This might be a dumb question - Presta tubes in a Shrader drilled rim?
#29
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Also, I can not remember ever seeing a rim that failed at the valve hole, presta or schraeder.
#30
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If you do enlarge your presta-sized holes, consider using a hand reamer. Harder to muck things up royally compared to using a drill.
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This works nicely for enlarging holes: https://www.amazon.com/Irwin-10233-Un.../dp/B00004THYZ
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I have a pair of Schrader drilled rims which are too narrow to take the Presta rim hole adapters I have tried. I have installed a pair of Silca 2220 Schrader to Presta adapters on my Schrader valve tubes. These are adapters which are opposite to normal as they adapt a Presta pump head to work with Schrader valve tubes. They have their own valve assembly built in and when screwed onto a Schrader valve tube they depress the Schrader valve assembly so that the valve in the adapter becomes the active one. I have installed them and just leave them on the tube stem. They have worked fine so far.
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Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
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