The bottom of the extension is threaded like normal valve extensions but the top is not. So you can't fit a presta valve on top, but you can on the bottom? In any case, there's no practical way to use them with tubulars. A complete waste of money. I even tried forcing the extensions into my valve and it didn't even come close. Both sides tried, no bones. What the hell were they thinking? The only other thing I can think of is that they are copyrighted for Supacaz valving and tubeless/tubular setups.
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