Maybe it's not the valves. Maybe it's the pump you're
using. I've used both Prestas and Schrader's and
can't say that I can tell the difference in either.
Depending upon the temperature extremes, you will have
to pump up your tires more or less times, since they
do lose air.

HOWEVER, the pump you are using should be able to
handle way beyond 60 psi. I've got a portable
compressor purchased at Home Depot made by Campbell
Hausfeld. I have owned 2 of these in 10 years, paying
about $45 for each. You can use the charge pack or
the car lighter. They can handle 230 psi easily and
you won't have them dying out on you. That is unless
you don't recharge it. I highly recommend the
investment. They are worth their weight in gold.

Just my 2 cents.

Cheryl



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