What is a Centerbore?

What is a Centerbore?

The centerbore of a wheel is the size of the machined hole on the back of the wheel that centers the wheel properly on the hub of the vehicle. Centerbores on wheels are typically a standard size in mm. Hub sizes vary by vehicle brand and UTV/ATV model.

The centerbore (or commonly called hub-bore) of a wheel is the machined opening on the back of the wheel that centers the wheel properly on the hub of a vehicle. This hole is machined to exactly match the hub so the wheels are precisely positioned as the lug hardware is torqued down. Keeping the wheel precisely centered on the hub when it is mounted will minimize the chance of a vibration. Some wheels are vehicle model specific and will come from the factory with a bore machined to match that vehicle. Some wheels are designed to fit multiple vehicle models (like our V02 dual-drill UTV Wheel) to maximize a single wheel with multiple bolt patterns.

Wheel Example Below: V01 15x7 4x156

Polaris is notorious for having the largest hub assembly in the powersports industry, and thus requiring a very large centerbore measurement. For comparison, the Polaris 4x156 bolt pattern requires a 132mm (5.20") centerbore, while a Honda 4x110 bolt pattern requires a 86mm (3.38") centerbore. In the image below, there are two highlighted sections for reference. The blue area is the cap and the pink area is the centerbore. The centerbore of a wheel is machined during the manfacturing per the bolt pattern requirements so each Valor Offroad wheel is specifically engineered to work for your make/model of UTV or ATV. 

utv wheel centerbore measurement
In the image below we reference a common Polaris hub assembly used on all Ranger, RZR, Sportsman models. As you can see on the pink highlighted area, this extremely tall hub needs plenty of room to fit within the rear of the wheel to ensure proper seating and fitment. The centerbore of each Valor Offroad wheel is meticulously machined out to accommodate the hub assembly shown in pink on image.
how to measure hub assembly on polaris rzr centerbore
Hub Assembly Polaris centerbore utv wheels
how to measure utv wheel centerbore

Valor centerbore specs:

Bolt Pattern Centerbore
4x110 86mm
4x137 112mm
4x156 132mm

It is critical to torque the lug hardware with the vehicle on jack stands, off the ground. This allows the nuts or bolts to center the wheel and torque down without the weight of the vehicle pushing them off center.

View full valor offroad spec list here 


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