What size are my OEM rims?
The OEM rim size is the wheel diameter in inches specified by the manufacturer, and you can confirm it by checking your door jamb sticker, the original window sticker (Monroney), the owner's manual, your VIN/build sheet, or by inspecting the wheel stamping on the rim (for example, 17x7.5J ET45).
The full answer: OEM rims are selected to match the vehicle's design, braking, and suspension; sizes typically range from 16 to 20 inches for modern cars, SUVs, and trucks, and you'll find the exact metric and bolt pattern on the sources below. In this article we walk you through how to locate and read the size, what the numbers mean, and how to ensure replacements match OEM specs.
Where to look for the OEM rim size
The following sources typically list the stock rim size or the factory wheel spec for your vehicle. Start with the easiest-to-access references first.
- Door jamb sticker (the Tire and Loading Information label). Look for entries for the wheel size or "Rim" size, often shown as something like 17x7.5, sometimes with an ET number for offset.
- Original window sticker (Monroney label) or dealer paperwork. This record usually lists the standard wheel size that came with the vehicle at sale.
- Owner’s manual or quick-start guides. Some models include wheel and tire size recommendations in the maintenance or technical specs section.
- Vehicle identification number (VIN) and build sheet. A dealer or a VIN-decoding tool can reveal the factory wheel size, bolt pattern, and offset.
- Wheel itself. The rim may be stamped with markings such as 7.5Jx17 ET45 or similar, indicating diameter, width, and offset.
If you can't locate one of these sources, contact a dealer with your VIN for the exact OEM specification or use an official parts catalog from the manufacturer.
What the numbers mean on your rims
Rim specifications are commonly written as a set of numbers and letters that describe diameter, width, the type of rim, and the mounting details. Understanding these will help you confirm the OEM size and assess compatibility with tires and braking components.
- Diameter and width: The most visible part is the "17x7.5" style, where 17 is the diameter (inches) and 7.5 is the width (inches).
- Rim contour: The letter following the width (often "J") describes the rim's flange shape and seating profile.
- Offset (ET): The ET value (e.g., ET45) indicates the distance between the hub mounting surface and the wheel's centerline; it affects clearance with brakes and suspension.
- Bolt pattern (PCD) and center bore: Common formats include "5x114.3" (five lug holes spaced 114.3 mm apart) and the center bore size (e.g., "66.1") that matches the hub bore.
- Compatibility notes: OEM rims are matched to the tire size, brake system, and suspension; mismatched sizes can affect speedometer accuracy, ABS, ride quality, and safety.
Understanding these numbers helps you verify whether a replacement wheel remains within OEM specifications or if a true upgrade requires additional considerations.
Why matching OEM size matters
Choosing the correct OEM rim size matters for vehicle safety, handling, and performance. Using the right diameter ensures the correct tire fitment, sensor operation (like TPMS), accurate speed readings, and appropriate brake clearance. It also preserves ride quality and alignment characteristics designed by the manufacturer.
When in doubt, consult your vehicle's dealer or a trusted tire shop. They can confirm the exact OEM rim size using your VIN and confirm compatibility with your tires and suspension.
Upgrading or changing rim sizes: a quick guide
If you’re considering aftermarket or upgraded wheels, follow these steps to stay aligned with OEM fitment principles:
- Identify your current OEM size using the methods above.
- Check the recommended tire sizes and load ratings for the new wheel diameter from the manufacturer or a reputable parts catalog.
- Evaluate clearance around brakes, suspension, and fenders; assess offsets to avoid rubbing or misalignment.
- Consider the impact on speedometer accuracy, TPMS, and ride quality.
Consult a professional installer to verify fit and to ensure tires are correctly mounted and balanced.
Summary
To determine your OEM rim size, start with official sources like the door sticker, window sticker, and owner's manual, then confirm with the wheel itself or a VIN/build sheet. The numbers you’ll encounter typically describe diameter, width, offset, bolt pattern, and center bore. Keeping OEM specs in mind helps ensure safe, reliable performance and compatibility with tires and braking systems. If you’re unsure, a dealer or tire shop can confirm the exact OEM size for your vehicle.
How do I find out my rim size?
You can find your rim size by looking at the tire's sidewall, the sticker on the driver's side door jamb, or the owner's manual. The rim diameter is the last number in the tire size code, which often looks like P215/60 R17, where '17' is the rim diameter in inches. You can also find it stamped on the rim itself, often with the width, like '18x7.5'.
From the tire or vehicle
- Read the tire sidewall: Look for a code such as P215/60 R17 or 205/55 R16. The last number in this series is the rim diameter (e.g., 17 or 16).
- Check the driver's door jamb: Open the driver's side door and look for a sticker, sometimes called a placard, with vehicle information, including the original equipment tire size.
- Consult the owner's manual: The manual contains your vehicle's specifications, including the correct rim size.
- Look for the manufacturer's sticker: This sticker, found on the driver's side doorjamb or in the glove box, provides the original equipment (OE) tire size, but it's important to check your current tires or the rim itself if you suspect the wheels have been changed.
From the rim
- Inspect the backside of the wheel: The size is often stamped into the metal, usually on the spokes or the backside.
- Look for the "18x7.5" format: The first number is the diameter in inches, and the second is the width in inches.
How do I know my OEM wheel size?
To find out the width of your stock wheel, you must look at the back side of the rim itself. Imprinted on a spoke of the OEM wheel is a number, such as 16x7. The “16” refers to the diameter, another way to discover this element, and the “7” refers to the rim's width.
How to identify OEM rims?
Many times you can identify a factory OEM rim by checking for the vehicle maker logo on the backside (Think Ford logo, Chevy logo, etc), and also there will almost always be OEM type numbers on the back of the wheel which sometimes includes the actual part number.
What does 4.80 4.00 mean?
The numbers 4.80/4.00-8 read like this: 4.80" is the tire width, 4.00" is the tire section height (from the inside of the donut hole to the outside) and the 8" is the wheel diameter. Finally, the numbers 4.80-8 read like this: 4.80" is the tire width and "8 is the wheel diameter.
