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2. Head tube - Wikipedia

   en.wikipedia.org/wiki/Head_tube

   A bicycle head tube with a partially installed bicycle headset; the locknut has yet to be fitted onto the fork steerer tube. The head tube is the part of a cycle's tubular frame within which the front fork steerer tube is mounted. [1] On a motorcycle, the "head tube" is normally called the steering head. On bicycles the manufacturer's brand ...

3. Headset (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/Headset_(bicycle_part)

   The head tube can stretch, allowing a headset cup, which is supposed to be a tight interference fit, to become loose in the tube. Lugless frames are most vulnerable; in a lugged frame the lug reinforces the top and bottom of the head tube and generally prevents stretching of this type.

4. Lugged steel frame construction - Wikipedia

   en.wikipedia.org/wiki/Lugged_steel_frame...

   Simple, pointed head lugs on this bike boom road bicycle Elaborate hand-cut and filed head lugs which have been outlined in a contrasting colour (luglining) on a Hetchins frame Lugged steel frame construction is a method of building bicycle frames using steel tubing mated with socket-like sleeves, called lugs.

5. Stem (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/Stem_(bicycle_part)

   On the other hand, a quill stem must be sized to match the inner diameter of the steerer tube. Thus a quill stem made to fit a 28.6 mm (1 + 1 ⁄ 8 in) steerer tube has an outer diameter of 25.4 mm (1 in). For 25.4 mm (1 in) steerer tubes the quill diameter is most often 22.2 mm (7 ⁄ 8 in) but some older American bicycles used 21.15 mm. Some ...

6. Serum-separating tube - Wikipedia

   en.wikipedia.org/wiki/Serum-separating_tube

   These tubes should be used with care when measuring drug or hormone levels because the drug or hormone may diffuse from the serum into the gel, causing a reduction in measured level. The gel in SST II tubes (which appears slightly less opaque) is supposed [weasel words] to have less effect on drug levels in serum. [citation needed]

7. Head badge - Wikipedia

   en.wikipedia.org/wiki/Head_badge

   Head badges may be made of metal or plastic, and they may be held in place with adhesive, screws, or rivets. Some are simply stickers, apparel, decals, or painted logos. Head badges for a single brand may change from year to year or from model to model, as demonstrated by the variety (5) of Trek head badges pictured in the gallery below.