Im sure the wider tires would greatly affect the performance of the Half/Segway Half/Boom Box. It definately would go slower because of the great rotational mass added to the machine. It would probably use the batteries much quicker. Just imagine trying to turn it with those tires on the grass...
Im sure the owner doesnt care much about what it does to the Segway. From the looks of things, he has enough money to fix anything that would
break....
He either doesnt use if often or he cleans it well.