Put on my non inverted kingpins today. I'm no mechanic and don't have a clamp or anything so not sure if I did it correct but it was very easy with a hammer.
The kingpin is kinda free unless your truck is fully tightened down which could make switching bushings and tinkering a little trickier. Skating it feels good so far, didn't notice any loosening at all though that was never a big issue for me (until I accidentally stripped the inverted kingpin nut trying to adjust one time).
The nylock on the nut doesn't look great, no issues though and hoping that grinding on the kingpin/nut won't mess with it. I wanted to put a standard wheel axle nut on but they're a little shorter than the lurpiv nuts and having a standard nut flush would have made the trucks slightly wobbly loose, too loose for me and I hate having threads showing.
There is clearance, but less than with the inverted pins. Worse compared to my venture setup. I've grinded these trucks down a little bit, but shouldn't be enough to affect kingpin clearance, its been just over a month. Attached some pics (that are definitely affected by camera distortion) for clearance reference, stock lurpiv nut flush with non inverted kingpin:
Some other notes:
I've gone back primarily skating my venture setup. Despite the fact that these are more fun to skate, I skate the same 4 ledge spots 80% of the time, and my harder grinds/slides are just a bit more consistent on ventures. My slightly bigger lurpiv setup is now for when I skate more all round street, or curbs. I like the lurpivs more for slappies, something about the geometry makes getting into slappies a bit easier than on my ventures.
As you may be able to see in the pics, the pivot cup hole is starting to oval out from doing a lot of slides on rough concrete ledges and wearing out the baseplate. Probably not worth being concerned over as it happens pretty quickly on all my trucks, and I don't think I never notice it affecting anything, but if that happens to you and it bothers you then maybe something worth considering.
instagram.com/p/CY0BzaRvpx7/ came across this guy on ig who also seems to agree that the baseplate wears down kinda fast from nose/tailslides relative to the hanger.
The pinch is very good, slightly different to ventures but easily on par in my opinion. Found this a bit surprising since they're a turny, tall truck with a relatively shorter wb and I don't really like the pinch on indys or aces.
The non inverted kingpin will likely touch if you dip your smiths on rougher ledges. Though to be fair, even the inverted kingpin hung up on smiths on concrete ledges sometimes for me (somewhat aggressively since the metal is hard and the edges are very sharp). Normally this isn't the biggest problem with most trucks since the kingpin nut gets ground down at an angle and will stop catching but I'm not sure how thats going to work with the slightly smaller nut and the slightly exposed nylock. Time will tell I guess.
Still a great feeling truck that skates very good, even for someone who comes from very different trucks. There are definitely issues that you may possibly have to deal with, no dealbreakers for me but totally understand that for many they are. I'm sure future iterations will address them. I'm looking forward to it as I'd prefer these over indy/ace and probably even thunder any day.