What size must the valve holes be in the wheel rim for the Caffelatex Tubeless Presta Valves?
In order to use these Caffelatex Tubeless Presta Valves successfully, the wheels / rims must be PRESTA-DRILLED (1/4″ valve hole). NO SCHRADER VALVE HOLES (21/64″ valve hole). Effetto Mariposa has begun to offer washers that will prevent the valve nut from getting inside the Schrader hole (not allowing to tighten it properly). To convert a rim with a Schrader-drilled hole you will need 2 additional pieces: a thick black rubber washer and a flat metal washer; currently, these pieces are only available upon request. To properly install the Effetto Mariposa tubeless valve on a Schrader-drilled hole, fit the thick black rubber washer on our tubeless valve, so it is down in contact with the squared rubber base. Next, mount the valve. The flat metal washer will be placed between the rim and the valve lock nut. I put a bike (with Caffelatex in the tires) on the roof of my car. I then drove to an event in 20ยบ F weather. I rode the bike in the event. The following day the Caffelatex had turned i
