Suspension Components for 2018+ Harley M8 Motorcycles. The 2018+ M8 Suspension collection at TC Bros offers premium suspension upgrades designed to enhance performance, handling, and the custom style of your Milwaukee-Eight Harley-Davidson. This category features high-quality shocks, springs, and related components, tailored for models like the Softail Street Bob, Fat Bob, and Low Rider. Built to deliver improved ride dynamics and durability, these suspension parts are perfect for both factory upgrades and fully custom builds. With its roots in unique chopper and motorcycle craftsmanship, TC Bros not only delivers best-in-class products but inspires custom builders to create bikes that are as smooth to ride as they are bold to behold.