Hi Ed
The larger CMP trucks had a similar split rim BUT in 20 inches........ using a variety of 900x20 bar thread or Chevron tractor type in 10:50x20 ............ the axle ratio was altered from 6.5 to 7.1 to compensate for the tire size.......... so both the 16 inch and20 inch trucks basically travelled at the same speed using the same 216....... I am using a 1959 Chev 261 and it might pull in a few more miles per hour on the top end........ currently on 16 inch at 44 mph top speed I tend to use both hands on the steering and a very crisp hand with the thumbs out of the wheel spokes...... they are not really designed to operate at high speed and the safety margin goes downhill very quickly......brakes are good but require total rebuild andconstant maintenance/adjustment if you intend to lockup the wheels.
Cheers
