【Ultra-light Inner Tube】Made of thermoplastic polyurethane elastomer material (TPU), reduce weight, 70% lighter than the old butyl rubber inner tube. Makes it easier to carry and more sensitive 【Strong and Puncture Resistant】The new TPU material has good puncture resistance, wear resistance, durability and anti-aging. They ward off sudden flats and maintain stable performance, even at lower tire pressures. In addition, the TPU material is oil and water resistant, and has excellent load-carrying capacity 【Enhanced Air Tightness】These road bike inner tube feature presta valves.The internal design of the air rod is optimized to make it more airtight. The application of the valve pad rubber effectively reduces the friction between the tire tube. Choose from metal&TPU 65mm/85mm valve lengths to suit your bike rim 【Fits Multiple Tire Sizes】This road series Inner Tube is compatible with many tire sizes: 700/18C-28C, 700/18C-32C (Includes Bike Tube Patch Repair Kits) 【Proper Inflation Instructions】To prevent irreversible damage, avoid overinflating the inner tube when not installed in the tire. When installing, start with an initial inflation of 0.5 PSI, ensuring that the inner tube adheres closely to the tire's inner wall Featherweight and Durable Our bike tubes are crafted using advanced Thermoplastic Polyurethane (TPU) technology, striking the perfect balance between durability and lightweight design. Taking roadbike inner tube as an example, Ridenow offers three versions for 700C: 39g，36g, 24g, and 19g. The lightest 19g version is even lighter than the self replenishing fluid injected into vacuum tires. Optimized Air Tightness RideNow bicycle tire tube uses special reinforcing materials to make TPU inner tube valves, which are structurally stable, sturdy, and durable.Choose from 45mm/65mm and 85mm Presta valve lengths to suit your bike rim. Cost-Effective for Road Cyclists Our innovative TPU inner tubes deliver exceptional puncture resistance, ensuring heightened safety. They ward off sudden flats and maintain stable performance, even at lower tire pressures. Guidelines for bike inner tube Inflation and Usage: 1.Precautions for Inflating bicycle tube: The tpu inner tube should not be inflated significantly when not installed in the outer tire, as it may cause irreversible damage. 2.Inflation Instructions for RideNow Tube: Before inflating, turn the valve inward (towards the center of the tire circle). Inflate a small amount until the inner tube is round; pressure should be kept below 0.35 bar(5 PSI) 3.Maximum Tire Inflation Pressure: Tire inflation pressure must not exceed 5 bar/72 PSI when using rims with a no-ring-lip system. 4.Include Stickers： Inner tubes come with a sticker, not a patch. The sticker is designed to stabilize the valve stem, preventing it from shaking and making noise by touching the spokes or rim during cycling.