How to Choose Your BMW 540i Lug Bolts?
Wheel lug bolts are designed to ‘stretch’ a certain amount when torqued to the manufacturer-specified spec. This stretch allows the bolts to make a strong mechanical connection to the threads on the vehicle hub. Common seat types of bolts include conical seat, ball seat, flat seat, etc. If you use current wheels and would like to upgrade to higher performance bolts, just keep the same lug seat. If you get aftermarket wheels, make sure you have lug bolts that will fit properly. Once you know which type of lug bolt you need, always be sure to have the correct thread pitch and wheel torque specifications. Otherwise, the bolts may not be able to properly secure the wheel to the vehicle hub.