Tools & Chemicals for Harley Big Twin Maintenance and Builds. The Big Twin Tools & Chemicals collection at TC Bros is designed for riders and builders who value precision and reliability when working on their Harley-Davidson Big Twin motorcycles. This category features essential tools, lubricants, cleaners, and maintenance products tailored to fit models like Softails, Dynas, and Touring bikes. From specialty wrenches and alignment tools to high-performance oils and degreasers, these products ensure your bike stays in peak condition. Whether you're wrenching in your garage or on the road, TC Bros provides the trusted tools and chemicals you need to keep your Big Twin running strong.