I'm a big fan of Krawlers, and I have a number of short-wheelbase, tiny-tire rigs, so I was keen to get a set of these new Class 0 Krawlers when they came out.
They don't have a lot of sidewall height due to being 1.9's. I would have preferred them to be 1.55's, but I thought maybe with the right wheels and foams, they might not look too goofy. I tried them with a number of different foams and mounted them up on SSD Assasins in Bronze. I had hoped the black beadlock ring would make the wheel appear a bit smaller. I'm not sure that made much of a difference. Maybe if I swapped out the zinc-colored scale hardware on the beadlock rings to black hardware it might work better at masking the size of the wheel.
Here they are compared to a set of RC4WD BFG Krawlers on 1.7" steel wagon wheels. The difference here is fairly subtle, but I do prefer the look of the 1.7's. The smaller wheel/larger sidewall of the 1.7 RC4WD combo just appears more realistic to me.
Here are the Pro-Line Class 0 Krawlers on 1.9 SSD Assasins with three different bodies mocked up on an ECX Barrage chassis.
The conclusion I've come to is that as far as looks are concerned, it really depends on the body you are running. For me, the Class 0 Krawlers would be a no-go on any these smallish bodies. But I thought they looked pretty good on DJR01974's Enduro chassis with a Hilux body. So maybe they'll work on larger bodies or rigs with longer wheelbases.
I haven't had a chance to run these tires yet, but I got mine in Predator compound, and they are very soft and sticky. The included stock foams from Pro-Line are also very soft. Out of the four foam combos I tried, ironically, I found the stock foams from the RC4WD 1.7 Krawlers provided just the right amount of tire fill, conformity, and sidewall support.
So yeah, at least for me, these Class 0 Krawlers are a bit of a novelty. They might turn out to be awesome performers, but I think many people are primarily going after scale looks with these tiny tires - and being 1.9's kind of handicaps them in that department. On smaller bodies for sure, they do tend to make your rig look like a mall crawler. So for now, they are going back into the parts bin until I figure out where I can best use them.