【FITS MULTIPLE TIRE SIZES】This 28'' Gravel & 29'' MTB bike tube is compatible with many tire sizes: 700 x 32C-47C, 29'' Mountain Bike Valve Length French 45mm 【ULTRA LIGHT】The weight of the bicycle inner tube is only 46 grams, which is about 100 grams less than the traditional butyl rubber inner tube, a pair of which can save 200 grams, reduce the burden on the bicycle, and make the ride lighter 【WEAR-RESISTANT AND DURABLE】The bicycle inner tube adopts a special TPU material, which also greatly improves the durability compared with the traditional rubber inner tube; In addition, the TUP material is oil and water resistant, and has excellent load-carrying capacity and impact resistance 【REDUCE ROLLING RESISTANCE】Because the TPU bike inner tube is only 46g, it will be lighter and more delicate than the ordinary 300g rubber inner tube, and the friction force generated on the tire is small, which can achieve the maximum speed and performance 【SHOP WITH CONFIDENCE】Our products have 12 months after-sales guarantee, no matter you encounter any problems, you can contact us at the first time, we will give you the most professional technical guidance