CST Big Boat Tube - 20" X 4.0"

Replacement inner tube for 20" x 4.0" fat tires, designed as a direct fit for Surface 604 folding eBikes. This tube uses a standard Schrader valve for easy inflation with any bike pump or gas station air hose.

The butyl rubber construction holds air reliably and resists slow leaks. Always keep a spare tube on hand so a flat tire never ends your ride early. One tube per package.