The Delta pedal is upgraded with a stainless abrasion plate to decrease direct scratch to pedal body, which increases durability. In addition to that, the material has been changed to thermoplastic which makes it lighter weight. The E-PR73ST features low stack height which allows greater ground clearance as well as increased pedaling efficiency. - 85 x 94 mm - Fiberglass-reinforced thermoplastic, enclosed mechanism, tension adjustable with gauge - 9/16"