they look perfect!
same idea as the cool blocks.
i have had a saw in the past, that had those sideways back bearing. personally i didnt like them- i prefer if the blade is going to touch- that it touches the roller face- not the side. but i am not an engineer so who knows.
problem i found with the side on bearings, was that you have to be really careful where the blade may contact the side face- too close to center and the bearing wont spin, and the blade will cut into the bearing pronto!
But, having said that, there should always be about 1/4" to 3/8" between the back of the band and the bearing, especially on bigger bandsaws, with wider bands, on skinny bands and smaller height bandsaws, that gap should be a lot smaller.
Ideally with normal cutting, and normal feedrate- the band should just be clearing, and just not touching the back bearing.
the back bearing is there to prevent the band from stretching backwards- and breaking the blade. too much pressure against the back bearing, will cause the band to flip, or tilt one way or the other- causing your cut to go crooked.
so its all a balancing act between a sharp blade- that hardly flexes at all, a slower feedrate, big enough toothspacing, to give adequate chip clearance, (but still ensure a nice finish), and as the blade gets dull, you have to slow the feedrate down, i really watch that back bearing, thats the tell tale for me, besides a " feel" and the sound of the blade getting duller, and the feedrate needing to be adjusted ( same as when you go to a bigger piece of wood and a deeper cut) but if the blade is going to touch the back bearing, then i missed something in my "feel" i need to pay attention, or sharpen the blade etc.
but its also horses for courses, we can make a 10- 12 " deep cut by 4' long in under 30 seconds, and i am still not happy with that rate- i am going to double the hp on the big saw to improve that.
when we cut Sitka spruce, as soft as it is, sawyers and bladesmiths will tell you, its so tough and fibrous, that you actually have to treat it like a hardwood. tooth hook angle and feedrate as if cutting hardwoods.
if i cut D. Fir, i can get at least a 30% increase in feed speed.
our biggest issue, is that the blade slows down then the chips dont clear fast enough, and that slows the blade more, an ever descending spiral.
i only draw comparisons to the commercial side of band saw application, just to offer a comparison. i never expect my hobby saw to perform the same, its a lot more finnicky- but the knowledge from the bigger saws- really helps with the smaller saws, and visa - versa.