Engineering:Centerlock wheels
From HandWiki
A centerlock wheel is a type of wheel in which there is one bolt in the center of the rim, instead of the more common 5 bolts around the center of the rim.
Mechanism
Most centerlock wheels consist of one "centerlock adapter" placed behind the rim, followed by a locking nut placed in front of the rim and a safety cap.[1]
Use in vehicles
There are several vehicles that use centerlock wheels.
References