The largest available tire to fit the stock 8 inch rim is 16.6 inches diameter. ( Carlisle XTRAC ) and 4.7 inches inflated tire width on stock rims for said tire. What are some diameters of 10 inch wheel and tire combos so I can get an idea of how much additional clearance needed. Smallest and largest where the inflated tire width does not exceed five inches. I assume the inflated width of 10 inch tires on the 2.5 inch wide rims is going to be less. I see on EBAY two sources of the 10x2.50 rims at about $75 each including shipping. There are no other easy choices or sources of 10 inch tires are there ? I define easy as not needing to change drum hubs to disk hubs and change out the rest of the brake system for disk operation. As far as weight goes....Is it likely that narrower 10 inch aluminum wheelsets with tires are lighter than steel 8 inch stock wheelsets ? !2 inch tires are beautiful but it seems they cannot be used on drum brake systems. and require swap of front forks and hubs for disk brakes. Is that correct?