2003 Chevrolet Silverado — C1500 Ext

The 2003 Chevrolet Silverado C1500 Ext 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.

235/75R16

Section width235 mm
Aspect ratio (sidewall height)75% (176.3 mm)
Rim diameter16"
Overall tire diameter~29.9"
Revolutions per mile~675

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255/70R16

Section width255 mm
Aspect ratio (sidewall height)70% (178.5 mm)
Rim diameter16"
Overall tire diameter~30.1"
Revolutions per mile~671

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What this size means for your Chevrolet Silverado

On the 2003 Chevrolet Silverado C1500 Ext, the factory 235/75R16 measures about 29.9″ in overall diameter with a 176.3 mm (6.9″) sidewall, and completes roughly 675 revolutions per mile. Its 75-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 235/75R16 and 255/70R16 roll within 0.2″ (0.7%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.

On a vehicle of this age, the Chevrolet Silverado 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 2003 Chevrolet Silverado trims

Chevrolet Silverado tire sizes by year

See every Chevrolet Silverado 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.