Park Tool RT-2 Bicycle Head Cup Remover — Oversized The Park Tool RT-2 Headset and Bottom Bracket Cup Remover makes bicycle headset cup removal easy. The tool is pulled through the frame until the flared ends snap in behind the cup. The tool end is struck with a hammer or mallet and the flared ends evenly distribute force around the cup as the cup is driven out. Strong, heat treated alloy steel construction with nickel finish. Designed for 1 1/4" and 1 1/2" headset standardsSHIS terminology: Removes ZS44, ZS49, ZS55, ZS56, EC49 and EC56 headset cupsAlso removes cups for one-piece crank systemsNominal OD of shaft is 1" (25.4mm)For use on 38–55mm (1.5" to 2.1") bearing races Park Tool RT-2 Bicycle Head Cup Remover — Oversized The Park Tool RT-2 Headset and Bottom Bracket Cup Remover makes bicycle headset cup removal easy. The tool is pulled through the frame until the flared ends snap in behind the cup. The tool end is struck with a hammer or mallet and the flared ends evenly distribute force around the cup as the cup is driven out. Strong, heat treated alloy steel construction with nickel finish. Designed for 1 1/4" and 1 1/2" headset standardsSHIS terminology: Removes ZS44, ZS49, ZS55, ZS56, EC49 and EC56 headset cupsAlso removes cups for one-piece crank systemsNominal OD of shaft is 1" (25.4mm)For use on 38–55mm (1.5" to 2.1") bearing races TRUSTED SINCE 1963 Since our origins in the back of a bike shop in 1963, it has been Park Tool's sole mission to design and manufacture high-quality tools that empower mechanics and riders of all skill levels to service their bicycles. Just like our other 500+ tools, our bottom bracket tools are a product of our decades of experience and expertise in the industry, in the shop and on the trail.