How to choose correct wheel spacers/ adapters?

1. Check Your Vehicle/ Wheel Bolt Pattern/ PCD - 4x100mm

The bolt pattern of a wheel is the layout of the mounting holes. A wheel's bolt pattern can also be called its "Bolt Circle" or "Pitch Circle Diameter (PCD)".

Bolt pattern is expressed as the number of lugs by the diameter of the imaginary circle formed by the center of the lugs. For example, 5 x 4.5 in., or 4 x 100mm.

The bolt pattern MUST match the pattern on the axle hub. Even a slight difference will cause the wheel to be off-center. This will cause excessive vibration while driving.

2. Check Vehicle Hub Bore Size - 54.1mm

Measure the diameter of the center bore, make sure the spacer's diameter is the same as the axle diameter.

3. Check Vehicle Thread Pitch - 12x1.5

There are different types of studs, sunch as M14X1.5, M12X1.5, 1/2"x20, 9/16"x18, please make sure the studs of wheel spacers is the same as the vehicle's, otherwise the spacer will not fit.

4. Measure the fender gap to choose suitable thickness. - 20mm

The thickness of spacer you need will vary depending on the individual vehicles you’ve performed, determining that correct thickness is extremely important.
Measuring the wheel gap is the most basic beginning. The wheel gap is the amount of space between the inner fender lip and the outside edge of your wheel tires or rims.

1. Preparing two rulers, take one ruler in each hand, set one flat against the inner fender lip hanging down as straight as possible. Measure the distance from the tire or rim edge to the hanging ruler. This distance is the amount of room you have till you would have contact. You will want to get a spacer smaller than this number.
2. If you have a straight edge metal ruler, place the straight edge on the outermost part of the rims where the wheel comes closest to the fender (preferably the top), then, measure from the outside wheel to the straight edge. This distance is the size spacer you will need to achieve the look that flushes or nearly flushes with the fender.

Every car’s wheel gap is various, even if they the same exact cars, the wheel gap of the front wheel and the rear wheel is different. Always measure first before buying wheel spacers. Too thin, you will still have wheel/caliper interference. Too thick, the wheel rims or tires will hit the fenders. The proper thickness will give you the brake clearance and wheel offset you need while avoiding fender rub as well as breaking local laws and regulations.

Note: For 1 inch or less or special adapters, if the stock studs are longer than the adapters, and the wheels do not have hollow spot in them, you may need to grind, or cut your existing lugs if you don't choose to purchase shorter studs.

The main reason for vibration from wheel spacers

In fact ,wheel spacers in themselves don’t cause vibration,they are just increasing the cars sensitivity to a pre-existing problem.Wheel spacers could be magnifying an existing imbalance or out-of-round condition in tires. Also, this may be incompatible with the natural frequency of the front control arm bushings. Most likely, though, is an amplified pre-existing problem.Anyway,a few causes lead to vibration.

1.Sometimes wheel weights get knocked off or lost when pulling wheels on/off the car.
2.If the wheels were out of balance, the spacers would magnify the effect.
3.Its possible that the wheels didn't seat correctly on the hubs. Lowering the car more than was necessary to keep the wheel from turning.

How to fix the problem ?

1. Firstly, getting rid of the problem of wheel spacers themselves and making sure everything was mating up correctly.

For example,wheel bore should match the hub.When the wheel is in the air, give it a spin and check for any misalignment/wobble/etc.Both the face of the wheel hub and the back of the wheel spacers are clean,no rust or corrosion. Maybe it is just a small burr on one surface.Make sure wheel bolts are long enough and are torqued and retorqued after a few miles.After check it,pls try to remove them and re-install.

2. Rebalance or correct an out of round condition of your tires

Following the above step,removed everything, cleaned/inspected for any small dents/gashes in the wheels/hubs/spacers, put everything back together and torqued the bolts in a star pattern with only a bit of weight on the wheels but it’s still vibrating.Then it’s certainly the vibration wasn’t caused by wheel spacers but there is an existing imbalance or out of round in a tire of your car.Then you need to go for a rebalance.Finding a technician that actually understands how the tire balance works. Most better shops can handle this. Just go in and ask if the technician knows how to overide the automatic zero or whatever its called. Expect to pay extra for the additional time it will take.If the tire may be out of round, in which case a small amount of shaving will be necessary. If you find a shop that can correct an out of round condition, we’ll assume they also understand balancing to less than 1/8 oz.And the problem is now almost gone.

3. Very smooth roads don't cause any vibration.

After rebalance or correct an out of round condition of your tires,any vibration left its entirely road induced.Very smooth roads don't cause any vibration.