Hub bore defines the void at the centre of the wheel. Wheels are manufactured in vast amounts, they are not made for the underlying vehicle in mind, thus hub rings are advised. Custom and aftermarket wheels are designed for a variety of vehicles that make them to suit a variety of vehicles. Hub rings mean the wheels and hubs go on perfect for each other.

Hub-centric wheels can be made by style, known as lug centric. Torque is a vital aspect of mounting the rim since it helps the lug nuts to center on the rim.

There are 3 categories:

• Hubcentric wheels are shaped by cutting the hub bore to the same diameter of the corresponding vehicle bore.
• Multi-application wheels are wider than standard wheels and are made with a range of uses in mind. To prevent damage to the drill bit, you can use a centering ring to minimize the size of the bore. (see image above) At Town Fair Tire, we sell a free collection of centering rings for every alloy wheel to ensure a comfortable factory journey.
• Centerbore Ring. The wheel is designed to use the lug nuts to center the wheel and not to rely on the axle or hub. The most famous example of a steel wheel is the Lug Centric Wheel.

The weight of the car is moved from the spigot, (the bit the center of the wheel that protrudes from the hub), to the center hole in the wheel. A wheel's wheel bolt or stud is built to keep the wheel in place. Therefore, it is important that the wheel bore suits the size of the hub hole located in the vehicle.

It is possible to change the size of the center bore with a spigot ring. How to do it, you can see at hubbore.com. Spigot rings can be bought on eBay for use on any center bore. Just works if the wheel's centre bore is wider than the spigot ring's. If the wheel's centre bore is too thin, so they can only be fitted by milling (ie boring out) which is so expensive that it makes it pretty inefficient.