A twin-action rear shock absorber M with hydraulic preload for the Yamaha Tenere 700 19-22. YSS introduces the new 506 RTL rear suspension through the Z Series range. This is a new high-performance suspension unit, nitrogen - oil, with adjustment of the spring preload and the rebound damping. This particular range is fully rebuildable. Suspension Type: With a Single Nitrogen Oil Chamber Rebuildable: Yes Suspension Type With a Single Nitrogen Oil Chamber Piston Diameter 45 mm Shaft Diameter 16 mm Suspension Length 370 mm Spring Preload Hydraulic Spring Preload with a Flexible Hose Rebound Adjustment Yes Length Adjustment +/- 5 Compression Adjustment No