Joined: Jun 2014
Posts: 4,628
Likes: 943
From: Ontario, Canada
Bikes: iele Latina, Miele Suprema, Miele Uno LS, Miele Miele Beta, MMTB, Bianchi Model Unknown, Fiori Venezia, Fiori Napoli, VeloSport Adamas AX
If I use a Presta valve tube in a rim drilled for a Schrader valve I also use a thin washer I've filed the sides of to fit into the wheel well of that wheel. The washer has a hole just large enough to fit the Presta valve through. Oh, that washer goes under the rim tape.
Cheers