Improved air valve angle Hydraulic speed lock out The UNAir has been designed with a fixed ratio between 2.5 and 2.7 The TRIAIR with its adaptable air volume by changing the size of spacers inside the outer air chamber,is able to fit various leverage ratios. I n order to select the right rear shock,first make sure you select the right eye to eye length and the right stroke.These information can be provided be your frame or bicycle supplier. Once you found the right length and stroke,please make sure the mounting size of your frame fits to the selected SRSUNTOUR rear shock.The image on the left shows our factory standard setup.Different widths and diameters are available on demand. For proper performance the characteristic of frame and rear shock need to match..Please contact your bicycle/frame manufacturer first for this information before selecting the rear shock,otherwise the performance might noz be satisfactory. Color: Black Weight: 165 mm ( 6.49 inch ) , 256 g ( 0.56 Ib ) 190 mm ( 7.48 inch ) , 279 g ( 0.61 Ib ) 200 mm ( 7.87 inch ) , 290 g ( 0.63 Ib ) Adjustments:Lock out / Adjust High Pressure Riding style:XC / AM High quality surface finished. Available Size Eye to Eye x Travel: 165 x 38 mm ( 6.49 x 1.49 inch) 190 x 51 mm ( 7.48 x 2.00 inch) 200 57 mm ( 7.87 2.24 inch) ***These are OEM Suntour Parts, Brand new, Never Installed on Bike, Never used in any way, just NOT in retail packaging.***