For those of you that care, both the 46mm and 42mm Galaxy Watch 4 classics run a 20mm band. Some folks (including Samsung support) have been saying they run 22mm. : r/WearOS
Buy 20mm 22mm Metal Milanese Band Strap for Samsung Galaxy watch 4 40mm 44mm Classic 42mm 46mm Active 2 Gear S3 S2 Classic for Huawei Watch 2 Pro amazfit at affordable prices —