Lawn mowers like cars come with different equipment levels and engines. Some for example may have a grass box or side discharge, single or twin cylinder engines, wide triple blade decks or twin blade set-ups, all will affect the kerb weight.
Riding lawn mower weight comparison, so what's the average weight? A riding mower is heavy, the average weighs about 500 lbs.
Mowers fitted with plastic bodies offer significant weight advantages but can become brittle over time, especially if parked in direct sunlight. Steel bodied mowers are obviously heavier but will out live the plastic body.
Wheel weights are usually available as accessories for front and rear wheels, they're needed to help traction and to counterbalance a snow shovel or other implement fitted to the front or rear.
When buying a tractor you won't get any of these accessories as standard, all will be an add on option.