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Flotation (Inches) to Metric Conversion

37x12.50R17 in Metric

Best Metric Match355/65R17
Millimeter Size940 Γ— 318R17
Overall Diameter
37.0"
(939.8 mm)
Section Width
12.50"
(317.5 mm)
Sidewall Height
10.00"
(254.0 mm)
Wheel Rim Diameter
17"
Rim Size
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Direct Answer: What Metric Tire Replaces a 37x12.50R17?The closest exact metric equivalent to a 37x12.50R17 tire is 355/65R17. It measures 35.2" tall by 13.98" wide, which is within 1.8" of height and 1.48" of width of the flotation original.
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Top Metric Equivalents for 37x12.50R17

Ranked by closest physical match, wheel well clearance, and steering comfort.

Base Flotation: 37" Γ— 12.5"
Slightly Wider Option
Diameter:35.2"-1.8" diff
Width:13.98"+1.48" diff
Speed @ 65:61.8MPH
Why choose this: Massive width footprint for deep sand and extreme snow flotation.
View full 355/65R17 conversion specs→
Closest Exact Match
Diameter:35.6"-1.4" diff
Width:12.40"-0.10" diff
Speed @ 65:62.5MPH
Why choose this: Closest metric equivalent in 17" rim diameter.
View full 315/75R17 conversion specs→
OEM Factory Match
Diameter:34.4"-2.6" diff
Width:12.40"-0.10" diff
Speed @ 65:60.4MPH
Why choose this: Common stepping stone for drivers wanting less axle stress and better fuel economy.
View full 315/70R17 conversion specs→
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Why Switch From Flotation (37x12.50R17) to Metric?

Real benefits for truck, Jeep, and overland builds.

1. Save $150 to $300 Per Set

Metric tires are manufactured by the millions as factory original equipment for trucks like the Raptor, Tremor, and Rubicon. Flotation sizes are specialty aftermarket tires with lower production runs and higher retail prices.

2. Factory Rim Width Compliance

Most stock truck wheels are 7.5" to 8.5" wide. Tire manufacturers specify that 12.50" wide flotation tires require at least an 8.5" or 9.0" rim. Commercial shops (Costco, Discount Tire) will mount metric sizes like 285/70 or 295/70 without refusal.

3. Reduced Weight & Less Scrub Rub

A 12.50" wide tire creates a wider scrub radius that rubs against the front sway bar, crash bars, and frame. Choosing a metric equivalent gives you the exact same height with a narrower tread that clears without cutting.

Editor's Note on 37x12.50R17:While 37-inch flotation tires dominate hardcore off-roading, metric equivalents are heavily sought after by overlanders and European/Australian import owners needing ECE-certified metric designations for road-legal inspections.
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37x12.50R17 Vehicle Fitment & Clearance

Common trucks, Jeeps, and lift requirements.

Popular Vehicle PlatformsJeep Wrangler Rubicon (with 3.5"+ lift), Ford F-150 Raptor 37 Package, Ram TRX, Heavy Duty Rock Crawlers
Required Lift / Modification3.5" to 4.5" suspension lift, re-gearing to 4.88 or 5.13 recommended
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Frequently Asked Questions: 37x12.50R17 Metric Equivalents

What is the metric equivalent of a 37x12.50R17 tire?β–Ό

The closest metric equivalent of a 37x12.50R17 tire is 355/65R17, which measures 35.2 inches in diameter and 13.98 inches in width. Other popular metric alternatives include 315/75R17 (35.6"x12.4"), 315/70R17 (34.4"x12.4") depending on whether you want a wider or narrower profile.

What does 37x12.50R17 measure in millimeters?β–Ό

A 37x12.50R17 tire measures exactly 939.8 mm in overall diameter, 317.5 mm in section width, and 254.0 mm in sidewall height, mounted on a 17-inch wheel.

Why should I buy a metric tire instead of flotation inches?β–Ό

Metric tire sizes (such as 285/70R17, 295/70R18, or 315/70R17) are manufactured in significantly higher volumes for factory vehicles like the Ford Raptor and Bronco Sasquatch. This makes them $30 to $60 cheaper per tire. Metric sizes also offer a wider selection of heavy-duty Load Range E (10-ply) ratings for towing, weigh less (saving gas and making your truck feel peppier), and safely fit factory wheels without tire shop mounting issues.

Will a 37x12.50R17 rub on a stock truck?β–Ό

Fitment depends on vehicle ride height. 3.5" to 4.5" suspension lift, re-gearing to 4.88 or 5.13 recommended. On modern half-ton trucks (F-150, Silverado, Tacoma), full 12.50-inch wide tires often rub the sway bar or crash bars at full steering lock, which is why narrower metric sizes like 355/65R17 are preferred.

Explore Other Flotation (Inches) to Metric Conversions