Had em on a few different bikes. In all honesty pure vanity, think they look real nice on black bikes. Turbo cottons were my summer tires the past 2 years, didn’t really have a problem keeping them clean, even with riding in the rain, but I do think disc brakes helped here. Wife’s gravel bike has a set of WTB’s with tan walls that got a bit grubby, but a lot less than expected. I have had a set of Panaracer Pasela’s on my commuter that are black at this point, but truly could not care less there. The only place I explicitly chose tan walls was the Turbo Cottons, again for vanity. The others either came with the bike or were the cheaper option.