kew, I think some people like to let the mower steer them, and others like to steer the mower. If you steer the mower, your tyres will go bald after a while, and it won't matter because all it does is make it easier to steer. However if you are a "follow the mower" operator, your own tyres won't go bald, but if you borrow or acquire a mower with bald tyres it will be annoying because the mower will meander around a bit. (Personally I steer the mower.)