I was down in Laguna and took some pictures of this reputed 38,000 lb behemoth.
My guess is the wheel diameter is 66”-72”. Curiously the height capacity between
the guide blocks is only about 14”, so the saw must have been used in a different
setup for initial slabbing of logs, or a different saw was used for the rough work
with the big trees and this saw was used for cutting dimensioned beams.
The upper guide is not adjustable, but it does appear to be removable so conceivably
there might have been another, higher guide arm allowing the saw to handle cuts
of 30” in height or more.