Since everybody else threw there 2 cents in, here are mine. I use my bike for commuting on less than ideal roads (kaliche rock, chip seal). I keep them close to maximum psi. If the tubes are designed for narrower tires, I get frequent failures where the stem is glued to the tube. It separates. I've never had this problem when the tube is sized for the tire. I know I put a lot of abuse on the tires and I do not need tubes that cannot handle it. I buy the size called for. My tires are 27 x 1 1/4 inch with a maximum psi of 100.) Mike
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