CST Big Boat Fat Tire - 20" x 4.0"

The CST Big Boat is a purpose-built fat tire designed for 20-inch folding electric bikes. At 4.0 inches wide, this tire delivers the stability and cushion that makes fat tire eBikes so enjoyable to ride.

The thick rubber compound resists punctures and wears evenly under electric-assist loads, while the wide tread pattern maintains traction on varied surfaces including pavement, gravel, and packed dirt.

Please note this listing is for one tire only, no tube included. The Big Boat is the stock tire used on Surface 604 folding models, ensuring a perfect fit and ride quality that matches the original specification. Whether you are replacing a worn tire or carrying a spare, this is the tire designed specifically for your ride.