Kit Piston Upgrade ROCKSHOX DebonAir C1 160 mm ZEB A1+ (2021+) #00.4020.574.009 OEM Sizes Chest Measurement Waist Measurement Sizes:230 × 62.5 mm Santacruz Sizes Chest Measurement Waist Measurement XS 89 94cm 74 79cm S 94 99cm 79 84cm M 99 104cm 84 89cm L 104 109cm 89 94cm XL 109 114cm 94 99cm XXL 114 119cm 99 104cm XXXL 119 124cm 104 109cm Measure your chest circumference by passing the tape measure under the armpits and over the upper chest but also from a design and style perspective will allow you to replace your air piston with the latest evolution developed by the brand on the 2021 models This ROCKSHOX DebonAir C1 160 mm ZEB A1+ (2021+) upgrade piston kit