Chain guide for single chainring setups — adjustable with a wrench without removing the cranks. Key benefits Prevents chain drops: designed to keep the chain securely on a single chainring, reducing interruptions and drivetrain damage. Smoother, more stable running: optimized for single chainring flywheels so the chain track is steadier under load. Fast, tool-friendly adjustment: can be adjusted in place with a wrench — no need to disassemble the cranks for tuning or maintenance. Wide compatibility: fits mountain bikes and road bikes that use a single chainring configuration. Important specifications Intended use: single chainring flywheel (single chainring crankset). Frame clamp size before installation: 34.90 mm diameter. Convertible clamp sizes after installation: adapts to 28.6 mm and 31.8 mm diameters once installed. Function: chain guide to stabilize and secure the chain so it does not fall off. Performance and practical advantages Reliable chain retention for aggressive riding and long efforts, improving confidence on technical trails and during sprints. Simple on-bike adjustments let you fine-tune alignment quickly after gear changes or wheel swaps. Typical use scenarios Mountain biking: keeps the chain on during rough, technical descents and rock gardens where chain drops are common. Road and gravel riding: ideal for riders running a single chainring setup who want consistent chain retention during long rides and group efforts. Training or commuting: reduces stops for chain repairs and simplifies maintenance for daily use. What you should expect A straightforward chain guide solution for single chainring bikes with specified clamp diameters. On-bike adjustability with a standard wrench, stable chainline performance, and compatibility with common MTB and road frames that match the listed diameters.