When I did my first restoration on a Murray Missile in the mid '90s, I HAD to have whitewalls. They were just so classy! These days there are very few bikes I'd put whitewalls on. They just have to fit the overall vibe. For example my '62 and '63 Typhoons. Both came with white enamel rims. With a whitewall, half of the tire gets 'lost' in the color of the rim. Not enough contrast (for me anyway) so they both got blackwalls. For a chrome rim or painted rim other than white, a whitewall looks cool. As far as muscle era bikes go, it's blackwalls all the way unless they're a raised white letter. I LOVE me a Huffy Cheater slick with RWLs!