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37x12.50R20 Tires for Lifted Trucks in Tampa, FL

37x12.50R20 is the dominant heavy-duty diesel and serious-build half-ton size. At 37 inches tall and 12.5 inches wide on a 20-inch wheel, it sits 5 inches taller than a stock half-ton tire and gives a one-ton diesel an honest 2 inches of additional ground clearance under the differential. It's almost always paired with a 4-6 inch suspension lift on Super Duty and HD trucks, or a 6 inch lift plus bumper trimming on half-tons. The size is the natural home of the Nitto Ridge Grappler hybrid, the Toyo Open Country M/T mud-terrain, the BFG KM3, and the Mickey Thompson Baja Boss A/T. Buyers stepping up from 35s often underestimate three things: weight (a 37x12.50R20 in load range E is 78-85 pounds, which is hard on factory wheel bearings and unit hubs), gear ratio (stock 3.42-3.73 axles feel sluggish), and the spare-tire problem (no factory spare carrier on any half-ton or even most HD trucks accepts a 37, so plan on relocating the spare or running a swing-out rear bumper). For Tampa-area diesel owners who tow a fifth wheel or boat and also want trail capability, 37x12.50R20 in a hybrid tread is the most balanced build available.

37″ Overall Diameter
12.5″ Section Width
20″ Wheel Rim
4-6 inch suspension lift (HD trucks); 6 inch lift on half-tons Lift Needed
$400–$720 Per Tire

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Will 37x12.50R20 fit my truck?

The HD diesel and dedicated trail-rig size. You don't put 37s on a truck by accident; this is a planned build that usually includes a regear, an HD spare carrier, and bumper trimming. Most 37x12.50R20s in Florida live on lifted F-250 Powerstrokes, Ram 2500 Cummins, and Duramax 2500HDs.

Common fitments

  • Ford F-250/F-350 Super Duty with 4-6 inch lift
  • Ram 2500/3500 with 4-6 inch lift
  • Chevy Silverado 2500HD/3500HD with 4-6 inch lift
  • GMC Sierra 2500HD/3500HD with 4-6 inch lift
  • Ford F-150 Raptor with 2-3 inch lift
  • Ford F-150 (non-Raptor) with 6 inch lift, regear, and bumper work

37s on a Tampa-area diesel are a statement. They thrive on Withlacoochee River trail loops and Croom-area dirt, and they walk through soft sand like nothing else. The downside in Florida heat is real: a 37x12.50R20 in load range E weighs 78-85 pounds, and on a daily-driver truck doing 80 miles of I-75 each day, that translates to noticeably faster wear on ball joints, tie rod ends, and front wheel bearings. Plan on inspecting front-end components every oil change.

Not sure if it fits?

Bring your truck by — we'll measure your wheel offset, check fender clearance at full lock, and confirm before any tire is mounted. No surprise rubbing.

Book a fitment check Call (813) 464-9023

Top brands in 37x12.50R20

Names lifted-truck owners actually pick. Live stock from our PartsTech dealer network.

  • Nitto Ridge Grappler
  • Toyo Open Country M/T
  • Toyo Open Country R/T
  • BFGoodrich All-Terrain T/A KO2
  • BFGoodrich Mud-Terrain T/A KM3
  • Mickey Thompson Baja Boss A/T
  • Nitto Trail Grappler M/T

Tread profiles available in 37x12.50R20

Pick a tread style that matches how you actually drive — daily commute, weekend trails, or full-time mud.

  • Mud-Terrain (M/T)
  • Hybrid Rugged-Terrain (R/T)
  • All-Terrain (A/T)

37x12.50R20 questions, answered straight

The questions we get most often from Tampa truck owners shopping this size.

Do I really need a 6 inch lift for 37x12.50R20?
On a Ram 2500 or F-250, a 4 inch lift with 20x10 -24 offset wheels and some inner fender trim will clear 37x12.50R20s. A 6 inch long-arm kit gives you more headroom for full articulation off-road without rub. On a half-ton (F-150, Silverado 1500, Ram 1500), 37s really do require a 6 inch lift plus bumper trimming and pinch-weld work, and even then you're at the absolute fitment limit.
What gear ratio do I need for 37s on a diesel?
On a Ram 2500 Cummins or F-250 Powerstroke with stock 3.42 or 3.73 gears, going to 37s drops your effective ratio to roughly 3.10-3.40 equivalent. For mostly-highway driving and light towing, you can live with stock gears (you'll feel it on grades). For heavy towing or daily comfort, regear to 4.10 (35-37 inch tires) or 4.30 (37 inch tires under load). 4.56 and 4.88 ratios are typically reserved for 38-40 inch tire builds with heavy off-road bias.
Will 37x12.50R20 fit a stock Ford Raptor?
On a 2017+ Raptor, yes, with a small 2 inch leveling kit and 20x10 wheels at the right offset, 37x12.50R20 fits with minor trimming. The 2024+ Raptor R can run 37s with even less work. On a non-Raptor F-150, do not believe anyone telling you 37s fit on a stock-height truck without major surgery.
What's the difference between 37x12.50R20 and 37x13.50R20?
Both are 37 inches tall on a 20 inch wheel. The 12.50 is 12.5 inches wide, the 13.50 is 13.5 inches wide. The wider 37x13.50R20 looks chunkier and floats slightly better on sand, but it requires more aggressive negative offset and is much more likely to rub on a half-ton or even a leveled HD. If you're not certain you need the extra inch of section width, run the 12.50.
How long do 37x12.50R20 tires last?
It depends almost entirely on tread pattern and how the truck is driven. A pure mud-terrain like the Toyo Open Country M/T or BFG KM3 in this size typically gives you 35,000-50,000 miles on a daily driver. A hybrid like the Nitto Ridge Grappler or Toyo R/T tends to land in the 50,000-65,000 mile range. The Mickey Thompson Baja Boss A/T in 37 has a 50,000 mile warranty. Heavy-foot drivers, trucks that aren't rotated every 5,000 miles, and trucks running too low or too high pressure will wear through them much faster.

Sizes close to 37x12.50R20

Going up a size for more sidewall? Down a size to clear a smaller lift? Compare options.

Ready to mount 37x12.50R20?

Book installation at our Tampa shop — most tire installs take 60–90 minutes, mounted and balanced on the same day.

Schedule Installation Call (813) 464-9023

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