Challenge

Corsa Latex Tube 700 x 28/35mm 47mm valve

I picked these up for the 2nd half of cross season. No pinch flats, no flats actually, in 5 races. This despite running really low PSI. In the first race with them, I smacked water bar barriers that would have pinch-flatted a butyl tube. These tubes helped me postpone an offseason purchase of a tubular setup until I can earn them. Be extra careful during installation. Don't air them up outside of the tire. Make sure your rim is smooth and the tape/strip is covering all edges or rough surfaces. When removing the clear cap it also unscrews the presta valve. A bit unsettling until you lose the cap.