What is 6x139 bolt pattern?
It means six lug holes arranged on a circle with a diameter of 139.7 millimeters (about 5.5 inches).
In practice, the 6x139.7 pattern is a common specification used to describe the spacing and count of wheel studs. It is typically written as 6x139.7 mm or 6x5.5 inches and matters when you’re choosing compatible wheels, adapters, or replacements for a vehicle’s hub.
What the 6x139 bolt pattern represents
Numbers and what they indicate
The first number (6) is the count of lug holes, i.e., how many studs the wheel hub accepts. The second number (139.7) is the pitch circle diameter (PCD) in millimeters—the diameter of the imaginary circle that passes through the centers of all the lug holes. In common shorthand, this is also referred to as 6x139.7 or 6x5.5 inches. A match must be exact or wheel installation can be unsafe or impossible.
Where you’ll see this pattern
Common applications
The 6x139.7 bolt pattern is widely used on many heavy-duty pickups and SUVs across various manufacturers. Because it’s one of the more common six-lug configurations, it appears on a broad range of older and some newer trucks and SUVs, as well as many aftermarket wheel offerings. Always verify the exact pattern for your vehicle and the wheels you’re considering, since there can be variations within model lines and production years.
- Used on a variety of heavy-duty light trucks and sport-utility vehicles across several brands
- Popular in the aftermarket for 6-lug wheels and off-road setups
Confirming the correct bolt pattern is essential before purchasing wheels to avoid fitment issues or safety concerns.
How to measure and verify a 6x139.7 bolt pattern
Below are practical steps to determine whether your wheel and hub match the 6x139.7 pattern.
- Count lug holes to confirm there are six slots or studs.
- Measure the bolt circle diameter (PCD) by measuring center-to-center across opposite lug holes. The measurement should be close to 139.7 millimeters (approximately 5.50 inches).
- Check the hub bore size—the hole at the center of the wheel that fits over the hub. A mismatched bore can cause vibration or improper seating; you may need hub-centric rings or a different wheel.
- Verify lug nut size and thread pitch for compatibility with your wheel and hub studs.
With these checks, you can confidently determine compatibility and avoid wheel-fit mistakes. If you’re unsure, consult your vehicle’s manufacturer specifications or a trusted wheel and tire professional.
Practical considerations for 6x139 wheels
Center bore and hub-centric issues
Many wheels marketed for the 6x139 pattern are hub-centric, meaning they require a specific hub bore size to center the wheel precisely. If the wheel’s center bore is larger than the vehicle’s hub bore, you may need hub-centric rings for proper alignment. If it’s smaller, the wheel may not fit at all without modification.
Lug nuts, torque, and clearance
Ensure the lug nut size and thread pitch match the vehicle’s studs, and follow the manufacturer’s torque specs to prevent loosening or damage. Also verify brake caliper clearance and overall wheel offset and backspacing to avoid rubbing or clearance issues.
Summary
The 6x139 bolt pattern denotes six lug holes arranged on a circle with a diameter of 139.7 millimeters (about 5.5 inches). It is a common configuration in many heavy-duty trucks and SUVs, making it a staple in the aftermarket for wheel replacements and upgrades. Always confirm both the bolt pattern and hub bore, and consider lug nut size and wheel offset to ensure safe, proper fitment. When in doubt, reference the vehicle’s specifications or seek expert guidance to choose wheels that align with your vehicle’s design and performance requirements.
