The centre bore is the size of the hole in the centre of the wheel where the spigot fits through. The centre bore, (also known as spigot size), is the diameter of this hole, usually measured in millimetres.
Many owners often feel vibrations when driving over 40 mph. Basically, one would blame the wrong wheels or consider the problems with the steering. However, there is a chance you have just installed a larger than needed center bore. To avoid such vibrations you don’t need to buy new wheels. It will suffice to use a special tool. But in the first instance, let’s talk about the center bore.
To understand what a center bore is, look at the wheel's backside. Here in the rim center, you can see a center bore which essentially comes through the vehicle hub. Car’s hub goes into this hole and centers correctly, placing the vehicle load proportionally among the wheel part. That's why you should find the wheels which match adequately the center bore. The original wheels have the best center bore, while at the aftermarket, there are so many possible sizes to fit using the centering rings.
These devices adapt one-type wheel to different hubs and make the fitting tighter. Most aftermarket makers produce the wheels with enough optimal bores in order to match various vehicle hubs. So, they can sell more wheels for various vehicles.
Speaking of center bore we have to mention that it is not always the real wheel center. Wheels can be hub centric and lug centric. Most customers purchase hub centric parts in the design. Their center hole and an actual center bore coincide. These wheels provide proper mounting and are accurately balanced. The other wheel type is lug-centric. Their name expresses that the load falls on the lug nuts. The center hole doesn’t perform its real function. That’s why they can’t center using the normal balancing system.
These centric rings can’t help you with this issue. You should balance them through the lug bolt pattern.
The manufacturers usually make their centering rings from plastic. Many people think that plastic is no good because it’s cheap and it may break. The main advantage of such rings is that they are cheaper and have a wide range of sizes. There are the cases then you can use them. You may purchase plastic rings if you drive a light motor vehicle or family cars.
The parts don’t match the high-performance vehicles because of damaging risk. Here you could use aluminum ones to prevent from cracking and breaking. Metal ones can withstand high temperatures and rough conditions.
Riding too much time with vibrations and unfitted center bore can damage your lug nuts and bolts. You may even lose them or the full wheel while driving. In addition, don’t forget to check your wheels and see if you have this problem, purchase a set of wheel centric rings.