The chassis configuration is a formula that gives information about the wheels of a road vehicle including number of wheels, number of driven wheels and number of steered wheels.
with: Basis is always the standard configuration, meaning a steered front axle and a non-steered driven rear axle.
This means: If only the front wheels are steered, the rearmost part of the formula can be left out.
Even if the information contained by C is needless, it means that only front axles are steered.
This can give information about the distribution of axles.