Bike Yoke Seat Post Parts REVSPAC

- YB2122 and YB2123 include lower tube, upper stanchion bushing and wiper\n- Note on lower tubes: diameter can be changed between 30.9 and 31.6mm but NOT 34.9mm. Length must stay the same as original\n- 3rd party web sales (eBay, Amazon, etc.) are strictly prohibited by the manufacturer\n- All internal parts are available through BTI's Factory Service Center. Please contact customer service for any other parts that are needed