The brand ENVE actually states this: avoid using ceramic bearings, as steel bearings offer better stability.
As for internal widths of 24mm and 25mm, they are indeed designed for 30mm tires. A 24mm internal width is highly compatible with 28mm tires, whereas for a 25mm internal width (32mm outer) , a 30mm tire might be the absolute minimum requirement.
Around 10-15 days, We will have a lot of 25mm inner 50mm depth in stock 20/24H
There are 5 set 20H 25mm inner for carbon spokes, with a better price. Weight of the rim 420g.
Contact me.