It’s most definitely between 38mm & 40mm radius bolt hole, 5 holes. I only have a hub w/me right now & no shaft to put thru it’s bearings to zero the caliper off of.
I very much believe it is 39mm bolt hole radius tho, from top down visual.
To validate top down visual
Hub OD is 105.5mm-105mm (tire currently on, lol)
Hub edge to hex thru-hole edge vertice is 10mm
Hex thru-hole vertice to vertice is 7.6mm-7.5mm, appears to be 7.5mm, ÷ 2 is where our bolt hole radius lies
(105.5mm/2) - 10mm - (7.5mm/2) = 39mm
Sorry for the wishy washy, don’t have best tool setup right now. Hopefully somebody has a known accurate file to confirm…
As long as this is correct, which it appears to be, it is indeed 75.75mm bolt circle, as best as injections molded parts can be measured. I find it slightly odd that it’s not 78mm. If I had to guess, I’d say 78mm is the upper tolerance bound & there’s some allotted shrink from the molding process.
It can’t be correct, because you could make the holes any size you want and it would change the measurement, despite the holes being in the same exact places.
Popped open SOLIDWORKS for the first time in forever, checking against some things
I’m braindead right now but it should have to do with the tolerance of the screw hole against the screw. If it’s a close fit tolerance to the screw, essentially OD of the screw threads, then it should be equivalent. If the hole is much larger than the screw shaft/threads, then obviously it’s incorrect.
