wheels not round??

[Monkeysmate]

Here's a daft one for you... i've recently removed a pile of old tyres from the rims, and i've noticed that the rims are not very round. I guess it's particularly noticeable when I mounted bare rims on an axle and gave them a spin.

Has anyone else noticed this? Should they sort themselves out when they get tyres on and a bit of load on them?

Thanks.