Genuine replacement parts When it's time to refresh or upgrade your seatpost, Trek Genuine Replacement Parts have you covered. 製品詳細 Designed for Line Elite 34.9 dropper seatpost Cross compatible to Line 34.9 dropper seatpost For riders who need a shorter seatpost or travel for their fit Spacers are not 'stackable' to create greater travel reductions Refer to the Service Manual for assembly & service instructions