; all the foregoing propelled by laterally mounted pedals designed to be pushed in an alternative elliptical step motion (provided for in subheading 8712.00.50) Free No change No change On or before 12/31/2020 . 1587. Unicycles Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.09 Unicycles (provided for in 8712.00.50) Free No change No change On or before 12/31/2020 . 1588. Bicycle disc brakes Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.10 Disc brakes designed for bicycles, and parts thereof (provided for in 8714.94.90) 7.5% No change No change On or before 12/31/2020 . 1589. Zee cages Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.11 Z -shaped water bottle holders (cages) of alloy or composite material, designed for use on bicycles (provided for in 8714.99.80) Free No change No change On or before 12/31/2020 . 1590. Bicycle wide angle reflectors Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.12 Wide angle reflectors, designed for use on bicycles (provided for in 8714.99.80) Free No change No change On or before 12/31/2020 . 1591. Baby strollers Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.13 One-piece baby strollers, each with non-detachable seat