The SDI Free Piston Assembly is engineered to deliver superior durability and reliability where plastic alternatives fail under sustained load. This 48 mm unit arrives fully assembled and ready to bolt in, reducing downtime while maintaining full...

If you're running a forced induction system or air suspension setup, your piston assembly experiences extreme pressure cycles that demand metal-to-metal construction and precision engineering. The SDI Free Piston Assembly replaces inferior plastic...

Fine-tuning your suspension geometry shouldn't require a complete fork disassembly. The SDI Fork Preload Spacer gives you quick, repeatable preload adjustments on twin-chamber forks without breaking down your entire suspension setup. Whether you're...

Adjusting fork preload shouldn't require specialized tools or professional intervention—the SDI Fork Preload Spacer gives you precise control over suspension stiffness with a simple, bolt-on installation. Whether you're fine-tuning for track conditions...

Fork preload directly affects your suspension's initial spring rate and ride height—get it wrong, and you're fighting poor handling and premature wear. The SDI Fork Preload Spacer gives you the precision adjustment needed to dial in your twin chamber...

Twin chamber forks demand precise preload adjustment to dial in the perfect ride height and spring rate for your specific setup. The SDI Fork Preload Spacer eliminates guesswork and eliminates the need for expensive machine shop work—simply stack spacers...

Adjusting fork preload shouldn't require special tools or disassembly of your suspension. The SDI Fork Preload Spacer gives you precise, repeatable preload adjustments on twin-chamber forks with a simple bolt-on installation. Fine-tune your suspension's...

If you're running a CRF and hitting the limits of stock suspension geometry, this spring perch set transforms how your bike handles deep compressions and aggressive riding. By allowing you to dial in ride height and spring preload independently, you'll...

If your YZ250F or YZ450F is bottoming out on bigger hits or washing out through rough terrain, a properly tuned spring perch directly impacts how your suspension responds under load. This set lets you dial in the perfect balance between initial support...

Suspension geometry directly impacts how your bike handles under load and through the stroke. The SDI Spring Perch Set SDETCV24-SET gives you the tuning capability to dial in optimal bottoming resistance and extract deeper performance from your...

Fine-tuning suspension geometry is critical for maximizing both comfort and control across varied terrain, and the SDI Spring Perch Set SDETCV25-SET delivers the adjustability you need without expensive re-valving or complete shock replacement. By...

If you're running out of suspension travel on aggressive terrain or experiencing harsh bottoming on deep compressions, the SDI Spring Perch Set addresses these issues directly by optimizing your shock's geometry and stroke characteristics. This U.S.-made...

Suspension geometry directly impacts how your YZ handles across different terrains—and a quality spring perch set is essential for dialing in the performance you need. The SDI Spring Perch Set gives you the adjustability to tune your bike's bottoming...

Suspension geometry directly impacts your bike's stability and comfort, especially during aggressive riding or rough terrain. The SDI Spring Perch Set lets you dial in your YZ250F/450F's suspension characteristics without replacing major components,...

Stock piston wear bands deteriorate rapidly under damping cycles, causing friction buildup and inconsistent suspension response within the first few hours of use. The SDI DU Piston Bushing Conversion Kit replaces this wear band with a DU composite...

Stock piston rings are a compromise between cost and performance—they wear rapidly during initial operation, causing your damping characteristics to shift unpredictably within the first five hours. The SDI DU Piston Bushing Conversion Kit replaces that...

Stock piston rings shed their wear band rapidly, often within the first five hours of operation, causing unpredictable low-speed damping and performance loss. The SDI DU Piston Bushing Conversion Kit eliminates this inconsistency by replacing that wear...

Stock piston wear bands degrade rapidly, causing inconsistent damping within the first five hours of operation and compromising your suspension's performance throughout the oil's service life. The SDI DU Piston Bushing Conversion Kit replaces this wear...

Stock piston rings wear dramatically within the first five hours of operation, degrading low-speed damping and compromising suspension consistency when you need it most. This DU Piston Bushing Conversion Kit eliminates that performance loss by replacing...

Stock wear bands degrade rapidly under damping loads, causing inconsistent performance and accelerated component wear within the first five hours of operation. The SDI DU Piston Bushing Conversion Kit replaces that compromised design with a low-friction...