I'm by no means a proficient bicyclist, but recently my friend, who really is in to bicycling gave me his bike from when he was little. (He's now really tall >.>, so it fits me well enough) It is probably a 300 dollar REI bike, which is still waaay nicer than anything I've ever had (39 dollar walmart bikes much :( )
In any case, the tires and tubes were sort of old. But the weirdest thing is that these random cracks started to appear in both front and rear tires. Some are longer than the one pictured below, some shorter. In any case, they all go all the way through. Is it an age problem ,are they inflated too much? What is the problem.
Secondly, today I had a fairly major hole in the tire. I just went over a small bump at like 30mph, and heard a loud pop. Is it worth trying to patch?
Thirdly, if the tires need to be replaced (do they) What would be a cheap but half reasonable quality replacement? I guess I could go more upscale, but seeing as this bike seems amazingly nice compared to my walmart bicycle shaped object, I think I"ll take it slow before getting to a really nice one >.> The tires are 26" 1.25" hybrids.
(The bike in question: http://i.imgur.com/5U9zq.jpg )