The DVO Emerald uses a Tapered 1 1/8″ to 1.5″ steer tube. Your frame must have a straight 1.5″ head tube or a tapered 1 1/8″ to 1.5″ head tube. Depending on your frame manufacturer you will either have a external cup press-fit or integrated style headset. Please contact your bike manufacturer to make sure you have the correct headset configuration that can accept a tapered steer tube for your frame.
Common Headset Sizes and Styles
EC49 – External headset lower 1.5″. This is a pressed in headset where the bearing sits in a cup on the outside the frame
ZS56 – Internal headset lower 1.5″. Internal cups press almost completely into the frame. These are often preferred for their low stack height and clean look.
IS52 – Integrated headset lower 1.5″. A bearing (usually a sealed cartridge unit) sits directly into the frame eliminating the need for cups. Found on many carbon fiber bikes today.