No one carries the DogBoy
Join Date: Feb 2004
Location: Upper Midwest USA
Posts: 2,320
Bikes: Roubaix Expert Di2, Jamis Renegade, Surly Disc Trucker, Cervelo P2, CoMotion Tandem
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I use 16 gram on 700-23's and that gets me to 120 psi + the amount that leaks because I'm not very mechanically gifted. For 25's, I'd go with 16, but you might not get to full inflation.
BTW, I've been told that once you get home after using a CO2 cartridge, you need to let all the CO2 out, and pump up the tire with air. Has anyone else heard of this?