IIRC, there were solid wheels in specific applications (cannons on ships, for example) hundreds of years later.
Not sure if that speaks to which came first, but the existance of one would not infer total replacement of the other.
10 posted on 12/10/2007 12:41:41 PM PST by chrisser
(Sometimes it’s hard to tell the difference between “conservation” and the neutron bomb.”- Mark Steyn)