Whats the difference between ERW and DOM and chromoly steel tubing?
From I/O Port website: ERW stands for Electric Resistance Welded. This is a mild steel tubing that started out as a flat sheet of steel, formed into tubing and welded. DOM stands for Drawn Over Mandrel and it is actually ERW tubing that has gone through a second process that shapes and smooths the tubing so that the walls are more uniform. This in turn makes the tubing stronger than the original tubing. Chrome-Moly is an alloy of steel which incorporates both Chromium and Molybdenum in the process. Please don’t confuse Chrome-Moly with Chrome finish. All our roll bars are painted Black. New SCCA rule change requires all newly registered cages to be made of DOM effective 2003.
