IUVWISN 20x4.0 E-Bike Inner Tube | Heavy Duty Universal Fit for Ridstar Q20, Macfox X1S, Super73

Meet the IUVWISN 20x4.0 E-Bike Inner Tube, a robust replacement built for miles of city streets and weekend trails. Sized for a fat tire profile, it enables quick tube swaps so you can get back on the road with minimal downtime. Its 20x4.0 sizing fits a broad range of popular e bikes, offering ample air volume and a responsive feel across varied terrains.

Designed for easy installation and reliable performance

Replacing a tube when you are on the go should not be stressful. This inner tube is designed to fit Ridstar Q20, Q20 Pro, Q20 Lite, Macfox X1S, X2, Super73 S1, S2, R, Z1, ZX, TST R002, and R002S, plus many other ebikes that use a 20x4.0 tube. The goal is a swift swap so you can ride again in minutes, whether you commute, explore a new route, or enjoy a weekend spin with friends.

• RELIABLE SEALING: Premium natural rubber provides elasticity and a solid seal inside the tire, helping maintain proper pressure and comfort on longer rides.
• THICKER VALVE STEM: A sturdier valve stem locks securely to your pump, reducing air leaks during inflation and supporting steady pressure on longer trips.
• PREMIUM RUBBER: Higher-quality rubber enhances elasticity and durability, supporting durable performance and strong air retention.
• EXCELLENT SHOCK ABSORPTION: The rubber construction helps dampen vibrations from rough pavement, smoothing the ride on mixed surfaces.

What to expect in daily use

The universal front and rear fit makes this inner tube a flexible option for many fat tire setups. When installed, riders may notice consistent tire pressure across rides and a smoother feel as they navigate potholes, gravel, and city streets. The design supports a balanced ride quality in various weather conditions and road textures.

• COMPATIBILITY AHEAD: Works with Ridstar Q20 family, Macfox X1S/X2, Super73 S1/S2/R Z1/ZX, TST R002, and R002S, among others.
• VERSATILE PERFORMANCE: A universal 20x4.0 inner tube suitable for front or rear use on many ebikes.

Note: This product includes one inner tube and installation instructions are not included. Please inspect tires and rims before mounting to ensure a proper fit.