My commuter bike is locked to a rack in direct sunlight all day long. I've noticed what seems to be pretty rapid UV damage to the sidewalls of the tires -- drying and cracking of the rubber. This is happening faster than the tread is wearing.
And so my question: with my next set of commuter tires, does it make sense to apply a UV protectorant, such as 303 Aerospace or Armor All, to the sidewalls (not the treads!)? Anyone else do this? Any drawbacks or safety concerns?
I wouldn't worry about the cracking rubber, it doesn't take much structural load anyway. It's the cords in the fabric that take the load the as long as those aren't compromized, you won't have any problem with the tyre. Or you can get a nicer "skinwall" tyre with no rubber on the sides.