A great replacement model for older bikes that already have square taper cranks.

Shimano’s BB-UN55 bottom bracket carries the Shimano mark of a quality component. It’s a sealed cartridge unit available in a range of sizes for your mountain bike, and featuring English thread, and a JIS Square Taper axle. For convenience the BB-UN55 comes assembled and greased, all ready for installation.

Features & Specifications

• Model: BB-UN55
• Sizes: Choose from what’s displayed in the drop down menu
• 68x113mm
• 68x118mm
• 73x113mm
  
• Axle Style: JIS Square Taper (shimano, sugino, truvativ, and most other cranks)
• Sealed cartridge unit
• Does not include crank bolts
• Thread: English thread
• Weight: 313 grams