Glossary “drop center wheel” Definition:
A conventional wheel that has a space in the center for one bead to fit into while the other bead is being lifted over the rim flange.

Glossary “drop forged” Definition:
A piece of steel shaped between two dies when hot.

Glossary “drop through” Definition:
The undesirable sagging or surface irregularity encountered when brazing or welding; caused by overheating with rapid diffusion between the filler metal and the base metal.

Glossary “drop center rim” Definition:
A wheel that has a smaller diameter center section, to facilitate tire replacement, designed to prevent the tubeless tire from rolling off the rim when the tire blows out.

Glossary “drop center safety rim” Definition:
A wheel rim with a low center area and raised flanges designed to prevent the tire from accidentally coming off the rim.