Wolf Tooth T47 External Bottom Bracket

Wolf Tooth T47 External Bottom Brackets are engineered to be smooth, durable, lightweight, fast, and user-serviceable. Wolf Tooth's ground-up design features custom bearings, seals, bushings, and cups, which eliminate creaking and balance best-in-class weather sealing with optimized bearing radial compression, alignment, and preload for low drag. They're available for 24 mm Shimano, 29 mm DUB, and 30 mm spindle diameters for maximum compatibility, and four colors to match other Wolf Tooth Color Shop components.

The bearings in Wolf Tooth Bottom Brackets feature a custom design. The balls and race are made from a hardened chrome bearing steel. This has a higher surface hardness than stainless, which improves the durability of bearing races and reduces spinning resistance and noise. An ACOSUR ZNA coating has also been applied to the race to provide corrosion resistance that is equal to or better than stainless steel after a 500-hour saltwater test. Bearing material paired with an extensive sealing system and the elimination of metal-on-metal contact means Wolf Tooth Bottom Brackets have superior performance in all conditions.

Features:

• Compatible with 24 mm, 29 mm DUB, and 30 mm spindle cranksets
• Adjustable-width sleeve fits 68 - 73 mm T47 bottom bracket shells
• Best-in-class weather sealing protects bearings from water, mud, and debris
• Custom polymer spindle bushings eliminate creaking
• Installation and removal with standard 44-16 (24 mm) and 46-12 (29 mm DUB, 30 mm) spline tools

Specifications:

• Weight:
  • 24 mm: 96 g
  • 29 mm: 97 g
  • 30 mm: 91 g
• Shell Materials:
  • 6061-T6 Aluminum
  • Glass filled Nylon
  • NBR
  • EPDM
  • Urethane
• Bearing Ball Material: AISI 52100 chrome bearing steel hardened to Rc 61-66
• Bearing Race Material: AISI 52100 chrome bearing steel hardened to Rc 60-65

Compatibility:

• Included adjustable-width internal sleeve fits 68-73 mm width T47 bottom bracket shells

Included:

• (2) x 2.5 mm shell spacers
• 24 mm: (2) x 0.5, 1, 2, 3, 5 mm spindle spacers
• 29 mm: (2) x 0.5, 1, 3, 5, 7.5 mm spindle spacers
• 30 mm: (2) x 0.5, 1, 2, 3, 5 mm spindle spacers