I just had a discussion with a friend who has his car tires filled with Nitrogen. He swears by it and told me that recently he experimented with nitrogen on his road bike and he said he can tell a difference as the tires seem to stay inflated to the proper pressure longer and rarely requires adjustments.

I work in the car industry and I'm very well aware of the alleged advantages of filling car tires with Nitrogen but I'm not 100% sold.

Please discuss your opinions/experiences with road bike tires filled with Nitrogen.