Stems - Revision history

Quill: {{Parts}}

2009-07-31T22:12:38Z

← Older revision		Revision as of 22:12, 31 July 2009
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	''Potencia'' (f)		''Potencia'' (f)


			{{Parts}}
	[[Category:Bicycle Parts]]		[[Category:Bicycle Parts]]

Jonathan: /* Length */

2007-12-02T00:59:19Z

Length

← Older revision		Revision as of 00:59, 2 December 2007
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	=== Length ===		=== Length ===

	The second way is the length of the quill and length of the extension (the part of the stem that goes forward to hold the handlebar). At the co-op, we sort stems by the length of the extension, ignoring the length of the quill. The drawers are either sorted by length in millimeters or sometimes by "short" vs. "long". Like with saddles, stem extension lengths are best sorted by comparison to things already in the drawer. In the picture below, the length of the extension is the distance between the two red dots; it is measured "center-to-center".		The second way is the length of the quill and length of the extension (the part of the stem that goes forward to hold the [[handlebar]]). At the [[co-op]], we sort stems by the length of the extension, ignoring the length of the quill. The drawers are either sorted by length in millimeters or sometimes by "short" vs. "long". Like with [[saddles]], stem extension lengths are best sorted by comparison to things already in the drawer. In the picture below, the length of the extension is the distance between the two red dots; it is measured "center-to-center".

	=== Clamp Diameter ===		=== Clamp Diameter ===

Jonathan: /* Sorting */

2007-11-30T18:55:22Z

Sorting

← Older revision		Revision as of 18:55, 30 November 2007
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	The second way is the length of the quill and length of the extension (the part of the stem that goes forward to hold the handlebar). At the co-op, we sort stems by the length of the extension, ignoring the length of the quill. The drawers are either sorted by length in millimeters or sometimes by "short" vs. "long". Like with saddles, stem extension lengths are best sorted by comparison to things already in the drawer. In the picture below, the length of the extension is the distance between the two red dots; it is measured "center-to-center".		The second way is the length of the quill and length of the extension (the part of the stem that goes forward to hold the handlebar). At the co-op, we sort stems by the length of the extension, ignoring the length of the quill. The drawers are either sorted by length in millimeters or sometimes by "short" vs. "long". Like with saddles, stem extension lengths are best sorted by comparison to things already in the drawer. In the picture below, the length of the extension is the distance between the two red dots; it is measured "center-to-center".

	=== Clamp ~~diameter~~ ===		=== Clamp Diameter ===

	~~[[Image:quillstem.jpg\|thumb\|Quill Stem Parts - The wedge bolt head is visible from the top of the stem, just under where it is labeled.]]~~

	The third way in which quill stems vary is not one that you will generally encounter at the co-op, but you should know about it. The area where the stem clamps the handlebar can be sized differently. On modern bicycles, "road" handlebars are almost always a slightly larger size than "flat" or "mountain" handlebars, and there is a third size which is even larger that is sometimes used for either type on very expensive bicycles. Almost all stems and handlebars at the co-op are of the smallest of the three sizes, which is 25.4mm, or exactly one inch.		The third way in which quill stems vary is not one that you will generally encounter at the co-op, but you should know about it. The area where the stem clamps the handlebar can be sized differently. On modern bicycles, "road" handlebars are almost always a slightly larger size than "flat" or "mountain" handlebars, and there is a third size which is even larger that is sometimes used for either type on very expensive bicycles. Almost all stems and handlebars at the co-op are of the smallest of the three sizes, which is 25.4mm, or exactly one inch.

Jonathan: /* Parts */

2007-11-30T18:54:45Z

Parts

← Older revision		Revision as of 18:54, 30 November 2007
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	=== Parts ===		=== Parts ===

	[[Image:quillstem.jpg\|thumb\|Stem]]		[[Image:quillstem.jpg\|thumb\|Quill Stem Parts - The wedge bolt head is visible from the top of the stem, just under where it is labeled.]]

	This is what a threaded stem looks like. There are two key parts that can get lost. One is the bolt that runs vertically from where the image says "Wedge bolt head" down into the wedge (you can see a bit of its threads). If this bolt is missing, or if it is still there but the wedge is gone, the stem will go into a bucket of incomplete stems; it isn't scrap, but can't be used until someone puts a new part on. The other part is the bolt that holds the handlebar clamp closed. If this is missing, it will go in the same bucket.		This is what a threaded stem looks like. There are two key parts that can get lost. One is the bolt that runs vertically from where the image says "Wedge bolt head" down into the wedge (you can see a bit of its threads). If this bolt is missing, or if it is still there but the wedge is gone, the stem will go into a bucket of incomplete stems; it isn't scrap, but can't be used until someone puts a new part on. The other part is the bolt that holds the handlebar clamp closed. If this is missing, it will go in the same bucket.

Jonathan at 18:53, 30 November 2007

2007-11-30T18:53:48Z

← Older revision		Revision as of 18:53, 30 November 2007
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	'''Stems'''		'''Stems'''

	~~'''Bold text'''~~== Evaluating ==		== Evaluating ==

	All a stem needs to work is to have all of its parts and not break. These two things are all you need to check to evaluate a stem.		All a stem needs to work is to have all of its parts and not break. These two things are all you need to check to evaluate a stem.

Jonathan: /* Evaluating */

2007-11-30T18:53:37Z

Evaluating

@@ Line 1: / Line 1: @@
 '''Stems'''
-== Evaluating ==
+'''Bold text'''== Evaluating ==
 == Sorting ==

Jonathan at 18:52, 30 November 2007

2007-11-30T18:52:04Z

← Older revision		Revision as of 18:52, 30 November 2007
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	''Potencia'' (f)		''Potencia'' (f)

	[[Category:~~Bike~~ Parts]]		[[Category:Bicycle Parts]]

Jonathan: New page: '''Stems''' == Evaluating == == Sorting == Put simply, stems connect the handlebar to the bicycle. The stems you will find at the co-op will generally be quill stems, like the one in th...

2007-11-30T18:51:40Z

New page: '''Stems''' == Evaluating == == Sorting == Put simply, stems connect the handlebar to the bicycle. The stems you will find at the co-op will generally be quill stems, like the one in th...

New page

'''Stems'''

== Evaluating ==

== Sorting ==

Put simply, stems connect the handlebar to the bicycle. The stems you will find at the co-op will generally be quill stems, like the one in the picture below. The lower part jams into the bicycle frame and the circular hole clamps around the handlebar. Quill stems can vary in three ways, and will generally vary in two ways at the co-op.

=== Quill Size ===

[[Image:78sizer.jpg|thumb|7/8" Stem]]

One way is the size of the quill - the lower part of the stem can be three different sizes, to fit different types of bicycles. 7/8" stems and 1" stems look similar. As the names indicate, 7/8" stems are slightly smaller than 1" stems. But don't use calipers to measure, because neither one is the size it says, and you will only be confused. You can tell the difference by trying to push the stem into the tube on the stem cabinet labeled "7/8" sizer", pictured to the right. A 7/8" stem will fit, and a 1" stem will not. 1 1/8" (one and one eighth inch) stems are plainly visibly larger.

=== Length ===

The second way is the length of the quill and length of the extension (the part of the stem that goes forward to hold the handlebar). At the co-op, we sort stems by the length of the extension, ignoring the length of the quill. The drawers are either sorted by length in millimeters or sometimes by "short" vs. "long". Like with saddles, stem extension lengths are best sorted by comparison to things already in the drawer. In the picture below, the length of the extension is the distance between the two red dots; it is measured "center-to-center".

=== Clamp diameter ===

[[Image:quillstem.jpg|thumb|Quill Stem Parts - The wedge bolt head is visible from the top of the stem, just under where it is labeled.]]

The third way in which quill stems vary is not one that you will generally encounter at the co-op, but you should know about it. The area where the stem clamps the handlebar can be sized differently. On modern bicycles, "road" handlebars are almost always a slightly larger size than "flat" or "mountain" handlebars, and there is a third size which is even larger that is sometimes used for either type on very expensive bicycles. Almost all stems and handlebars at the co-op are of the smallest of the three sizes, which is 25.4mm, or exactly one inch.

== Adjustment ==

== Spanish ==

''Poste de Manubrio'' (m)

''Potencia'' (f)

[[Category:Bike Parts]]