2piece punctureproof tire liner set designed to protect inner tubes on mountain, highway, folding and dead fly bikes. The polyurethane composite belt forms a durable barrier against glass, crushed stone and other road debris while adding minimal weight. Key benefits Reliable puncture protection: Polyurethane composite material creates a lasting layer between tire and tube to reduce flats from sharp objects. Ultralightweight: Added mass is minimal — 64 grams for 700C and up to 108 grams for 29' — so protection comes without noticeable riding burden. Secure, lowfriction fit: The liner conforms to the inner tire surface and shrinks slightly under air pressure for stable positioning that won't shift or rub during use. fit: Cuttable design fits common wheel sizes (26', 27.5', 29' and 700C), allowing quick trimming to match specific tire dimensions. Easy installation: Twopiece belt layout and flexible material permit fast placement inside the tire and straightforward trimming for a precise fit. Features and specifications Quantity: 2 pieces per set Material: Polyurethane composite Weights: 64 g (700C) to 108 g (29') Compatibility: 26', 27.5', 29', 700C wheels; suitable for mountain, highway, folding and dead fly bikes Function: Internal tire liner / belt tyre tape protector to prevent punctures to inner tubes Use scenarios Offroad trail rides: Place inside mountainbike tires to defend against glass, sharp stones and embedded debris on rocky tracks. Daily commuting: Protect inner tubes from road glass and construction debris on city and highway routes to reduce flats and roadside repairs. Touring and travel with folding bikes: Lightweight protection added before packing or long rides to lower the risk of punctures on unfamiliar roads. Installation tips Insert liner inside the tire before seating the bead, inflate to let the liner conform and settle, then trim excess for a snug, nonshifting fit. Use one liner per wheel; cut carefully along the liner's length to match tire circumference and avoid overlap. Provides practical, lightweight puncture protection without altering ride feel or tire performance.