Truck Tire Size Guide: OEM Charts, LT vs P-Metric, Load Ranges & Upgrade Rules
OEM sizes for F-150, Silverado, RAM, Tundra, and Tacoma. Load ranges, LT vs P-metric, biggest tires without a lift, plus-sizing, and towing safety — everything before you buy.
Need your exact stock size?
Use the driver-door placard first. It lists factory tire size, load rating, and cold PSI for your specific cab, drivetrain, and payload package.
Daily driver half-ton?
P-metric or lighter LT tires usually ride better, weigh less, and return better MPG than aggressive E-range tires.
Tow or haul often?
Load index and load range matter more than tread pattern. Never downgrade below the factory load capacity stamped on the placard.
Going bigger without a lift?
A safe starting rule is to stay within about 3% diameter increase before checking actual lock-to-lock and compression clearance.
Stepping up to 35s?
Plan for speedometer recalibration, reduced effective gearing, longer braking distances, and possible trimming or offset changes.
Confused by LT275/70R18?
LT = light truck construction, 275 = width in mm, 70 = sidewall ratio, R = radial, 18 = wheel diameter in inches.
Use the calculator for the exact math
Compare stock vs upgraded truck tire sizes in seconds
See diameter, sidewall, circumference, revolutions per mile, and speedometer difference before buying.
On this page
How to read a truck tire size
The sidewall tells you far more than diameter. It tells you construction type, width, sidewall height, load capacity, and whether the tire was built for passenger-duty or true truck-duty service.
That single line answers the questions most truck owners ask: Will it fit? Will it carry the load? Will it ride stiff? Is it a real truck tire or just a passenger tire on a truck?
LTService type
Light Truck construction. Built for higher load and inflation than passenger tires.
275Section width
The tire is about 275 mm wide at its widest point.
70Aspect ratio
Sidewall height is 70% of the 275 mm width.
RConstruction
Radial construction, standard on modern truck tires.
18Wheel diameter
Fits an 18-inch wheel only.
125/122Load index
Single / dual load index on some LT tires. Higher number = more carrying capacity.
SSpeed rating
Maximum speed capability for the tire when properly inflated and loaded.
ELoad range
Modern strength rating. E is commonly called 10-ply rated and usually supports up to 80 PSI.
A truck can come from the factory with P-metric tires, especially lighter-duty half-tons. Do not assume “it’s a truck” automatically means LT construction.
LT vs P-metric truck tires
This is the most misunderstood decision in truck fitment. Many owners upgrade to LT tires because they sound stronger, then hate the added harshness and weight. Others stay with soft passenger tires and discover trailer stability suffers.
| Factor | P-metric | LT | Usually Better |
|---|---|---|---|
| Ride comfort | Better for empty-truck commuting; softer sidewall and less harshness. | Stiffer feel, especially E-range. | P-metric |
| Towing and payload | Fine for lighter-duty use if the placard allows it. | Better reserve capacity and sidewall stability under load. | LT |
| Weight | Usually lighter, helping MPG and acceleration. | Heavier carcass and often worse fuel economy. | P-metric |
| Off-road durability | More vulnerable to punctures and sidewall cuts. | Stronger sidewalls and better impact resistance. | LT |
| Highway noise | Usually quieter. | Often louder, especially all-terrain and mud-terrain designs. | P-metric |
| Best use case | Daily driver, light towing, better comfort. | Frequent towing, gravel, work use, off-road, campers, trailers. | Depends |
Choose LT if...
You tow regularly near the truck’s real-world limits.
You carry tools, trailers, campers, or bed loads often.
You drive gravel, sharp rock, or job-site terrain and want stronger sidewalls.
Choose P-metric if...
Your truck is mostly a commuter or family vehicle.
You value comfort, wet braking, quiet highway manners, and lower cost.
You only tow lightly and the placard or replacement spec still meets the required load.
Truck tire load range chart
Load range is a strength category, not a literal count of plies. Modern tires still use the old “6-ply rated” or “10-ply rated” language, but what really matters is the load capacity at a specific inflation pressure.
| Load Range | Old Ply Term | Typical Max PSI | Best For |
|---|---|---|---|
| C | 6-ply rated | Up to 50 PSI | Lighter midsize trucks, softer ride, mild off-road use. |
| D | 8-ply rated | Up to 65 PSI | Balanced choice for midsize and half-ton trucks that tow regularly. |
| E | 10-ply rated | Up to 80 PSI | Heavy towing, payload, larger half-ton and 3/4-ton applications. |
| F | 12-ply rated | Often up to 95 PSI | Heavier commercial use and some 1-ton / work-truck applications. |
Never choose a replacement tire with less load capacity than the original equipment requirement. Diameter fitment is irrelevant if the tire cannot safely carry the truck’s axle load.
Ford F-150 stock tire sizes
Modern F-150s span everything from work-truck 17-inch setups to premium 22-inch packages and true off-road 35-inch or 37-inch Raptor sizes. That is why “F-150 tire size” is not a single answer.
| Trim / Package | Common OEM Size | Notes |
|---|---|---|
| XL / STX / XLT 17-inch | 245/70R17 or 265/70R17 | Common base and work-truck fitment. |
| XLT / Lariat 18-inch | 275/65R18 | One of the most common modern F-150 sizes. |
| Lariat / Platinum / King Ranch 20-inch | 275/60R20 | Popular OE 20-inch comfort / style package. |
| Limited / appearance 22-inch | 275/50R22 | Large wheel package; less sidewall, more style. |
| Tremor | 275/70R18 | Taller OE all-terrain fitment. |
| Raptor | LT315/70R17 or 37x12.50R17LT | Far beyond normal half-ton fitment rules. |
Silverado 1500 and Sierra 1500 stock sizes
GM half-tons share many wheel and tire patterns. Base trims stay conservative, while Trail Boss / AT4 packages shift the baseline upward with taller all-terrain rubber and extra clearance.
| Trim / Package | Common OEM Size | Notes |
|---|---|---|
| WT / Custom | 255/70R17 | Common entry-size Silverado 1500 fitment. |
| RST / LT / LTZ 18-inch | 265/65R18 | Frequent everyday Silverado size. |
| Custom / High Country 20-inch | 275/60R20 | Widely used on current 1500 trims. |
| High Country / Denali-style 22-inch | 275/50R22 | Lower-profile OE appearance option. |
| Trail Boss | 275/65R18 | Factory lift and taller all-terrain stance. |
RAM 1500 stock tire sizes
RAM fitment varies sharply between comfort-oriented trims and purpose-built off-road versions. Rebel and TRX are not normal references for standard street Rams.
| Trim / Package | Common OEM Size | Notes |
|---|---|---|
| Tradesman / base 17-inch | 245/70R17 or 265/70R17 | Basic work-truck size depending on package. |
| Big Horn / Lone Star 18-inch | 275/65R18 | Common everyday Ram 1500 fitment. |
| Laramie / Limited 20-inch | 275/55R20 or 275/60R20 | Watch wheel diameter and aspect ratio carefully. |
| Rebel | LT275/70R18 | Factory 33-ish all-terrain setup. |
| TRX | 325/65R18 | Special case; not a normal half-ton reference point. |
Toyota Tundra and Tacoma stock sizes
Toyota trucks deserve their own section because owners frequently compare stock fitment to 33-inch and 35-inch aftermarket builds. Tundra and Tacoma also behave differently when wheel offset changes.
| Model / Package | Common OEM Size | Notes |
|---|---|---|
| 2022+ Tundra 18-inch | 265/70R18 or 265/65R18 | Common non-TRD and entry configurations. |
| 2022+ Tundra 20-inch | 265/60R20 | Frequent Limited / Platinum-size baseline. |
| 2022+ Tundra TRD / off-road builds | 275/65R18 or 285/65R18 | Popular upgrade area near 33 inches. |
| Tacoma 16-inch | 245/75R16 | Long-running stock Tacoma size. |
| Tacoma 17-inch | 265/65R17 | Most common modern Tacoma street size. |
| Tacoma TRD Pro / large OE tire | 33-inch class | Newest off-road trims changed the factory baseline. |
Biggest tires without a lift
This is the highest-intent truck tire question online, and the honest answer is never just a number. Real fitment depends on stock diameter, true mounted width, wheel width, wheel offset, alignment, mud flaps, crash bars, and how much the tire grows under compression.
| Truck Type | Typical Stock Diameter | Reasonable No-Lift Ceiling | Watch For |
|---|---|---|---|
| Half-ton street trucks | 31–32 inch tires typical | Usually 32.5–33 inches with stock-ish offset | Mud flaps, crash bars, front liner contact at full lock and compression. |
| Factory off-road packages | Often already near 33 inches | Small jump only without trimming | Lock-to-lock clearance can disappear quickly with wider tires or lower offset wheels. |
| Midsize trucks | 30.5–31.5 inches common | 31.5–32.5 inches before real fitment work | Body mounts and front cab corners are common interference points. |
| Going to 35s | Major jump for most stock trucks | Usually requires lift, trimming, and wheel-offset planning | Speedometer, gearing, braking, CV angles, and bearing loads all change. |
Best rule: compare actual diameter first, then inspect clearance at straight ahead, full left lock, full right lock, and loaded compression. A tire that clears in the driveway may still hit at speed over a dip or with passengers, trailer tongue weight, or cargo.
Truck plus-sizing examples
Plus-sizing means increasing wheel diameter while keeping the tire’s overall diameter close to stock. It protects speedometer accuracy and gearing while changing appearance and sidewall height.
| Starting Size | +1 Wheel Step | +2 Wheel Step | Why It Works |
|---|---|---|---|
| 265/70R17 | 275/65R18 | 275/60R20 | Classic half-ton progression that keeps overall diameter very close to stock. |
| 255/70R17 | 265/65R18 | 275/60R20 | Common Silverado progression from 17-inch to 20-inch wheels. |
| 275/65R18 | 275/60R20 | 275/50R22 | Typical premium-trim move that preserves diameter but loses sidewall cushion. |
| 245/75R16 | 265/65R17 | 265/60R18 | Traditional Tacoma street progression. |
What bigger truck tires actually change
Bigger tires are not just a cosmetic mod. They change mechanical leverage, weight, braking feel, and the entire calibration baseline of the truck.
Speedometer error
A taller tire travels farther per wheel rotation, so the speedometer and odometer read low unless recalibrated.
Effective gearing
Bigger tires reduce the effective axle ratio. The truck feels taller-geared and slower off the line.
Braking distance
Heavier tires increase rotating mass and can lengthen stopping distances.
Fuel economy
Heavier, wider, and more aggressive tires often reduce MPG noticeably.
Steering feel
Wider tires and lower-offset wheels can increase kickback, scrub, tramlining, and bearing load.
Towing behavior
If load index is inadequate or the tire is too soft, trailer stability and heat tolerance can suffer.
Common truck tire fitment mistakes
The biggest truck tire mistakes are usually not about style. They happen when owners ignore load capacity, true measured size, or the ripple effects of diameter and offset changes.
Buying by diameter only
Two 33-inch tires can have very different width, load index, tread design, and real mounted size. Diameter alone is not enough.
Ignoring load index
The truck may physically fit the tire but still be unsafe for towing or payload if the load rating is lower than OEM.
Using extreme offset to clear suspension
Pushing the wheel outward can solve inner clearance but create outer rub, heavier steering, and more bearing stress.
Going straight to E-range for every truck
E-range sounds tough but often rides harsher and weighs more than the truck needs if it rarely tows or hauls.
Skipping recalibration after size changes
Speedometer, odometer, transmission behavior, and ADAS systems can all be affected by a major diameter change.
Copying another owner’s fitment blindly
Bed length, cab, trim, wheel width, alignment, mud flaps, and brand-to-brand tire variation all change the result.
Before ordering truck tires
Run the stock vs upgrade comparison first
Compare any two truck tire sizes for diameter change, sidewall difference, circumference, and speedometer error.
OEM sizes in this guide are consolidated from common current-generation trim patterns and public fitment references. Manufacturers can change wheel packages mid-cycle or by market. The placard on your specific truck is always the final authority.
Frequently asked questions
These are the truck tire size questions buyers ask right before spending money — and the answers that actually prevent bad purchases.