What are the parameters in the car wheel hub model size chart?

[OAustin]

Car wheel hub's main parameters include: 1. Wheel size: Composed of two parameters, rim diameter and rim width. Expressed as 156.5; 156.5JJ; 156.5J, etc., with no strict format requirement. The "15" indicates the rim diameter, meaning the wheel hub's rim diameter is 15 inches, while the "6.5" (or 6.5J, 6.5JJ) represents the rim width, indicating the wheel hub's rim width is 6.5 inches. 2. PCD: Refers to the pitch circle diameter of the wheel bolt holes. Expressed as 5114.3, 10*100/114.3, where "5" indicates the number of bolt holes, meaning there are 5 bolt holes. "114.3" means the pitch circle diameter of the bolt holes is 114.3mm. 3. Offset: The distance between the mounting surface and the wheel hub's centerline, usually found on the back of the wheel hub. The offset is used to adjust the track width and ensure the wheel does not interfere with the vehicle body. 4. Center bore: The large hole in the middle of the wheel hub. Note that the center bore size should be measured from the back for accurate data. If the wheel's axle hole is large, a hub centric ring must be used; otherwise, the wheel may wobble at high speeds. Aftermarket wheels generally have larger center bores to fit all vehicles, while original equipment wheels usually have smaller ones. Any gap should be filled with a hub centric ring.

[SanRiley]

There are quite a few key parameters in wheel hub model size charts. As an enthusiast who frequently helps friends change wheels, I know it's essential to pay attention to the bolt pattern (the number and spacing of bolt holes, like 4-lug or 5-lug, which varies by vehicle), center bore size (the diameter of the center hole, which must fit snugly over the axle hub), offset (the distance from the mounting surface to the centerline—positive or negative values affect whether the tire will rub against the body), wheel width (e.g., 7 inches, which determines tire width options), and wheel diameter (e.g., 15 to 18 inches, affecting sidewall height and overall handling). There's also material info like alloy or steel, but dimensions are the core. If these parameters don't match, the wheels may vibrate, wear out the suspension, or even compromise braking performance, especially at high speeds. I recommend checking the factory manual or using a mobile app to measure before swapping wheels—don't upgrade blindly just for looks. For daily driving, regularly checking the tightness of wheel bolts can prevent minor issues from becoming major ones.

[AlexisLynn]

From my personal experience with car modifications, wheel size specifications include bolt pattern (PCD value, e.g., 5x112 means 5 bolts spaced 112mm apart), center bore (diameter size, which must match the vehicle's hub), offset (measured in millimeters, positive offset makes the wheel sit more inward), width (usually measured in inches, like 8J meaning 8 inches wide), and diameter (e.g., 16-20 inches). Mismatched parameters can cause imbalance, increased noise, and even interfere with the ABS system. When measuring myself, I use calipers for bolt pattern, and the center bore must fit the hub ring. When upgrading wheels, width and offset are crucial: wider wheels with wider tires look better but consume more fuel, while negative offset makes the car sportier but wears tires faster. Remember to check wheel weight differences—alloy wheels are lighter but more expensive, steel wheels are heavier but more durable, with practicality being the priority for family cars.

[McJames]

As a seasoned driver with decades of experience, I believe that wheel size parameters such as PCD (number of holes plus spacing), center bore (hub diameter), offset (mounting deviation value), width, and diameter must prioritize safety. For example, an excessively large diameter can lead to inaccurate speedometer readings; incorrect offset may cause brake system overheating and failure. Parameter mismatches can result in unstable handling or tire blowout risks. For regular sedans, diameters of 15-17 inches and offsets of 40-60mm are common. During maintenance, regularly inspect wheels for rust or deformation, especially during rainy seasons when water accumulation can cause corrosion. When replacing wheels, ensure the new parts' parameters match the original factory specifications, and avoid buying cheap, inferior products.