My coupe's Riversides are pretty much shot. Good tread, but the sidewalls have extensive circumferential cracking. Car was in the Mojave most of its life, before I trailered it east in Sept. The downside of being in the SoCal desert is the UV and ozone which play hell with rubber parts. Of course the upside is having an 83-year-old car in NY that hasn't got a speck of rust anywhere! (It really is astounding to any local who looks it over). Wish I could say the same for my Hudson - if it weren't for THREE layers of floor mats, I could look down & watch the road go by!
Anyway, I'll probably have to replace the tires soon, if I want to do any touring. I've no idea what the tubes are like.
However, the same person who had the coupe also had a 1922 Dodge touring car, and when he dismounted the (original) "Non-Skid" tires he found original red rubber inner tubes, still functional. Car only had a couple thousand miles on the odo. It had belonged to a rancher out in Hell's half acre, NV and had the rear half removed and stored; it was being used to haul hay bales out to the south 40. The rear seat sat under a pile of straw in a barn and still had the original leather in fairly good shape.