Nova Swiveling Bath Transfer Seat

I purchased the first set in Oct. 2013. They do not need replaced yet, they still have good tread. I figure I have another year or more in them. I have camber angle in my wheels so I need to take them off the rim and re-mount them, but they wear well, not enough wear to hurry and rotate them. I had the extra money so I purchased another set this Jan. 2016, to have them. These are a REALLY good tire and Sportaid is a really good merchant. I purchased the 'Heavy Duty Wheelchair Tube with the Schrader Valve' here. Before I purchased the schwallbe tubes elsewhere and had to replace one with the Heavy Duty tubes sold here.