A bicycle phone holder, a common bike accessory, provides a secure and accessible way to mount your smartphone on your handlebars for navigation, tracking, or other uses while cycling. Key specifications include universal compatibility with various phone sizes (typically 4 to 7 inches), adjustable handlebar diameter (0.9 to 1.3 inches), 360-degree rotation for optimal viewing angles, and durable materials with shockproof and anti-vibration features. 
Key Specifications:
Universal Compatibility:
Phone Size: Most holders are designed to fit phones ranging from 4 to 7 inches in screen size. 
Phone Thickness: Some holders can accommodate thicker phone cases, with limits around 15mm or 18mm. 
Handlebar Diameter: Holders typically fit handlebars with diameters between 22.2mm and 31.8mm (0.9 to 1.3 inches), according to a cycling website. 
Material and Construction:
Durable Materials: High-quality materials like aluminum alloy or robust plastic are used to ensure durability and impact resistance. 
Shockproof Design: Look for features like anti-vibration pads and 4-corner security grips to minimize vibrations and prevent the phone from falling or slipping, according to a product page on Amazon. 
Adjustability and Features:
360-Degree Rotation: Allows for viewing the phone in both landscape and portrait modes. 
Adjustable Angle: Some holders offer multiple adjustment points for optimal viewing angles. 
Secure Grip: The holder should securely grip the phone, preventing it from falling or wobbling. 
Ease of Installation:
Tool-Free Installation: Many holders can be installed without requiring any tools, with simple clamping mechanisms and adjustable screws, according to a product page on Amazon. 
Other Considerations:
Water Resistance: Some holders offer basic water resistance, but it's not a standard feature. 
Scratch Protection: Some holders include silicone pads or other materials to prevent scratching the phone.