HEY all,

I am fairly new to Biking. I just got a Cannondale 500 over X-MAS and putting about 5-10 miles a day on it. Got to get in shape before I ride a long ride..

My question is how often should I be putting air in the tires? They hold 100/120 psi and it seems like every week when I check, they are down to 80.

I know it is probably a stupid question for all you who've been doing this for a long time, but any help is greatly appreciated.