You tell my why they should not certificate their rims fit for road use it's standard practice for safety related car parts. And if someone is selling their gear on here they should have the balls to either state they are fit for purpose (road use) or they are for show use.You mean just get on with life? I think we've deduced that you're not going to get this certificate thing you want from anyone on a public forum and to be honest, why should you. The numbers of banded steels sold vs failure rate by the likes of Colese etc speaks for itself. Since Colese is the only active person on here that does banded steels, I suggest you contact the following directly in your quest:
Banded Steels Essex
Duchy Banded Steels
And just remember before having a pop at me it was you who dragged this subject back up with your little dig at me.