Hey all, That time again when I need to replace the skins on the ol' beast (R100RT). When ordering tires, I'm also looking at inner tubes. What a mess! Everything from about $10 to, well, $30-$40. I'm aware of the differences between synthetic and natural rubber (tear resistance, air seepage, etc) but really, what's the difference for street use in alloy rims between a $10 and $30 air bladder? Cheers all!