Custom Suspension for Metric Motorcycles. The Metric Suspension collection at TC Bros is designed for riders and builders who demand exceptional handling, comfort, and rugged style for their custom motorcycles. This category features premium shocks, springs, and suspension components built for durability, performance, and easy customization. Ideal for models like Yamaha XS650, Honda CB750, and other metric classics, these parts are perfect for improving ride quality or adding a bold, custom look to your chopper or bobber. With TC Bros’ commitment to best-in-class craftsmanship and rebellious design, this suspension lineup ensures your bike performs as fiercely as it looks.