Off-Road / All-Terrain

275/70R18 Tire Size

275/70R18 sits in the sweet spot for full-size trucks and body-on-frame SUVs that need more sidewall and load capacity without stepping into true 35-inch territory. At roughly 33.2" overall on an 18-inch wheel (~7.6" sidewall), it adds clearance and a tougher footprint while staying close enough to common truck sizing for daily drivability.

  • Often selected for half-ton pickups, body-on-frame SUVs, and overland builds that want near-33" capability.
  • Strong LT / E-load availability for towing, payload, and heavier truck use — match load range to your placard.
  • Expect more rotational mass, slightly heavier steering, a small fuel-economy hit, and a speedometer that can read lower than actual speed vs shorter factory sizes.

At a Glance

Nominal dimensions calculated from the 275/70R18 size code (275/70R18). Load range and speed rating come from indexed manufacturer products when available. Our OEM database records this size across 2 vehicle models and 7 factory configurations from model years 2021–2023, 2025–2026.

Rim Diameter Calculated

18"

Section Width Calculated

275 mm

Aspect Ratio Calculated

70%

Load Range Manufacturer

C, D, E

Speed Rating Manufacturer

Q, R, S

Construction Standard

Radial

Applicable Tire Categories

Based on this size’s editorial category and exact-size product metadata. A size may support several uses without every product in the size belonging to every category.

SUV tire sizes Truck tire sizes Off-Road tire sizes Winter tire sizes EV tire sizes

Best For

  • Trucks, SUVs, and builds that need clearance, load capacity, or trail capability
  • Towing, payload, gravel, trails, or overland use with stronger LT options
  • Daily-driven trucks that still see mixed on/off-road miles

Consider Another Size If

  • Fuel economy, light steering, and factory-like ride comfort matter more than clearance
  • You prefer a smaller, more stock look or quieter highway manners
  • You need a dedicated extreme off-road size beyond mixed daily use

Real-World Impact

  • More ground clearance and a taller off-road footprint
  • Stronger load-carrying options for towing and payload
  • Heavier steering feel and a bit more rotational mass
  • Usually a small hit to fuel economy vs smaller highway sizes

Verified Vehicle Examples

Documented OE or commonly associated platforms for 275/70R18.

Documented fitment mappings for research. Vehicle clearance depends on trim, wheel offset, suspension height, and tire model — confirm fitment before buying.

Real Tires Available in This Size

Indexed manufacturer models confirmed in exact size 275/70R18

View all indexed tires →

Manufacturer-provided product/spec data from Michelin, Goodyear, BFGoodrich, Toyo, and Falken where available.

All-Terrain

All-Terrain T/A KO3

275/70R18 · 125/122S · Load Range E

All-Terrain

HD-Terrain T/A KT

275/70R18 · 125/122Q · Load Range E

All-Terrain

Open Country A/T III

275/70R18 · 125/122S · Load Range E

All-Terrain

Open Country A/T III Ev

275/70R18 · 116T · Load Range SL

All-Terrain

Rubitrek A/T

275/70R18 · 125/122S · Load Range E

All-Terrain

Wildpeak A/T4W

275/70R18 · 125/122S · Load Range E

Best Options by Use Case

All-Terrain

Best first stop for mixed daily driving, gravel, trails, and overland use.

Top pick

Michelin Ltx A/T2

Other options

  • Goodyear Discoverer Stronghold® AT

Highway / Touring

Better for road noise, towing stability, and long highway mileage.

Top pick

Michelin Defender Ltx M/S 2

Other options

  • Michelin Ltx A/T2

Winter

Use dedicated winter tires when snow and ice grip matter more than tread toughness.

Top pick

Goodyear Discoverer® Snow Claw® LT

Other options

  • Toyo Open Country WLT1
  • Goodyear Wintercommand® LT

Product Spec Comparison

Compare tread depth, weight, max load, pressure, and revs per mile for full-spec 275/70R18 products.

FAQ

Is 275/70R18 good for off-road?

Yes — 275/70R18 is a strong off-road and overland size because it gives a tall sidewall (about 7.58") on an 18-inch wheel while staying below true 35-inch territory (roughly 33.16" overall). The extra sidewall helps with rough-road compliance, aired-down traction, and rim protection compared with lower-profile highway sizes. It works especially well when paired with all-terrain, rugged-terrain, or mud-terrain tires.

What vehicles use 275/70R18 tires?

275/70R18 is most often seen on full-size pickups, body-on-frame SUVs, and off-road-oriented truck builds. It is commonly upgraded to on vehicles such as the Ford F-150, Ram 1500, Toyota 4Runner, Chevrolet Silverado 1500, GMC Sierra 1500, and similar 4x4 platforms. Always confirm clearance, wheel offset, trim package, and load requirements before treating it as a direct factory replacement.

What load ranges are available?

The most useful load ranges indexed for 275/70R18 are E, D, C, and SL, depending on the tire model and brand. E-load options are especially common in all-terrain and light-truck products, while some highway or SUV-oriented tires may use lighter-duty service descriptions. Match the load range to your GVWR and intended towing or payload use — not just the size code.

Which brands make 275/70R18 tires?

Indexed master-database coverage for this size includes BFGoodrich, Toyo, Falken, Goodyear, and Michelin. Availability still varies by load range, tread type, and season — check the product cards and full-spec table on this page for models currently listed.

How does 275/70R18 compare to 265/70R17?

275/70R18 is taller, wider, and usually heavier than 265/70R17 (33.16" vs 31.61" overall, about +1.6" / +4.9%). It gives more ground clearance and a larger tire footprint, but it can also slow acceleration slightly, add steering weight, and make the speedometer read lower than actual speed. It is a capability-focused upgrade, not a fuel-economy-focused one.

What is the load capacity of 275/70R18?

Load capacity depends on the exact tire, load index, and load range — not the size alone. Many 275/70R18 light-truck tires are available in E-load versions, often with service descriptions around 125/122, making them suitable for towing, payload, and heavier truck use. Always use the tire manufacturer’s load table and the vehicle placard when setting pressure or carrying heavy loads.

Formula & Methodology

Every dimension on this site is computed in code from the tire size label — we do not scrape or hand-copy manufacturer spec sheets for overall diameter or circumference.

  1. Parse the size label. Metric sizes (e.g. 275/70R18, LT265/75R16) and flotation sizes (e.g. 33x12.50R15) are parsed into section width, aspect ratio, construction type, and bead-seat wheel diameter.
  2. Derive nominal dimensions. Sidewall height = section width × aspect ratio ÷ 100. Overall diameter = wheel diameter + 2 × sidewall height. Rolling circumference = π × overall diameter. Revs per mile = 63,360 ÷ circumference (inches per mile). Revs per km uses the same circumference converted to millimetres.
  3. Compare two sizes. Diameter, width, sidewall, and circumference deltas are signed differences between parsed specs. Speedometer error assumes the cluster is calibrated to the reference tire: true speed = indicated speed × (new diameter ÷ reference diameter). Static ground clearance change uses half the overall-diameter delta at each axle.

Rim diameter shown on this page is always 18" — the bead-seat diameter encoded in 275/70R18.

Safety & Fitment Limitations

  • Calculated dimensions are nominal planning baselines from the size code — mounted tires can differ with tread depth, inflation, rim width, and production tolerance.
  • Always confirm 275/70R18 against the door placard or owner’s manual, including load index, load range, and speed rating for your vehicle.
  • Changing diameter affects speedometer accuracy, gearing feel, ABS/traction calibration, and clearance at fenders, control arms, and the spare well.
  • Vehicle examples and product cards are not a guarantee of fitment. Verify wheel diameter (18"), offset, and suspension setup before buying.

Sources & Review

Dimensions are calculated from the tire size label; product rows and fitment mappings come from documented manufacturer and OE sources where available.

  • Curated tire-size dataset. Production tire labels, vehicle categories, and optional load/speed ratings maintained in our internal catalog. Only field-valid sizes that round-trip through the parser are published.
  • ISO / ETRTO service-description tables. Load index → maximum load (kg) and speed rating symbol → maximum sustained speed (km/h) mappings embedded in our rating resolver, aligned with widely published ETRTO reference values.
  • Nominal tire geometry formulas. Overall diameter, sidewall, circumference, and revolutions per mile are calculated from the size code using standard metric and flotation geometric relationships — the same relationships used across the tire industry for nominal sizing.
  • Documented OE fitment mappings. Vehicle make, model, trim, and year-range associations linked to specific tire sizes in our fitment data. These are representative applications for research — always confirm against your door placard.
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Next step: compare 275/70R18 before changing tire sizes

Compare 275/70R18 against nearby sizes like 315/70R17, 285/65R20, 305/70R18 to check diameter change, speedometer impact, clearance, and fitment tradeoffs.

285/70R17 vs 275/70R18 See 275/70R18 product data