2021 Ford F350 — Lariat 4wd
The 2021 Ford F350 Lariat 4wd shipped with 4 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.
This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.
275/65R18
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 65% (178.8 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~32.1" |
| Revolutions per mile | ~629 |
- Check 275/65R18 price at TireRack
- Check 275/65R18 price at SimpleTire
- Check 275/65R18 price at Priority Tire
Some links on this page are affiliate links — see our disclosure.
275/70R18
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 70% (192.5 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~33.2" |
| Revolutions per mile | ~608 |
- Check 275/70R18 price at TireRack
- Check 275/70R18 price at SimpleTire
- Check 275/70R18 price at Priority Tire
Some links on this page are affiliate links — see our disclosure.
285/75R18
| Section width | 285 mm |
|---|---|
| Aspect ratio (sidewall height) | 75% (213.8 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~34.8" |
| Revolutions per mile | ~579 |
- Check 285/75R18 price at TireRack
- Check 285/75R18 price at SimpleTire
- Check 285/75R18 price at Priority Tire
Some links on this page are affiliate links — see our disclosure.
275/65R20
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 65% (178.8 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~34.1" |
| Revolutions per mile | ~592 |
- Check 275/65R20 price at TireRack
- Check 275/65R20 price at SimpleTire
- Check 275/65R20 price at Priority Tire
Some links on this page are affiliate links — see our disclosure.
Other 2021 Ford F350 trims
- Dually 245/75R17
- King Ranch 2wd 275/65R18
- King Ranch 4wd 275/65R18 / 275/70R18 / 285/75R18 / 275/65R20
- Lariat 2wd 275/65R18
- Limited 275/65R20
- Platinum 275/65R20
- XL 2wd 245/75R17 / 265/70R17 / 275/65R18
- XL 4wd 245/75R17 / 265/70R17 / 275/65R18 / 275/70R18
- XLT 2wd 275/65R18
- XLT 4wd 275/65R18 / 275/70R18 / 285/75R18 / 275/65R20
How to read a tire size
A tire size like 225/45R17 breaks down into three parts:
the first number is the section width in millimeters
(the tire's width from sidewall to sidewall), the second is the
aspect ratio — the sidewall's height as a percentage of
that width — and the number after the "R" is the rim
diameter in inches. A letter prefix (P or LT) indicates
Passenger or Light Truck construction; its absence usually means
Euro-metric sizing.
Some trucks and off-road tires instead use "flotation" sizing, like
37X12.50R17 — here the numbers are the tire's overall
diameter and width in inches directly, with the rim diameter last.
Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.