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.

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 2.5 inch
Height : 0.5 inch
Length : 2.6 inch

Item Weight: 0 ounce (View shipping rates and policies)
Shipping Weight: 0.8 ounce (View shipping rates and policies)

ASIN : B000R9G7MO