Why Is the S-Tubo CX/Gravel the Ultimate Spare Tube?

The Tubolito S-Tubo CX/Gravel All Tube compresses the already-lightweight Tubo formula into an even more compact format, delivering a tube that tucks into virtually any pocket while still matching the puncture resistance of a standard rubber tube. Built from Tubolito's thermoplastic polyurethane (TPU) compound, it provides lower rolling resistance than butyl and resists degradation from residual tubeless sealant, making it a seamless backup for wheels transitioning out of a tubeless setup.

The S-Tubo CX/Gravel fits 700c tires from 32 to 50mm and uses a 60mm Presta valve compatible with standard and deep-section gravel rims. Its packed size is substantially smaller than the standard Tubo, making it the go-to spare for minimalist kits and bikepacking setups where every cubic centimeter counts. Riders who want maximum backup reliability with minimum bulk will find the S-Tubo the smartest option in the Tubolito lineup for CX and gravel riding.