it
Buying guidance from NeoTires
We recommend the Cooper Discoverer STT Pro for drivers who regularly split time between pavement and loose, messy surfaces where an open-shoulder mud-terrain tread makes sense. It is a practical choice when self-cleaning voids and off-pavement control matter more than quiet road behavior. The best results come from selecting the correct approved size, confirming clearance, and keeping up with inflation checks and a consistent rotation routine for aggressive tread patterns.
Best fit scenarios:
- Mixed-service routes that include gravel, dirt, and jobsite surfaces, not just occasional off-road trips
- Drive-axle setups where an open-shoulder tread is preferred for clearing mud and debris
- Builds where your wheel diameter matches an approved Discoverer STT Pro size, and you have verified clearance at full lock and suspension travel
- Operators who plan for routine inspections after jobsite use and regular rotations to manage wear
When to pause and check fitment:
- If your vehicle is primarily highway-driven and you are sensitive to tread sound from aggressive mud-terrain patterns
- If you are unsure the tire is intended for your axle position, this page focuses on drive-position use
- If you are switching between metric and flotation-style sizing, confirm overall diameter, wheel width compatibility, and clearance
- If you are mixing sizes front to rear, confirm diameter differences will not create driveline issues on the drive axle
Why customers trust NeoTires:
- Tire experts available via chat, phone, or text to confirm the right size format and application
- Fitment support that includes wheel diameter, wheel width, and clearance checks based on your setup
- Help coordinating multi-tire and fleet orders, including consistent sizing across axles when needed
- Proactive delivery coordination across warehouses and carriers to reduce delays and surprises
Confirm your size and fitment before you order
Tell us your vehicle, wheel size, and the Discoverer STT Pro size you are considering. We will help you verify the correct format and basic clearance checks.
Actions:
Get help comparing mud-terrain options
If you are cross-shopping the Discoverer STT Pro against similar mud-terrain tires, we can walk through fitment, tread style preference, and your real duty cycle.
Actions:
Need a quote for a set or fleet order
Share the sizes and quantities you need, and we will help coordinate availability and delivery for a smooth purchase.
Actions:
Cooper Discoverer STT Pro
The Cooper Discoverer STT Pro is a radial, open-shoulder drive tire built for mixed-service work where traction and self-cleaning tread voids matter. It is commonly selected for vocational use that sees a combination of pavement, gravel, dirt, and jobsite surfaces. This page focuses on practical model details, including design characteristics, fitment guidance using approved sizes, and how the Discoverer STT Pro is typically evaluated against comparable mud-terrain drive tires.
Discoverer STT Pro application and intended use
The Cooper Discoverer STT Pro is positioned for mixed-service, drive-axle use where vehicles regularly transition between paved routes and loose or soft surfaces. Its open-shoulder layout is intended to help clear debris and maintain bite in mud, ruts, and uneven jobsite terrain. This model is often chosen when a more aggressive tread pattern is preferred over a closed-shoulder all-terrain design. For fleets and operators, it is typically considered for vocational schedules that include variable traction demands, with selection guided by the correct size, load requirements, and available clearance.
Tread design and key features
A defining element of the Cooper Discoverer STT Pro is its open-shoulder tread, which uses wider voids and pronounced shoulder edges to promote self-cleaning and forward traction in loose material. The block pattern is arranged to provide multiple biting edges, with void spacing that helps reduce packing in softer ground. As a mud-terrain pattern, it is typically prioritized for off-pavement control rather than quiet highway manners. When evaluating the Discoverer STT Pro, focus on how its tread layout aligns with your most common surfaces and whether your duty cycle justifies an aggressive, open-shoulder design.
Radial construction and durability considerations
The Cooper Discoverer STT Pro uses radial construction, a common choice for mixed-service work because it balances heat management and on-road stability with flexibility over uneven surfaces. In real-world selection, durability is influenced as much by correct application as by the tire itself, including alignment, inflation practices, and avoiding chronic overloading. An open-shoulder mud-terrain design can also be more vulnerable to irregular wear if rotated inconsistently or run underinflated for long periods. For the best results, match the tire to the drive position, confirm wheel fitment, and maintain vehicle setup so the tread can wear evenly.
Discoverer STT Pro sizes and fitment guide
The Cooper Discoverer STT Pro is offered in a broad range of approved sizes, including both flotation-style and metric formats. Common fitment searches include 215/85R16, 235/85R16, 245/75R16, 265/70R17, 285/70R17, and 305/70R18, along with larger options such as 35X12.50R17, 37X12.50R20, and 40X13.50R17. Fitment should be confirmed by wheel diameter and width, as well as overall clearance at full steering and suspension travel. For mixed-service setups, also verify that the selected size matches your vehicle’s load requirements and gearing expectations.
Cooper Discoverer STT Pro comparisons
When shopping within this category, the Cooper Discoverer STT Pro is commonly cross-shopped against other aggressive traction-focused tires such as the BFG KM3, Toyo Open Country MT, Nitto Trail Grappler, and Cooper Discoverer STT Maxx. Comparisons typically come down to tread pattern preferences, sizing availability for a specific wheel setup, and how much off-pavement time the vehicle sees. If you are deciding between the Discoverer STT Pro and an all-terrain option like the BFG KO2 or Cooper AT3, the key tradeoff is usually between an open-shoulder mud-terrain layout and a more road-oriented tread design.
Buying guidance for Cooper Discoverer STT Pro
To buy the Cooper Discoverer STT Pro with fewer surprises, start by selecting the exact approved size that matches your wheel diameter, intended ride height, and available clearance. Next, confirm the tire’s intended position is the drive axle and that your application truly benefits from an open-shoulder mud-terrain tread. For mixed-service operations, prioritize consistent fitment across axles and confirm your service plan can support regular rotations and inspections. If you are comparing prices, ensure you are comparing the same size and specification, since similar-looking size formats can differ in overall dimensions and fitment requirements.
Recommendations and practical tips
The Cooper Discoverer STT Pro is typically recommended for operators who need a radial, open-shoulder drive tire for mixed-service work that includes dirt, gravel, mud, and jobsite conditions. It fits best when traction and self-cleaning tread voids are priorities and when the vehicle setup can accommodate a more aggressive mud-terrain pattern. It is most appropriate for applications where off-pavement control is a frequent requirement, not an occasional exception.
When we recommend it:
- Mixed-service vocational routes that regularly include soft or loose terrain
- Drive-axle use where open-shoulder self-cleaning is a priority
- Vehicles that can support the required clearance for larger tread patterns
- Operators who can maintain regular rotation and inspection intervals
- Builds where traction-focused tread selection is preferred over road-focused tread
When to consider other options:
- Primarily highway use where a less aggressive, closed-shoulder tread is preferred
- Applications that require a steer or trailer position tire instead of drive
- Cases where available clearance, gearing, or wheel width limits the approved sizes
- When minimizing pattern noise is a higher priority than off-pavement traction
Expert tips:
- Confirm the exact size format before ordering, especially when comparing flotation-style and metric sizes
- Verify wheel width compatibility for the chosen size to avoid improper tread shape and wear
- Check for clearance at full lock and full compression, not just at ride height
- If mixing sizes front to rear, account for overall diameter differences that can affect driveline behavior
- Keep axle pairing consistent so tread depth and overall diameter stay matched on the drive axle
Usage and care tips:
- Set inflation based on your vehicle’s requirements and operating load, then recheck regularly
- Rotate on a consistent schedule to reduce the risk of irregular wear common in aggressive patterns
- Inspect tread and sidewalls after jobsite use and remove embedded debris when found
- Maintain alignment and address suspension wear early to protect an open-shoulder tread from uneven wear
- Avoid extended high-speed operation when conditions and loads are not suitable for it
Buying guidance from NeoTires
We recommend the Cooper Discoverer STT Pro for drivers who regularly split time between pavement and loose, messy surfaces where an open-shoulder mud-terrain tread makes sense. It is a practical choice when self-cleaning voids and off-pavement control matter more than quiet road behavior. The best results come from selecting the correct approved size, confirming clearance, and keeping up with inflation checks and a consistent rotation routine for aggressive tread patterns.
Best fit scenarios:
- Mixed-service routes that include gravel, dirt, and jobsite surfaces, not just occasional off-road trips
- Drive-axle setups where an open-shoulder tread is preferred for clearing mud and debris
- Builds where your wheel diameter matches an approved Discoverer STT Pro size, and you have verified clearance at full lock and suspension travel
- Operators who plan for routine inspections after jobsite use and regular rotations to manage wear
When to pause and check fitment:
- If your vehicle is primarily highway-driven and you are sensitive to tread sound from aggressive mud-terrain patterns
- If you are unsure the tire is intended for your axle position, this page focuses on drive-position use
- If you are switching between metric and flotation-style sizing, confirm overall diameter, wheel width compatibility, and clearance
- If you are mixing sizes front to rear, confirm diameter differences will not create driveline issues on the drive axle
Why customers trust NeoTires:
- Tire experts available via chat, phone, or text to confirm the right size format and application
- Fitment support that includes wheel diameter, wheel width, and clearance checks based on your setup
- Help coordinating multi-tire and fleet orders, including consistent sizing across axles when needed
- Proactive delivery coordination across warehouses and carriers to reduce delays and surprises
Confirm your size and fitment before you order
Tell us your vehicle, wheel size, and the Discoverer STT Pro size you are considering. We will help you verify the correct format and basic clearance checks.
Actions:
Get help comparing mud-terrain options
If you are cross-shopping the Discoverer STT Pro against similar mud-terrain tires, we can walk through fitment, tread style preference, and your real duty cycle.
Actions:
Need a quote for a set or fleet order
Share the sizes and quantities you need, and we will help coordinate availability and delivery for a smooth purchase.
Actions:
Do you have a question about DISCOVERER STT PRO LT315/70R17/10 121/118Q?
Yes. This page is scoped to the Mastercraft Courser Trail as a drive-position tire for mixed-service work. The open-shoulder tread design is typically chosen to support traction under power and to help clear loose material on surfaces like gravel and dirt. When selecting a drive tire, confirm that your application and service requirements match the tire you are buying, and verify that the exact size and specification you need are available in the Courser Trail lineup.
Mastercraft Courser Trail is available in 265/70R17, and it is also offered in many related fitments across the 17-inch category, including 225/65R17, 235/65R17, 235/75R17, 245/65R17, 245/70R17, 255/65R17, 255/70R17, 255/75R17, 265/65R17, 285/70R17, and P285/70R17. Before ordering, match the exact size on your current tire and verify clearance, wheel width compatibility, and service requirements so the replacement is a true fit.
The leading “P” in P265/70R16 is a size designation that appears on some fitments. It is important not to assume P-metric and non-P versions are interchangeable in every application. If your current tires show a P-metric size, it is best to replace with the same designation unless your equipment requirements and wheel specifications explicitly allow a change. Always confirm the full size string, verify that the load and speed requirements meet your needs, and check clearance before switching between closely related sizes.
Yes. Mastercraft Courser Trail is offered in several 20-inch sizes, including 265/50R20, 275/55R20, and 275/60R20. When selecting a 20-inch fitment, confirm the exact size you need, and verify that your wheels are the correct width for that size. Also compare overall diameter if you are changing from a different size, since even small changes can affect clearance and the way the vehicle sits. If you are unsure, start by matching the size currently installed.
Both the Mastercraft Courser Trail and the Cooper Discoverer AT3 are commonly considered by buyers who want an all-terrain, all-season tire for mixed surface use. A practical way to compare them is by tread layout and how each design balances open void space with block stability on pavement. Courser Trail uses an open-shoulder approach that is often selected when surface clearing and traction on loose material are priorities. The best choice depends on your most frequent surfaces, the sizes you need to run, and how you prioritize on-road feel versus off-road grip.
To check Mastercraft Courser Trail availability, start by confirming your exact size, then look for inventory tied to that specific fitment. Because the Courser Trail is offered in many sizes, availability can vary by size and by location. If you are shopping for a fleet, it is also helpful to check that all required positions can be matched with the same size and specification so you can maintain consistent fitment across units. If you are unsure which size to order, reference the size currently installed and verify wheel and clearance compatibility before purchase.
