How To Measure Tire Bolt Pattern | Get Wheel Fit Right

Count the lugs, measure the bolt circle, and match the pattern code to pick wheels that sit right on the hub.

Getting a wheel order wrong is a pain. The box shows up, the finish looks good, and then the holes don’t line up with the studs. That usually comes down to one missed number: the bolt pattern.

One small fix before you start: people often say “tire bolt pattern,” but the pattern belongs to the wheel and hub, not the tire itself. The wording is common, so you’ll still see it all over parts sites and forums.

If you want the basic method right away, here it is. Count the lug holes first. On 4-, 6-, and 8-lug wheels, measure from the center of one hole straight across to the center of the opposite hole. On 5-lug wheels, measure from the center of one hole to the outer edge of the hole across from it. Put the lug count first, then the circle diameter second. That gives you a code like 5×114.3 or 6×139.7.

What The Bolt Pattern Numbers Mean

A bolt pattern has two parts. The first number is the lug count. The second number is the diameter of the circle those lugs form. You may also see that second number called the bolt circle or PCD, which stands for pitch circle diameter.

So if a wheel is marked 5×114.3, it has five lug holes spaced on a circle that measures 114.3 millimeters across. A 6×139.7 wheel has six holes on a 139.7 mm circle. Both numbers have to match the vehicle. Close is not good enough here.

• 4×100 = four lugs on a 100 mm circle
• 5×114.3 = five lugs on a 114.3 mm circle
• 6×139.7 = six lugs on a 139.7 mm circle
• 8×165.1 = eight lugs on a 165.1 mm circle

You’ll also run into inch-based versions on older fitment charts. That’s why 5×114.3 and 5×4.5 often show up side by side. They point to the same pattern, just in different units.

How To Measure Tire Bolt Pattern On Odd And Even Lug Counts

The measuring method changes with the lug count. Even-lug wheels are simple. Five-lug wheels need one extra step.

How To Measure 4-, 6-, And 8-Lug Wheels

These are the easy ones because each hole has another hole directly across from it. You can run a tape measure or caliper from center to center in a straight line.

1. Lay the wheel flat.
2. Pick one lug hole.
3. Measure from the center of that hole to the center of the hole across from it.
4. Write down the lug count and the diameter together.

If you’re measuring on the vehicle, use the center of the studs instead of the holes. A ruler can get you close. A caliper will give you a cleaner reading, which helps when two patterns sit near each other.

How To Measure 5-Lug Wheels

This is where people slip up. There is no hole directly across from the one you start from, so a straight center-to-center read won’t work.

Start at the center of one lug hole. Then measure to the far outer edge of the hole across from it. That outer edge stands in for the centerline you can’t measure straight through. Tire Rack’s bolt pattern measurement page shows this layout clearly.

A small miss can push you into the wrong code. A reading near 4.5 inches usually points to 114.3 mm. A reading near 4.72 inches points to 120 mm. Those two are close enough to fool a rushed tape measure.

Tools That Make The Job Easier

You do not need a fancy setup, though the right tool saves time.

• A tape measure works for a rough check.
• A ruler with clear millimeter marks helps with close patterns.
• A digital caliper gives the cleanest read.
• A bolt pattern gauge is handy if you swap wheels often.

Pattern Code	Read It As	Common Note
4×100	4 lugs on a 100 mm circle	Common on many small cars
4×114.3	4 lugs on a 114.3 mm circle	Also written as 4×4.5
5×100	5 lugs on a 100 mm circle	Used on many compact cars
5×114.3	5 lugs on a 114.3 mm circle	Also written as 5×4.5
5×115	5 lugs on a 115 mm circle	Close to 5×114.3, but not the same
5×120	5 lugs on a 120 mm circle	Seen on many BMW and GM fitments
6×139.7	6 lugs on a 139.7 mm circle	Also written as 6×5.5
8×165.1	8 lugs on a 165.1 mm circle	Also written as 8×6.5

Mistakes That Throw Off Your Measurement

The most common mistake is measuring edge to edge instead of center to center. That adds the hole width into the number and throws the result off. Another one is mixing inches and millimeters midway through the job.

Five-lug wheels cause the most confusion, though conversion can trip people up too. If your notes show 5×4.5 and the wheel listing shows 5×114.3, that’s the same pattern in two units. Discount Tire’s bolt pattern conversion chart lays out those inch-to-millimeter matches.

Dirt, rust, and rounded hole edges can also skew a reading. Wipe the mounting pad clean before you start. If you’re checking a used wheel, make sure the holes have not been wallowed out or damaged. A worn wheel can be harder to read and not worth reusing anyway.

Good Habits That Save You Trouble

Try these before you click buy:

• Measure twice if your first read lands near two close patterns.
• Use millimeters for your final note.
• Check one front wheel and one rear wheel on older custom builds.
• Match the wheel listing to the vehicle year, trim, and axle setup.

Bolt Pattern Is Only One Part Of Wheel Fit

A matching bolt pattern gets the wheel onto the studs. That does not mean the wheel is ready to run. You still need to match center bore, offset, width, brake clearance, and load rating.

This catches a lot of buyers. A wheel can share the right pattern and still hit the caliper, sit too far inboard, poke too far out, or need different lug hardware. That’s why seasoned installers never stop at the bolt pattern alone.

Here’s a clean order to follow when you’re checking wheel fit:

1. Confirm the bolt pattern.
2. Confirm center bore.
3. Check offset and wheel width.
4. Check brake and suspension clearance.
5. Match the seat type for the lug nuts or bolts.
6. Make sure the wheel load rating fits the vehicle.

If you’re shopping used wheels, ask for a photo of the back pad markings. Many cast or forged wheels have the bolt pattern, size, and offset stamped there. That can save you from guessing off a blurry ad title.

Fit Check	What To Verify	Why It Matters
Center Bore	Hub hole diameter	Keeps the wheel centered on the hub
Offset	Mount pad position	Changes inner and outer wheel placement
Width	Rim width in inches	Affects tire fit and clearance
Lug Hardware	Seat style and thread spec	Helps the wheel clamp the way it should
Load Rating	Wheel load capacity	Needs to match the vehicle’s needs

When A Direct Measurement Is Not Enough

Sometimes the wheel is off-brand, the finish hides the markings, or the vehicle has changed hands enough times that nobody knows what came stock. In that case, use more than one clue.

Check the stamping on the rear of the wheel. Check the vehicle placard or factory wheel spec sheet. Then compare your read with a trusted fitment catalog from a wheel seller that verifies applications by vehicle. If all three line up, you’re in good shape.

Be extra careful with older trucks, vintage cars, redrilled wheels, wheel adapters, and dual-drilled aftermarket wheels. Those setups can carry odd spacing, mixed hardware, or drilled patterns that look right until you set them on the hub.

On-Car Measuring Tips

If the wheel is still mounted, turn the steering a little so you can reach the studs more easily. A cloth tape can snake around the center cap area better than a stiff ruler. Still, if access is tight, pulling the wheel off will give you a cleaner read and save time.

Get The Pattern, Then Confirm The Full Fit

Measuring a bolt pattern is not hard once you know the layout. Count the lugs, use the right measuring points, write the code in millimeters, and double-check five-lug wheels with extra care. That gets you past the biggest hurdle in wheel shopping.

Then do the smart thing and check the rest of the fit. Bolt pattern gets the wheel onto the car. Center bore, offset, clearance, and hardware decide whether that wheel belongs there.