OK I feel a bit silly with this question but maybe some one can help me.
I pump up my tires before every ride. I have never had a problem before today. I opened the valves (presta) , released a bit of air to be sure they were open, and attached the floor pump the same way that I do it every single time. Today the air would not go in the tire. It was very difficult to pump and I could hear air leaking out. I tried reattaching the pump to the valve, checking to make sure the valve was indeed open and pumping about ten times without success with both the front and rear tires. Finally after about 15 minutes, and much cursing, I got it to work and pumped the tires up. I could not figure out what the problem was and why it finally worked. Any ideas?
Thanks