2008 Ford F250 — FX4 Crew Cab 4x4 With TPMS

The 2008 Ford F250 FX4 Crew Cab 4x4 With TPMS shipped with 2 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.

275/70R18

Section width275 mm
Aspect ratio (sidewall height)70% (192.5 mm)
Rim diameter18"
Overall tire diameter~33.2"
Revolutions per mile~608

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275/65R20

Section width275 mm
Aspect ratio (sidewall height)65% (178.8 mm)
Rim diameter20"
Overall tire diameter~34.1"
Revolutions per mile~592

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What this size means for your Ford F250

On the 2008 Ford F250 FX4 Crew Cab 4x4 With TPMS, the factory 275/70R18 measures about 33.2″ in overall diameter with a 192.5 mm (7.6″) sidewall, and completes roughly 608 revolutions per mile. Its 70-series aspect ratio gives a tall sidewall of the kind used on trucks, SUVs, and older passenger cars, built for cushioning and load. In tire terms it is a passenger (P-metric / Euro-metric) size.

The 275/70R18 and 275/65R20 differ by about 0.9″ (2.7%) in overall diameter; a gap this size is enough to affect speedometer and odometer readings, so confirm which one your vehicle actually left the factory with.

On a vehicle of this age, the Ford F250 may have been refitted with a slightly different replacement size somewhere in its life, so check the current sidewall — not just the factory spec — before buying.

Other 2008 Ford F250 trims

Ford F250 tire sizes by year

See every Ford F250 year & trim →

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.