Key benefits Simple installation and adjustment save time: clamp mounts to the seat tube and is tightened with a wrench; no need to disassemble the crank. Cleaner, more reliable chain setup: adjustable guide and connecting rod let you fine-tune chain position for smoother pedaling and fewer on-road adjustments. Lightweight, durable upgrade: aluminum alloy construction adds strength without significant weight. Main features Easy to install: seat tube clamp system allows tool-only installation and adjustment; crank removal is not required. Wide compatibility: designed to fit a variety of bicycle types and to match different frame colors with a simple, elegant appearance. Multi-point adjustability: chain guide and connecting rod can be adjusted in multiple locations to accommodate different chainlines and setups. High quality material: made from aluminum alloy for a balance of low weight and high strength to withstand regular use. Specifications Bike Chain Guide dimensions: 20.5 cm x 20 cm (8.07" x 7.87") Convert Seat dimensions (seat tube clamp area): 6.8 cm x 7 cm (2.68" x 2.76") Material: aluminum alloy Practical use scenarios Daily commuting: install to stabilize the chain and reduce mid-ride adjustments on city streets. Gravel or light trail riding: use the adjustable guide to accommodate variable chainlines and keep the drivetrain running consistently. Bike upgrades and maintenance: a quick, tool-only install when replacing components or improving an older frame without changing the crank. Why choose this chain guide Practical installation and adjustment process minimizes downtime. Versatile fit and multiple adjustment points make it suitable for many bicycle types. Durable aluminum alloy construction provides a solid, lightweight solution to improve drivetrain reliability.