On 02/09/2017 08:24 AM, iamkeith wrote:
In some cases, if tires are stiff or if the rim profile is skinny and deep, it 
can be quite difficult to keep the valve stem from pushing in toward the rim, 
until you get a few psi built up to resist.  Presta are nice because the stem 
is nutted in place.  For every other (practical) purpose, i think schrader is 
superior.

Every year i threaten to finally drill out all my rims and make the switch.  
It's so permanent, though...


I converted my Schraeder rims to Presta back in 1973 and they worked fine for many years. A grommet fills the big hole and secures the smaller Presta valve. So if you do go ahead with this (in my humble opinion ill-advised and incomprehensible) decision have no fear, you can always go back.

Steve "Presta si, Schrader no" Palincsar


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