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With all the new "standards" in the headset world today it is getting increasingly difficult to choose the correct one for your bike and frame. We do our best to navigate you through these murky waters. Our headsets are organized first by 'Threaded' or 'Threadless' style. 'Threaded' headsets are typically only found on older, city, special application or inexpensive bikes. They are distinguished by a threaded steerer tube on the fork and a quill type stem. 'Threadless' headsets are found on almost all modern bikes and are distinguished by a smooth steerer tube on the fork and a threadless compatible stem. After determining the style we use the SHIS (Standardized Headset Identification System) developed by Cane Creek to describe the headset type. There are 4 parts to the naming system divided by a forward slash (/). The first part is the upper headset type and diameter. The second part is the stem clamp diameter. The third part is the lower headset type and diameter. The fourth and final part is the crown race diameter. For example, if you were looking for a traditional press in cup, 1 1/8" straight threadless headset you would be looking for EC34/28.6/EC34/30. This describes an external cup 34mm upper with a 28.6mm (1 1/8") stem clamp and an external cup 34mm lower with a 30mm crown race (which fits a 1 1/8" steerer tube). Still unsure what size you need for your bike? Send us an email or give us a call here at 1-800-BIKEMAN.