This bottom bracket shell is machined from 1.875" x .120" wall 1020 steel tubing. The outside diameter is the stock tube diameter. The width is 68 mm and is finish machined to size. The bearing bore is supplied undersized, 1.640"/1.643", and must be finished to size by the framebuilder after welding. Snap-ring grooves are finished to size. The inside diameter is relieved to 1.745"/1.755".
- Use with heatsink FT5003 (see Related Products on this page).
Item sold individually.
Photo courtesy of United Bicycle Institute