White Industries square taper stainless steel bottom brackets The $20 Shimano cartridge BBs work great, if you want to go fancy and don't want to commit to the once-a-year maintenance of the IRD cup-n-coner, get this White Industries one, instead. They're made nearby in Petaluma and should be good for a long, long time. JIS taper for White Industries, Shimano, Sugino, Clipper, etc. (but not Campy) cranks. All our bikes have 68mm bb shell width except the Gus and Susie which have 73mm bb shell width. Installation instructions https://www.whiteind.com/wp-content/uploads/2020/09/Instructionsbottombracket.pdf Tools Cup tool Hobson Zingo cartridge bb tool Park BBT-22 or BBT-32 Shimano TL-UN52 or TL-UN74-S Lockring tool 6-notch 44mm inner diameter/41mm tooth diameter or a hook spanner Hozan C-205 Park HCW-5 Weights Spindle Length 68mm BB Shell Steel 73mm BB Shell Steel 108mm 207g N/A 113mm 213g 214g 121mm 226g 227g Specs 1.37” x 24 TPI threads Compatible with 68mm or 73mm bottom bracket shells (spindles are specific to shell width) Options include: Stainless steel 108mm, 113mm, or 121mm spindle lengths 68mm and 73mm bottom bracket shell widths 108mm spindles not available for 73mm BB shell widths Bearings 2x Enduro ABEC 5 61903 LLB There are no “external” seals on this bottom bracket, only the seals built into the bearings
