1 1/8" (28.6mm) ZS headset Replacement part for many Trek road bikesSteerer outer diameter 28.6 mm (1-1/8")Crown race inner diameter 30 mmCup Insertion OD Semi-integratedHeadtube ID 41 mmStack height 9 mmBearing type SealedHeadset type upper Unthreaded fully integratedHeadset type lower Semi-integrated
This product is covered by Trek's Unconditional Guarantee - If for any reason you’re not satisfied with your purchase, return the item within 30 days for an exchange or store credit.
