We are still tubers ! The subject comes up lots here in the UK as the Vredestein classic is a very popular tyre, radial but in bias/crossply sizes. You see it fitted to Jags, Triumphs, Lotus, Alfas - lots of stuff that original were bias/crossply. Answer from Vredestein and the tyre suppliers is if the wheel wasn't designed to be tubeless (so doesn't have a safety ridge) you have to fit a tube. We have had no problems with tubes, must be 10,000 miles now on Vredesteins. Had a puncture repair a few years (nail through tyre) and nothing scary inside. It is difficult to by quality tubes now though, have to be specially ordered, most tyre places only stock cheap Chinese rubbish. Saying that, always value Johns opinion, but we differ on this !!!!