You can also try removing a bit of material from the bore of the wheel as well. I just went through the same thing while reinstalling the lower wheel on my Delta 14" bandsaw. Slow progress with sandpaper and lube got the job done. I think it should slide in.
Try some light sandpaper on the shaft to get any burrs out, and also some sort of lubricant (I used a dry ptfe lube from WD-40) on the shaft to help slide it on.
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Just a bit more info on that lower bearing. It's called an Integral Shaft bearing or more traditionally a water pump style bearing. They come from the factory with the shaft.
https://www.fastenal.com/products/details/4126807
I had to replace one on my Delta contractors saw, and ended up having...
I don't know what the measurements are for that particular bearing, but I found a similar one for my '65 Delta contractor saw here:
https://www.fastenal.com/products/details/4126807
I ended up having to take it to a machine shop to replicate all the features on it, which turned out to be a bit...