VALVE EXTENDER SIZING
standard tubular valve stem & standard tubular valve with tire mounted on 30 mm deep rim
40 mm extender 28 mm extender 20 mm extender
all mounted on a 30mm height rim with valve core reinstalled
40mm valve extender with Silca pump head in place / red line shows extent pump head reached
25mm should be allowed for solid pump head positioning
TO CALCULATE VALUE EXTENDER LENGTH USE FORMULA BELOW
RIM HEIGHT + HEIGHT REQUIRED FOR PUMP HEAD (25mm) - STANDARD VALVE HEIGHT (36mm)
better a little too long than too short
place an appropriate valve extender on your spare tires before riding or racing
saves time changing a flat
207 219-8858