Scooter rear gas shock absorbers for Yamaha NMax 125-155 YSS TB220-335P-03-8-X with adjustable preload spring to replace the original part. Gas-emulsion shock absorbers absorb stresses better than the original hydraulic models thanks to the use of gas in combination with oil. They guarantee a more linear, precise and constant operation in all conditions. Wheelbase 335 mm, eyelet 10x16mm upper joint and lower fork 20mm with M8 thread joint.