New bike, tire kept going flat, took it in, needed a new tube @ wanted to do A LOT of other things to the bike said it was unsafe. Brand new Motobecane bike. Got the tube and declined on the rest. Paid $32.00. Same thing kept happening to.the rear tire. Took it to Slippery Pig bikeshop said the air valve needed to be screwed shut. Works great didn't charge me a dime.I'm thinken I got screwed out of $32.00. Maybe maybe not. It's the Slippery Pig for all of my future bike needs.