Shimano® Octalink® right cup with external notches
ISIS Drive™
The BBT-18 has 8 notches with an outside diameter of nominally 43.4mm. The inside-to-inside width is approximately 38mm. Each notch is approximately 3.9mm wide. The hole in the center of the casting is 22.5mm, and will not fit over the 30mm spindles.
WARNING: California Proposition 65
This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm.