The distance between the inside surfaces of the rim flanges.
It is the minimum distance included between the inside of the balconies and represents the tyre seating area.
Distance between the two opposite inside edges of the rim flanges.
The distance between the inside surfaces or the rim flanges. (See Tire and Rim Association Year Book.)
This means the nominal distance between rim flanges.
The distance between the flanges of a wheel.
the measurement between the flanges of a rim