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Basic parameters of wheel hub
Release time:
2024-07-29
The size of the wheel hub is actually the diameter of the wheel hub. We often hear people say things like 15 inch wheels and 16 inch wheels, where 15 and 16 inches refer to the size (diameter) of the wheel hub.
size
The size of the wheel hub is actually the diameter of the wheel hub. We often hear people say things like 15 inch wheels and 16 inch wheels, where 15 and 16 inches refer to the size (diameter) of the wheel hub. Generally, in sedans, if the wheel hub size is large and the tire flatness ratio is high, it can visually provide good tension effect and increase the stability of vehicle handling. However, this comes with additional problems such as increased fuel consumption.
width
The width of the wheel hub, also known as the J value, directly affects the selection of tires. For tires of the same size, different J values result in different tire flatness ratios and widths.
PCD and hole position
The professional name of PCD is pitch circle diameter, which refers to the diameter between the fixed bolts in the center of the wheel hub. Generally, most wheel hubs have 5 or 4 bolts, and the distance between the bolts varies. Therefore, we often hear the names 4X103, 5X114.3, and 5X112. Taking 5X114.3 as an example, it represents that the PCD of this wheel hub is 114.3mm with 5 bolts in each hole. When choosing wheels, PCD is one of the most important parameters. For safety and stability considerations, it is best to choose wheels with PCD consistent with the original vehicle for upgrading and modification.
Offset distance
Offset, commonly known as ET value, is the distance between the fixing surface of the wheel hub bolt and the geometric centerline (the centerline of the wheel hub cross-section). Simply put, it is the difference between the center screw fixing seat of the wheel hub and the center point of the entire wheel hub. Simply put, it refers to whether the wheel hub is recessed inward or protruding outward after modification. For general sedans, the ET value is positive, while for a few vehicles and some jeeps, it is negative. For example, if the offset value of a car is 40, if the ET45 wheels are replaced, they will visually shrink into the wheel arch more than the original wheels. Of course, the ET value not only affects visual changes, but it is also related to the steering characteristics and wheel alignment angle of the vehicle. A large deviation value may cause abnormal tire wear, easy bearing wear, and even impossible installation (the brake system and wheel hub cannot rotate normally due to friction). In most cases, the same brand and style of wheel hub will provide different ET values to choose from. Before modification, comprehensive factors should be considered. The safest situation is to maintain the ET value of the modified wheel hub the same as the original factory ET value without modifying the brake system.
Central hole
The center hole is the part used to fixedly connect with the vehicle, which is the position of the center of the wheel hub and the concentric circle of the wheel hub. The diameter size here affects whether we can ensure that the geometric center of the wheel hub can match the geometric center of the wheel hub when installing the wheel hub (although the wheel hub positioner can convert the hole distance, this modification carries risks, and netizens need to try it carefully).
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