Do trek bicycles require special air pump?
The ones that I have are models 330. Valve stems look as though the core is sticking out.
Those sound like Presta valves. Your car tires and cheaper bikes have Schraeder valves, which have a spring inside the valve keeping it closed.
Presta valves do not have a spring, and are kept closed by air pressure and the little "nipple" that twists closed on the end.
Untwist the nipple and inflate with any pump that has a Presta head on it, or go to the bike shop and spend 99 cents on a Presta-to-Schraeder adaptor that you screw onto the Presta valve.
Most bikes designed for performance come with those stems, called "Presta", versus the ones you are probably thinking of, and cars and inner tubes use them, are "Schrader".
Most bike pumps are designed for Presta valves only, or are able to handle Presta or Schrader.
Or, like the other person mentioned, you can buy an adapter for a $1. It's best to get a pump specified for Presta though, if that is what you have.
Yeah, lucky me, I got to find out Presta valves are different when I flatted on a ride with my new bike. My patch kit was unnecessary as the pump I carried from my old bike had no adapter. Good thing I took a ride close to civilization and only had to roll my bike to the bike shop during a rainstorm. Now I carry a spare tube either in my pack or in the car. The patch kit is for getting me back to the car in case of a catastrophic dual blowout.
Those are presta valves, you can get an adapter for presta to shrader if you like as I use them on my road bike to make filling simpler.
Yes, they are presta valaves. But, the comment that performance oriented bikes have presta is ignorant. The type of valves a bike has does nothing for performance.
You can ask you local bike shop to enlarge the holes so that schrader valves will fit. Then, it may be easier to find tubes to fit your rims and tires.
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