The Bead Seat Diameter (B.S.D.) is the crucial dimension that determines whether a particular tire can fit onto a particular rim. It specifically refers to the “shelf”-like area inside the rim where the tire’s bead sits. The Bead Seat Diameter is the fundamental dimension used in the ISO/E.T.R.T.O.

What is the bead seat on a rim?

The bead seat diameter is a measurement on a rim that determines what tires would fit onto it. BSD is only one piece of making sure tires and rims will work together.

What is a TYRE cheater?

The Cheetah bead blaster is the ideal portable tool for tyre seating. By simply filling the booster to the necessary pressure, you can aim the barrel between the bead and wheel flange before releasing the manual valve to allow a blast of air and seal the bead.