Ask the Expert Bike Tech: Flat Tires


Do you get flat tires on your bike and don’t know why?

This week’s “Ask the Expert Bike Tech (and Professional Bicycle Fitter)” comes from Bill who asks:

My son’s hybrid bike that he rides around campus is flatting on just about every ride.  It seems to be always flatting around the valve stem.

It is an older hybrid bike, with 700 x 35c tires on it (somewhat knobby tires).  Recommended tire pressure on the tire is 50-75PSI, I suggested he run at the low end (~50psi) of this in case impacts are causing flats, but the flats continue.

This past weekend we ran a new rim tape around, replaced tire, got it back together, his first ride to campus – flat again.  We cannot find any burrs or edges on the wheel itself, and the tire seems fine.

Our resident Bike Guru, Victor, had this to recommend:


If you have any questions about the mechanics of your bike or improving the fit between you and your bike, please be sure to send them in to Ask the Bike Tech. Consider Victor your own private bicycle expert and professional bike fitter.  Send your questions to:

Enjoy Your Ride

Tags: , , , , ,

Pin It

Featured on these top sites

Check Out These Sites

Cycling 360 Podcast


Sugar Alternatives for Energy and Hydration

Question: I am using the homebrew sugar formulations (sometimes added to green tea).  I am also trying to wean myself off 1/2 dose adrenalean “lip tonic delivery system” (biorhythm brand- caffeine, hoodia g, synephrine, yohimbe) capsule for energy.

My question is other than juice, can you suggest modifications in lieu of table sugar for energy and hydration.


Both raw/organic honey or agave can work great in the homebrew (substitute in the same quantities for the sugar, or to taste), but you do have to shake well in order to make sure they don’t settle out.  Have you tried either of these?  Also, make sure to use at least the minimum amount of salt recommended in the homebrew as the temps rise, you need the sodium replacement if you’re sweating.

Sports Drink Homebrew

Please send us your questions for our Expert Sports Nutritionist, Kelli Jennings to “Ask the Sports Nutritionist“. Kelli Jennings is a Registered Dietitian with a passion for healthy eating, wellness, & sports nutrition. For more information go to

Nutrition Tips