MRF
MRF Steel Muscle S1R4 11R20 Load Range H All-Position Highway Radial Tire, Tube & Flap Set (Commercial Truck)
MRF Steel Muscle S1R4 11R20 Load Range H All-Position Highway Radial Tire, Tube & Flap Set (Commercial Truck)
SKU:11321900
In stock
Couldn't load pickup availability
- Free shipping on $70+
- Ships from US warehouse
- 30-day returns
MRF Steel Muscle S1R4 11R20 is an all-position highway radial commercial truck tire. Load Range H (16-ply rated).
The MRF Steel Muscle S1R4 is an all-steel radial truck tire built for all-position highway service. A flat tread profile promotes even wear, and a superior compound with a strong casing delivers high mileage and good retreadability. It is sold as a set that includes the tire, inner tube and flap.
Key features
- All-position highway rib tread
- Flat tread profile for even wear
- Strong casing for retreadability
- Sold as a set with tube and flap
Specifications
| Brand | MRF |
|---|---|
| Model | Steel Muscle S1R4 |
| Tire size | 11R20 |
| Rim diameter | 20 in |
| Load range | H (16-ply rated) |
| Construction | Radial |
| Tire type | All-Position Highway Radial (Tube-Type) |
| Category | Commercial truck tires |
| Severe snow rated (3PMSF) | No |
| Overall diameter (approx.) | 39.8 in |
| Section width (approx.) | 11.0 in |
| Revolutions per mile (approx.) | 507 |
| Weight (approx.) | 134 lb |
| Production year (DOT) | 2025 |
| Manufacturer part number | 11321900 |
| Sold as | Tire, tube and flap set |
| Condition | New |
Good to know
- Priced per tire — add 2 for a pair or 4 for a full set.
- Match the size printed on your current tire's sidewall (11R20) and use the same or a higher load index and speed rating.
- Free shipping to the lower 48 states by truck freight — curbside delivery, typically 5–10 business days; someone needs to be there to receive it. Alaska and Hawaii are quoted at checkout.
- Mounting and balancing are not included. Tires that have been mounted or driven on can't be returned.
Questions
Does 11R20 fit my vehicle?
It fits any vehicle whose tire placard (driver's door jamb) or current tire sidewall reads 11R20. Use the same size and the load and speed rating your placard calls for — or whatever your placard specifies. Not sure? Send us your vehicle's year, make, model and the size on your tires and we'll confirm.
What is Load Range H?
Load Range H is a 16-ply rated light-truck / trailer construction built for higher inflation pressures and heavier loads.
How many tires do I need to order?
The price is per tire. Order 2 for a pair, 4 for a full set (6 for dual-rear trucks).
How does it ship and what does shipping cost?
Free shipping to the lower 48 states by truck freight — curbside delivery, typically 5–10 business days; someone needs to be there to receive it. Alaska and Hawaii are quoted at checkout.
Can I return a tire?
Yes — unmounted, undriven tires can be returned within 30 days of delivery. Tires that have been mounted or driven on can't be returned. Mounting and balancing are not included.
How old is the tire?
Production year (DOT date) 2025 — stock rotates, so the tire you receive is from current inventory.
Shipping & delivery
Shipping & delivery
Free standard shipping on orders of $70 or more to the lower 48 states and DC; $8 on smaller orders. Express is $15 at checkout; Alaska and Hawaii are charged by weight. Orders ship from the warehouse closest to you — the same business day, or the next business day if ordered late in the day, on a weekend or holiday. Standard delivery takes 3–5 business days. Oversized items (bumpers, running boards, large tonneau covers, some marine equipment) ship LTL freight — we contact you to schedule delivery and a signature is required.
Returns & warranty
Returns & warranty
Unused, uninstalled parts in original packaging can be returned within 30 days of delivery. A restocking fee of up to 20% may apply depending on the product, and return shipping is the buyer’s responsibility unless the item arrived defective, damaged or incorrect. Items marked Final sale can't be returned. If a part fails, contact us with your order number and we'll help with the manufacturer's warranty claim.
Fitment & part numbers
Fitment & part numbers
Verify fitment with the manufacturer part number shown above and your vehicle’s year, make, model and trim. If the listing says “Fits select…”, confirm your exact application before ordering. Not sure? Send us your VIN and the part number and we’ll check it for you.
