Bolt circle

[1] Other common uses for bolt circles are for indicating mounting for sim racing and real-world car steering wheels, or in the industry for mounting of servomotors or for specifying the bolt pattern of a flange.

[2] On steering wheels for cars utilizing bolt circles, this usually measures 6×70 mm.

[3] Servomotors in the industry are often mounted via a flange-like coupling to give the shortest possible leverage for high-torque uses.

[citation needed] The bolt circle of a car is one of several parameters that must be checked before buying new rims to make sure they will fit the car (along with wheel offset, hub diameter, and finally the diameter and width of the rim and tire).

Over the years, over 30 different bolt circles patterns have been used by car manufacturers,[7] most of which are not compatible with each other.