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1 ⅛ th (1.125”) – This is becoming outdated now, but is essentially a straight steerer tube that measures 28.6mm except for the where the crown race is installed that is 30.0mm This is considered as being an older standard with almost everything now running Tapered.This is by far the most common on high quality bikes. This set up is basically the same weight as a straight steerer while also boosting stiffness and strength. It tapers from 28.6mm where your stem clamps out to 39.8mm where the crown race sits. (1.125” to 1.5”) - This is by far the most common type. There is 2 major and 2 much less common types of fork steerer tubes. ZS – Zero Stack / Semi Integrated / Internal Effectively the cup is built in to the frame There is no cups in this headset, the bearings drop straight into the frame. The Headset bearing sits outside or external to the frame. (more on that later).Ĭrown Race – This is performs a similar job to the Compression ring in that the bearing is tightened down so the tapered part sits snugly into the tapered part of the cartridge bearing.ĮC - External Cup. Note - If you have an "internal" headset, you won't have this part. Upper & Lower Head Tube Cup – This is the cup that is pressed into the frame using these tools. This is the part that allows the steerer to turn in the frame. This is the cover that sits over your headset bearings to ensure that no dust/dirt can get into your bearings.Ĭompression Ring – This is a tapered or conical shaped ring that is the most important part in keeping your tight.Ĭartridge Bearings – Most headsets will have sealed cartridge bearings in them. tThe Cap Bolt screws into this nut.ĭust Cover – The name kind of says it all. They are designed so they can be hit in and not come back out. Star Nut - This is the part that is driven into your forks steerer tube. Don't forget to tighten your stem/crown bolts back up! You can tighten your headset by loosening your stem bolts (and your top crown bolts on a DH bike) and tightening down on this bolt till firm. Top Cap & Cap Bolt – These are the two parts you can see on the top of your stem.