Durable aluminum alloy construction - Built from aluminum alloy to provide strength and long life, helping the speedometer resist wear and extend its service life. Compact and lightweight performance - Small size and light weight for convenient use. - Measures speed and distance with reliable performance, making it suitable for cycling and fitness enthusiasts. Wide compatibility with common wheel sizes - Designed for 26, 27.5, 28, and 29 inch bikes. - Please verify your wheel size before purchase to ensure proper fit. Easy do-it-yourself installation - Quick and straightforward to install without special tools or extra effort. Use scenarios - Daily urban commuting: track speed and distance during everyday rides for better planning and motivation. - Road or mountain training: monitor pace and progress during workouts and training sessions. - Fitness riding on various terrains: ideal for cyclists who want a simple, reliable way to measure performance on different bike setups. Key attributes at a glance - Function: measures speed and distance - Material: aluminum alloy for durability - Size compatibility: fits 26/27.5/28/29 inch bikes - Installation: easy and DIY-friendly - Performance: compact, lightweight design for convenient use