The TT100 series tires were made in a trigonometric profile, i.e., a "V" shape to the tread. They stood taller than the OEM versions and were numbered differently: the standard TT100 front tire for the CB750 was 4.10x19, replacing the regular 3.25x19 round style cross-section. But, those tires haven't been made since 1996. They had incredible grip: I ran dual discs with mine for 48k miles before dry rot finally took it out in 1980. It still had good tread left, too! These were roadrace quality grip, and the rear tire came as the 5.10x18 to replace the 4.0x18 back there. These raised the bike about 3/4" over the regular Bridgestone tires these bikes originally shipped with (as if the bike wasn't tall enough?) and helped improve ground clearance when dragging boots.
"Ribbed" tires refer to the longitudinal shape of the tread, which is long, thin 'ribs' that run circumferentially around the tire. These ribs enhance straight-ahead stability at speed, but make the steering 'feel' a little heavier when cross-steering to enter a turn.
"Block" style is any tread pattern that cuts
across the body of the tread at 70-90 degrees of angle (diamond patterns are the limit of "block" style).
The siping-style treads (i.e. slashes toward the sides) we see so much of today are made for moving water away from the contact patch, letting it escape sideways out from under the contact patch area. I have NO idea what to call them,..and they don't hold the pavement like a TT100, either.
For general-purpose commuting and touring use, block-style rear carries heavier payloads better than non-blocked patterns and provides stability with heavy loads. Block-style front tires can induce steering head wobble (called "fanning the stops" back when) as the tread wears itself into sharp raised edges on the blocks. Bad idea for any front tire, and famous for making old British bikes hard to run on curvy roads. Rib patterns do the opposite here.
