2003 GMC GMC Sierra — K1500 Reg Cab
The 2003 GMC GMC Sierra K1500 Reg Cab 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.
245/75R16
| Section width | 245 mm |
|---|---|
| Aspect ratio (sidewall height) | 75% (183.8 mm) |
| Rim diameter | 16" |
| Overall tire diameter | ~30.5" |
| Revolutions per mile | ~662 |
- Check 245/75R16 price at TireRack
- Check 245/75R16 price at SimpleTire
- Check 245/75R16 price at Priority Tire
Some links on this page are affiliate links — see our disclosure.
265/75R16
| Section width | 265 mm |
|---|---|
| Aspect ratio (sidewall height) | 75% (198.8 mm) |
| Rim diameter | 16" |
| Overall tire diameter | ~31.6" |
| Revolutions per mile | ~637 |
- Check 265/75R16 price at TireRack
- Check 265/75R16 price at SimpleTire
- Check 265/75R16 price at Priority Tire
Some links on this page are affiliate links — see our disclosure.
Other 2003 GMC GMC Sierra trims
- C1500 Ext Cab 235/75R16 / 255/70R16
- C1500 Reg Cab 235/75R16 / 255/70R16
- C1500HD Crew 245/75R16
- C2500 Ext Cab 245/75R16
- C2500 Reg Cab 245/75R16
- C3500 215/85R16
- Denali 265/70R17
- K1500 Ext Cab 245/75R16 / 265/75R16 / 265/70R17
- K1500HD Crew 245/75R16
- K2500 Ext Cab 245/75R16
- K2500 Reg Cab 245/75R16
- K3500 215/85R16
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.