Not sure about you, but I have a cupboard full of old bike tyres. Rather than chuck them away, maybe you can recycle them into, well, something useful – like a belt. http://www.wikihow.com/Make-a-Tire-Tread-Belt
I’m all for extracting full value from your cycling dollars, but the owner of these tyres must be (a) tight as, or (b) stupid as.
23mm? 25mm? Or how about these bad boys?