Progressive front fork springs YSS - Yamaha Tracer 900 850 MTT850 ABS / Tracer 900 850 GT MTT850-D ABS - YSS

Progressive fork spring set - YSS for Yamaha Tracer 900 850 MT09TRA ABS (2017) / Yamaha Tracer 900 850 MTT850 ABS (2018-2020) / Yamaha Tracer 900 850 GT MTT850-D ABS (2018-2020).

Product Description:

- YSS internal fork springs are stiffer than the original;
- The YSS progressive wound fork springs are made from high-quality steel;
- This allows for a reduction in wire thickness, making the spring more responsive;
- To improve oil flow in the fork, the springs are fully polished and ground on the top and bottom;
- This also reduces noise in the fork;
- The delivery package includes 2 springs for a complete fork conversion;

Technical Data:
- Spring model: progressive;
- Length: 305 mm;
- Diameter 1: 36.5 mm;
- Diameter 2: 34 mm;
- Spring rate 1: 8.5 N/mm;
- Spring rate 2: 12 N/mm;
- Left air chamber: 150 mm;
- Right air chamber: 150 mm;
- Recommended viscosity: 10W.

The complete application list can be found below.