Park Tool CB-4 is a 100% biodegradable, plant-based degreaser designed to keep your drivetrain and components spotless. Use it with the CM-5.3 or CM-25 Cyclone Chain Scrubbers, or with a brush for general cleaning. CB-4 penetrates deep to remove dirt, grime, and grease from chains, cassettes, chainrings, pulleys, and other components—leaving them clean and running smoothly. Safe on alloy, plastic, rubber, and carbon fibre, it’s an environmentally friendly way to maintain your bike without harming the finish or performance of your parts.

Key Features

• CB-4 Bio ChainBrite is a 100% biodegradable, natural, plant-based degreaser
• It removes the toughest grease and grime build-up from chains and bicycle components
• Bio ChainBrite also doubles up as an excellent general-purpose bicycle degreaser
• Regular use of Citrus ChainBrite and the CM-5.3, and regular use of a quality chain lubricant will reduce gear system wear and friction and promote smoother, quicker shifting