Lawn mowers with piano wheels

 

— wheels of a special design, also called "self-orienting". This name is due to the fact that the piano wheels are mounted on vertical rotary axles and can be turned in the direction of travel. This design is familiar to many from supermarket carts; however, unlike such carts in lawn mowers, only one pair of wheels, the front one, is usually swivel. However, even this design significantly increases the manoeuvrability of the unit and allows it to turn almost on the spot. So these models are indispensable when working in cramped conditions.