Thank you for the response. I was banking on assuming the official type of bearing would be stamped/printed on the side of the bearings within the hub, at which point if I ever need to upgrade, I can take one of those to a shop and see if I can get the exact same ones. I know at that point I'd also see how many bearings the hub rode on, but I didn't want to dismember the bearings from the hub just to see what's up. I'd rather leave everything intact until I NEED to do replacements.

I find it pretty interesting that a front wheel rides entirely on two of those bearings. With them being smaller bearings, do they tend to wear out quicker than standard open ball bearings that other hubs (namely 9mm) tend to have?

And yes - I am converting, but I'm not converting hubs... I just bought a new wheel all together that has a 20mm hub, whereas the fork I just purchased is also 20mm QR thru axle.