surly old man
Join Date: Sep 2006
Location: Carlisle, PA
Bikes: IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
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I am pretty sure that all pneumatic tires made since about 1890 have been made of rubber. Some have different formulations to make them stickier or longer lasting. But they are all rubber. So, a newer tire will be made the same way a ten year old one will be.
If the only problem with your older tires is that the sidewalls have cracks, I would keep using them. Cracks on a car tire are bad news. On a bike tire it makes no difference. The rubber on the sidewall is essentially cosmetic, anyway.
If you wanted to change out for cosmetic reasons, then I think you will have no trouble finding a million options that would be just like the ones you have now.
Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...