The railroad wheels below have been used in many applications: railbikes of many guys designs, they are so strong, they are being used in several Nuclear Power Plants to guide the containment covers.  So far - so good, let me know if that doesn't work.  I did not supply wheels to Chernobyl or 3 Mile Island. 
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6" round flange
 
inside riding surface is 2 1/2" wide

Two different flange angles,
one for the "dirty" side of the rail

$105.00
        














6” round at the flange end

 riding surface is 4”

$95.00
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   Shipping information, two wheels in a box.....

10” X 7” X 7”  -  6-1/2 Pounds 		    
contact
railrider@ne.rr.com