The elastic properties of the rubber are reduced if you just pull it out of the box and install it without expanding it first. It’s also just common sense to do this to remove the wrinkles.
No, you're still wrong. The "wrinkles" are what get "pinched" between the rim and tire, when someone does not first, partially inflate the tube before insertion in the tire.
One should also make sure the rubber strip on the rim is good, and covers the spoke ends, or that can also cause a premature failure, as well.
Many times, I have seen where someone has gone to air up a bicycle tire at a gas station, etc. and because a compressor puts the air in so fast (unlike a car tire) they have a very loud premature failure.
I have never seen a failure, due to improper tube stretching.
I owned a bicycle shop for many years, and built many BMX bikes, from the frame up....back in the day. I know how this works, and don't need a lecture......from someone who does not.
