Profiles (or similar 48spline cranks) have a 19mm axle, Primo's 22mm.
19mm axle leaves room for bigger bearings.
I ran Powerbites on my USA bb bmx frame but def prefer 19mm axle when i'm using a euro.
that is correct
however i have witnessed nuff profile cranks snap at the welds, and profile axle splines get stripped.
only one set of primo's i've seen damaged, that's me pal who cracked both arms in between the pinch bolts (i suspect overtightening but it could just be inevitable aluminium fatigue). bearing in mind he's had them for over ten years though
but if bearing longevity is your main concern, obviously bigger bearings is the way to go.
that is correct
however i have witnessed nuff profile cranks snap at the welds, and profile axle splines get stripped.
only one set of primo's i've seen damaged, that's me pal who cracked both arms in between the pinch bolts (i suspect overtightening but it could just be inevitable aluminium fatigue). bearing in mind he's had them for over ten years though
but if bearing longevity is your main concern, obviously bigger bearings is the way to go.