They are a rubber part and a fairly important one at that, so it wouldn't hurt to keep them in tip top shape. I plan on replacing mine once every couple years because at this rate it looks like I will need a new set of tires each year. I would recommend trying to get the stems from the place you get your tires or some place local to save on shipping costs.
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"Never argue with an idiot, they will just drag you down to their level and beat you with experience" -Unknown
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