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I've had that happen with schrader valves when I don't get the fitting on the valve stem all the way. There's a little pin that has to be pressed down in order for air to get into the tire, and if it isn't pressed down enough, it won't allow any air in no matter how much you pump. Make sure you press hard enough to fully seat the pump fitting onto the ...


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Air is not going in valve. If Presta valve, the nut on top must be loosened. Then tap the end with your finger. You'll hear a little air escape. Connect the pump chuck and inflate. If a Scrader valve (like a car tire valve), the chuck probably is not pressed on far enough.


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Pressure is the ratio of force to the area over which that force is distributed, so if you want to use less force, solution may be a double-handle pump with a thinner cylinder. Pump with a large diameter cylinder can pump air faster but needs more force. Pump with a smaller diameter cylinder will deliver less air with a single stroke, but requires less ...


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It sounds like your pump is not on the valve properly, so instead of inflating the tire you're just pressurizing the inside of your pump. Does your bike have Schrader valves (the kind you see on a car) or Presta valves (skinnier, with a kind of pointy top)? If it has Presta valves, make sure the top of the valve is unscrewed. There's a little nut that you ...


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One trick I have used in a pinch when my stem was too short for the rim depth (as your picture is showing) is to place my thumb against the tire at the point of the stem and carefully press in until the stem is being held out of the rim. This can give the leverage needed to attach the pump head to the short stem length. While the stem extender solution is a ...


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Interesting question, and I enjoyed the technical answers given, but... I am continuously amazed at the overemphasis placed on the weight of bikes. Yes it is important, but relative to other factors it is not that significant. Lets compare a 20# bike to a 24# bike. If your budget is $1000 for a new bike, would you choose a 20# bike with very good components ...


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No one has really addressed the size versus pressure part of the question. Nominally different sized tires will have about the same mass of air. As the size of the tire goes up the design pressure goes down. The contact patch must support the weight of the rider. Assume bike with rider is 100 lbs on the rear wheel. At 100 psi the size of the contact ...



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