I had my road Bike in the back of my car and it got hot outside ( about 90 ) so inside the car was n oven. when I went to pull my road bike out of the car the front tire was flat , which really surprised me. So I Looked to see if the heat had increased the pressure and blew the tire off , it did not. When I pulled teh tude out to replace it , I checked to see where the leak was , and it turns out that the tube which has been in the wheel for Months and has many many 100's of miles on it, had been patched once before and now the air was leaking out all around the patch. I didn't know heat would botther a patch .