I tried looking up specs on that likely Yamaha hub to get a better idea on diameter, but didn’t find anything online.
A Borrani with 4402 pattern is correct for an Aermacchi hub and even those won’t lace up cleanly to a Ducati hub. It’s close, but Spoke/nipple agreement will still be fouled as he described. I know because I laced up a a pair on my 450 Desmo and they were never quite right. Yesterday I got another correct Borrani 18/38 4647 for my 350 Desmo project and it’s drilled for a perfect as I described. Very cool.
The Spanish Mototrans Ventos (Ducati) bikes all came with correctly drilled Akronts. But they used larger diameter spokes & nipples so don’t interchange as well. Some Husqvarna bikes came with Akront rear wheels that were properly drilled for these similar diameter full width grimeca hubs but they’re usually WM3 and too wide for the front of an Aermacchi like this. They also have extra holes for rim locks that need to be welded up to look right on a street bike.
I think that Yamaha hub is slightly larger than a Ducati/Grimeca hub. If you slop the holes enough, that akront might work but it a bummer to wallow out an incorrectly drilled rim. The rim he removed wasn’t drilled wrong as he said. It was just punched/drilled for a different application before someone tried to install it on that hub. It was also a WM0 or maybe an WM1, so much more narrow than the Akront WM2 he’s going to try to install. That also matters in terms of hole position and angle.
He’ll figure it out.
