Recently went to a cycling event a few hrs from where I live. Took along a younger guy, who's a bike mechanic and a much stronger racer than me.
We got there and his tyres were completely flat, he pumped them up. After the race, we pulled our bikes apart and he let the air out of his tyres - according to him to reduce stress on the tyre and give them a longer life.
Well makes sense to me, just had never heard of this before.
Anyone out there have any experience or evidence as to whether this actually does anything?, except more pumping at the start of an event