Headset (bicycle part) - Wikipedia. Parts of a threadless headset before installation. The headset is the set of components on a bicycle that provides a rotatable interface between the bicycle fork and the head tube of the bicycle frame. The tube through which the steerer of the fork passes is called the head tube. A typical headset consists of two cups that are pressed into the top and bottom of the headtube.

Inside the two cups are bearings which provide a low friction contact between the bearing cup and the steerer. Traditional bicycle head tubes and headsets are sized for a 1- inch- diameter (2. Many frame and fork manufacturers are now building their parts around a steerer tube with a diameter of 1. The larger diameter of the head tube and headset gives added stiffness to the steering portion of the bicycle. Common sizes. 1. This may have a fork crown (The base of the fork steerer tube) of a number of different dimensions. Milling may be necessary to make some headsets fit. ISO)2. 7. 0 mm (JIS)Other sizes are becoming common, more so all the time.

Although a Headshok steerer is close to 1. The Headtube dimensions for 1. The lower bearing is 1. The stack height of a frame and fork is the difference between the steerer tube length and the head tube length. Stack height is critical because a headset with a greater stack height than the frame and fork will not fit; the locknut will not thread on sufficiently (threaded) or there will be no room for the stem (threadless).

If the headset has a lower stack height than the frame and fork, spacers are added to make up the difference. There are a few different types of headset distinguishable by the way the bearings are held in place (with a lock nut or with a clamping stem), or by where they are located (inside or outside the head tube). Threaded. There are eight parts in a threaded headset (from bottom to top): crown race, lower bearings, lower frame cup (pictured as . The steerer tube is cut to the appropriate length by the bicycle fork manufacturer and the top 1–2 in (2. This process assures that no material is lost and the steerer would not be weakened as with a die or lathe cutting. Threaded forks necessitate that the threads on the steerer only use the top 1–2 inches, therefore the forks are sold in varying lengths.

If there is a need to use a fork that is too long, meaning the fork steerer is not threaded down far enough, a bicycle mechanic can use a die to extend the threads. This is not recommended if the threads need to be cut farther than an inch or so. As a side note, one should never try to thread an unthreaded steerer after manufacturing as this will weaken the steerer tube. The headtube may be faced and then the cups are pressed into the headtube using a special press that ensures they are square and true. The fork crown may be faced and then the crown race is pressed on to the fork crown with a special press that also makes sure that it is square and true. Then the bearings are placed on top of the crown race, after which the steerer tube is inserted into the headtube. The upper bearings are placed in the upper cup, and the upper race is screwed onto the steerer.

Headset Standards. This article will discuss the various headset types and standards found on modern bikes. The headset of a bicycle allows the fork steering column.

A washer, frequently a keyed washer, is placed on top of the upper race and a locknut is screwed on top of that. The adjustment of the headset to remove play is as follows: the upper race or cone is screwed down until it contacts the bearings in the upper cup. A slight preload is applied by turning the upper cone and additional 1/8 or 1/4 of a turn. The locknut is then tightened and the headset is checked for play and smooth operation. Readjustment takes place as necessary. The stem, of the quill variety, is attached to the fork's steerer tube using an expander bolt which fits through the stem from the top with a wedge at the bottom, the stem fits inside the steerer tube and can be adjusted to the correct height without disturbing the headset. To free the stem for adjustment, undo the bolt on the top of the stem a couple of turns and give the bolt a sharp tap to disengage the wedge.

Internal. Under the internal design, the races and cones are embedded into the head tube, creating a tidy, streamlined appearance. No component is visible between the fork crown and head tube except for perhaps a plastic ring, and only the locknut protrudes from the top of the head tube. In the image shown of the 2. Brodie Quantum's steering assembly, the lock nut is hidden from view by a plastic cover. The widened top and bottom sections of the head tube contain the bearings.

A quill stem inserts into the steering tube. Threadless. Patent 5. Wondershare Pdf To Word Converter 2 0 0 Cracked Tongue on this page. Cane Creek Cycling Components and expired on September 2. Headsets of this type are often referred to by the Dia- Compe (now Cane Creek) registered trademark . Like a traditional headset, it uses two sets of bearings and bearing cups. Unlike a threaded headset, a threadless headset does not have a threaded top headset race or use a threaded steerer tube.

Instead the steerer tube extends from the fork all the way through the head tube and above the headset, and is held in place by the stem clamped on top. Tightening a threadless headset requires tightening the preload bolt (or cap bolt) in the cap on the top of the stem. This bolt is connected to a star nut driven down into the steerer tube that acts as an anchor by gripping the inside of the steerer tube with a downward force. The star nut may be replaced by a self expanding wedge in some designs.

Other dimensions also matter when selecting a replacement headset. Outside diameter of the frame cups where they press fit into the top and bottom of the bicycle's.

The bolt compresses the stem down onto spacers, usually aluminum, which in turn compress the headset bearing cups. The preload bolt does not hold the fork onto the bike; after the preload is set, the stem bolts must be tightened to secure the fork in place. The adjustment must be made such that there is no play in the bearings, but allow the fork to turn smoothly without binding or excessive friction. In the threadless headset system, the spacers are important in placing the stem and preload bolt in the correct position on the steerer tube. Thus the stack height of the stem becomes important. The steerer tube of the fork must be cut to length such that it leaves at least enough of the steerer tube protruding above the headset for the stem to clamp on to; if the steerer tube is cut longer than the stem, then spacers are used to fill the gap between the stem and the conical compression washer.

Online news and press release distribution service for small and medium-sized businesses and corporate communications. Includes current items, organized by date. We're kicking off our tech coverage with deep dives into some of 2016's. 4 Pressing Head Tube Cups. This discussion will assume use of the HHP-2 Headset Press and the CRS-1 Crown Race Setter. Determine the acceptability of the headset. RIG 500 Stereo PC gaming headset. Inspired by your dedication to competitive gaming and endorsed by ESL, the RIG 500 headset delivers performance audio you can count. MS Paint, the first app you used for editing images, will probably be killed off in future updates of Windows 10, replaced by the new app Paint 3D. Microsoft lists. Shop Bluetooth Headsets at Staples. Choose from our wide selection of Bluetooth Headsets and get fast & free shipping on select orders. The headset is the set of components on a bicycle that provides a rotatable interface between the bicycle fork and the head tube of the bicycle frame.

Bicycle racers seeking the greatest saddle- to- handlebar drop for better aerodynamics will often forego spacers and cut the steerer tube down to exactly match the headset bearing cup stack height plus the stem height. Cutting the steerer tube to its minimum length prevents switching to a taller stem or to a headset cups with a higher stack height. Any increase in handlebar height after this cut requires purchasing a new fork, a stem with more angular rise (some stems can be turned over for greater height), or a special adapter that clamps onto the steerer tube and gives a higher clamping position for the original stem. In addition, many riders who may have less flexibility than a seasoned racer may wish to gain more height on the handlebars, reducing the saddle- to- handlebar drop and providing a more upright and comfortable riding position. If an owner simply wishes to replace the headset with one having a slightly larger stack height, it may be possible for a bike shop or framebuilder to mill or re- face the head tube to gain an extra 1- 2mm of stack height without having to replace the fork. Many threadless fork steerer tubes are cut longer than necessary to allow for adjustments and the steerer tube above the stem is stacked with spacers that can be moved above or below the stem to fine- tune the handlebar height.

Often these spacers are aluminum or carbon fiber, but titanium spacers are also available. Integrated bearing cups. Favored sometimes for their aesthetic appeal, integrated headsets reduce the number of parts involved in the headset assembly. Prominent standards for integrated headsets include Cane Creek's .