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Wheel modification upgrade main reference data


1 wheel modification

Wheel modification refers to the modification of the original wheel of the vehicle by the owner or a person specialized in vehicle modification in order to achieve aesthetic or other purposes. It is generally a modification for aesthetics. At the same time, wheel modification is one of the most important modifications in vehicle modification.


2 wheel modification and upgrade knowledge

There are many different styles of aluminum rings on the market, which are really dazzling, but there are many points to be aware of when replacing the aluminum ring. From the most obvious appearance, although it is easy, the difference of the aluminum circle is not only in the shape, but the most important neglected original factory setting is the most important part.

Rim offset (offset value):

This value is the value of the center of the rim cross section to the fixed reference plane of the screw hole. It is positive for the general RV and negative for a few vehicles and some Jeep. For example, the offset value of a car is ET40. The aluminum ring of the ET45 will be retracted into the wheel arch than the original wheel-modified photo album (19 sheets). This design is related to the steering characteristics of the vehicle and the angle of the wheel. The original set value is usually optimized. The excessive offset value may lead to abnormal tire wear, easy bearing wear and even high-speed puncture. Loss of control and other side effects, can not be careless!

PCD value and hole position:

The hole position refers to the number of lock nuts when the rim is fixed, generally 4 holes or 5 holes. The PCD value is the diameter of the circle formed by joining the holes, so some holes may be drilled with 8 holes, which are prepared to accommodate two different PCD values.

Diameter and number of J:

This item is also related to the appearance. It usually goes up one level (for example, 14 to 15), which does not hinder the original acceleration. On the contrary, if the control, road surface and appearance visual effects are skipped, it needs to be considered. Although it is better in some respects, because of the increase in rolling quality, acceleration of heavy towing, fuel consumption, and reduced comfort, the cost of tire replacement must be carefully considered. On the other hand, if only the aluminum ring is changed and the number of holes is not upgraded, it is obviously helpful for acceleration. The J number represents the number of inches of the rim width. Generally, the original iron ring J number (5.5J) is used directly to match the tire after the tire width is upgraded. Most of the tires are insufficient, so if the aluminum ring is selected, if there is a wide tire Intention, you must first select a rim with a large J number (such as 6.5J, 7J) to avoid the dilemma of wearing big shoes in the future.


In addition to the above, when replacing the aluminum ring, it should be determined whether the quality is reliable. It is best to have a quality certified product to avoid the safety of the aluminum ring due to its poor quality.

Electroplating wheels are also divided into electroplating silver, water plating and pure plating.
Although the electroplated silver and water-plated wheels are bright and vivid, they are kept for a short time, so the price is low. The color of the purely plated wheel stays for a long time, with high quality and high price. Mid-to-high-end cars such as Guangben and Audi have chosen purely electroplated wheels for higher prices.


3 modified wheel hub main parameters:

Rim width:

Usually expressed in 5.5J, 6J, 7J, the unit is inch. Usually, the tire with the tire frame 185 requires a 5-inch rim width, 195 requires 6 inches, 205 requires 6.5 inches, and the 215 tire width needs to correspond to 7 inches wide. The rim.

Rim diameter:

There are 12, 13, 14, 15 and other specifications, the unit is inch, the current commercial vehicles have been equipped with 20 inch wheels, such as Infiniti FX35, BMW X5 and so on.

PCD value:

That is, the diameter of the circle formed by the tire screws is in mm, the domestic cars are usually 100, 114.3, and the European cars are special, including 98 for the Express train, 108 for the Volvo, 120 for the BMW, and 112 for the M.Benz.

Center hole:

It is used to ensure that the geometric center of the rim can match the geometric center of the hub, so that the steering wheel will not shake when the vehicle is driving at high speed.

Geometric centerline:

The most important reference data for the rim, including the calculation of the Offset value, the net distance to the fender, etc., must be referenced to this value.


The distance between the fixed surface of the hub and the geometric centerline, its most important role is to ensure that the tire does not wear to the body.

Rim wall:

Used to support the tire tread and absorb impact from the road surface.

Rim shoulder:

Tightly bonded to the tire bead to provide good air tightness to establish tire pressure.

Wheel surface:

Some of the rim's claws will protrude beyond the vertical line of the dish, so the rim will not be protected by the tire, and a slight accidental parking may damage the circle surface.

X distance:

Modification of multi-piston calipers must be considered data, otherwise there may be friction between the rim disk surface and the brake caliper.

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