Never seen steel tubular rims?

Anyway, if the glue is dry (not tacky) I start with a wire-wheel in a bench grinder. Just hold the rim up in line with wheel and use modest pressure working your way around the rim.

This will sometimes leave a perfectly clean surface if there are not too many layers of old glue. But if there's layers left that are not dry and brittle you can then use chemicals and a scraper to deal with that.

Paint stripper at worst but try naptha or similar first.