Part Number Technical Breakdown
OB220: The YSS Bravo series. It is an oil-damped shock absorber (hydraulic emulsion), featuring a 22 mm piston diameter and typically a 10–12 mm shaft diameter.

Key Technical Specifications
Type: Single rear hydraulic oil shock absorber.

Adjustments: Spring preload only, adjustable across 5 or 6 step positions using the provided hook wrench. It does not feature rebound or compression damping adjustments.

Intended Use: Daily urban commuting.

Key Advantage: A cost-effective solution for replacing a worn OEM shock absorber, delivering a firmer feel and improved control over road imperfections compared to standard factory suspensions.