Thread: Needed a pump
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Old 06-03-07 | 10:24 PM
  #22  
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cyccommute
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Originally Posted by JumboRider
A road morph and a mountain morph? Why does topeak make one for each bike type? What is the difference in pumps?
Basic gas laws. High pressure, low tire volume, small tube (road morph). Low pressure, high tire volume, large tube (mountain morph).

It's easier to push a small piston against a higher pressure than a large piston. And you need a large piston your arms don't fall off trying to pump a larger volume tire.
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