Bicycle - Revision history

Mts5140 at 18:37, 2 January 2012

2012-01-02T18:37:16Z

GICL Bot: GICL Bot: Updated link(s)

2009-03-17T23:03:33Z

GICL Bot: Updated link(s)

Btf5014: /* Seat */

2008-02-15T18:35:58Z

Seat

Scp5005: /* Shifters */

2008-02-14T20:49:43Z

Shifters

Scp5005: /* Shifters */

2008-02-14T20:49:24Z

Shifters

Maa5163: /* Shifters */

2008-02-14T20:37:17Z

Shifters

Maa5163: /* Shifters */

2008-02-14T20:34:00Z

Shifters

Btf5014: /* Seat */

2008-02-14T20:29:05Z

Seat

Maa5163: /* Shifters */

2008-02-14T20:28:52Z

Shifters

Btf5014: /* Seat */

2008-02-14T20:27:54Z

Seat

← Older revision		Revision as of 18:37, 2 January 2012
Line 90:		Line 90:
	Rear spring-damper suspension systems were not widely commercially available on mountain bikes until the early 1990's. In combination with front shocks the bikes were coined with the term "full suspension frames". However, the concept was developed more than a century before.		Rear spring-damper suspension systems were not widely commercially available on mountain bikes until the early 1990's. In combination with front shocks the bikes were coined with the term "full suspension frames". However, the concept was developed more than a century before.
	[[Evolution_Rear_Shock]]		[[Evolution_Rear_Shock]]
		+
		+	==Supporting Wiki pages ==
		+	'''Product Dissection: Single-Use Cameras''': [[Single-Use Cameras]]
		+
		+	'''Product Dissection: Bicycles''': [[Bicycles]]
		+
		+	'''Refrigerator''': [[Refrigerator_Whirlpool]]
		+
		+	'''Washer''': [[Washer_MAYTAG]]
		+
		+	'''Dishwasher''': [[Dishwasher_Electrolux]]
		+
		+	'''LCD TV''': [[LCD TV_Westinghouse]]

@@ Line 39: / Line 39: @@
 Click here to download the full CAD Assembly model of the bicycle (unzip the two files in the same folder):
-[[Media:Bike_Assembly_1_2.zip|Bicycle Assembly - Part 1]]
+<!--GICL Bot edit:-->[[Bike_Assembly_1_2.zip Contents|Bicycle Assembly - Part 1]]
-[[Media:Bike_Assembly_2_2.zip|Bicycle Assembly - Part 2]]
+<!--GICL Bot edit:-->[[Bike_Assembly_2_2.zip Contents|Bicycle Assembly - Part 2]]
 == Derailleur ==

@@ Line 74: / Line 74: @@
 == Seat ==
 The seat supports most of the bicycle rider's weight.  For more details on the seat, click here: [[Bicycle_Seat]].
 == Wheels ==

@@ Line 85: / Line 85: @@
 == Shifters ==
-Bicycle shifters are used to change the gear ratio while riding.  They work with parts called derailleurs to shift the chain from one gear to the next.  Shifters started as simple levers with infinite range and evolved into indexed shift points and ergonomically correct shapes.  To learn more about the history of bicycle shifters, see http://gicl.cs.drexel.edu/wiki/Shifters
+Bicycle shifters are used to change the gear ratio while riding.  They work with parts called derailleurs to shift the chain from one gear to the next.  Shifters started as simple levers with infinite range and evolved into indexed shift points and ergonomically correct shapes.  To learn more about the history of bicycle shifters, click here: http://gicl.cs.drexel.edu/wiki/Shifters
 == Rear Shocks ==

@@ Line 85: / Line 85: @@
 == Shifters ==
+Bicycle shifters are used to change the gear ratio while riding.  They work with parts called derailleurs to shift the chain from one gear to the next.  Shifters started as simple levers with infinite range and evolved into indexed shift points and ergonomically correct shapes.  To learn more about the history of bicycle shifters, see http://gicl.cs.drexel.edu/wiki/Shifters
-http://gicl.cs.drexel.edu/wiki/Shifters
-−
-'''Friction shifters'''
-−
-Friction shifters use levers mounted on the top, down, or head tube of a bicycle frame.  The levers are connected via steel cables to derailleurs, which are mechanisms that switch the chain from gear to gear.  Pulling the lever puts the cable into tension or relaxation, which either pulls or releases the derailleur and pushes the chain to a different gear.
-Friction shifters do not have set stops in the shift point.  The rider has to manually adjust the lever so that the chain is centered on the gear.  Lining up the chain and gear is more difficult on this type of shifter, but it is easier to set up initially because it does not require much fine tuning.  This lever system started with just two or three gears and eventually went up to five and six gears.  Friction shifters were generally considered harder to use, and had problems such as unwanted shifts and noisy operation.  The use of friction shifters has been eased with the invention of things such as ramped gears and idler or floating gears on the derailleurs.
-−
-−
-−
-'''Index Shifters'''
-−
-Index shifters are not a separate type of shifter but an innovation in shifting technology.  Indexed shifters can be levers like friction shifters, or handlebar mounted triggers or twisters.  These shifters function differently than friction shifters in that they have set shift points for each gear.  This means that each gear has a set position on the shifter.  Once in position, the position cannot be fine tuned by using the shifter.  The position of each preset shift point is determined by setup and tuning of the derailleurs.  The positions need to be set perfectly from a static position since they are not adjustable while being ridden.  This type of operation is preferred over friction shifters because of the ease of shifting while riding.  Major drawbacks include a more difficult set up and incompatibility with other brands.  Most index shifters work with specific parts, unlike friction shifters which worked with almost any part brand.
-−
-−
-−
-'''Brifter or dual control levers'''
-−
-While index shifters were an improvement to friction shifters the rider still lost some riding stability when shifting gears.  This issue was resolved with the introduction of the Brifter.  The system combines an index shifter into each brake lever and for this reason became known as a Brifter.  This system allows the rider to shift quickly and accurately without sacrificing stability which is important during a race.  Brifters are often combined with cassette modifications which allow the chain to transfer power during a shift which utilizes the Brifters rapid shifting capabilities.
-The downside to Brifters are there cost and complexity.  Due to the large number of moving parts they can be less reliable because there functionality depends of cable tension.  Over  time cables stretch and require routine tightening to ensure adequate performance.  Finally some brands are almost impossible to be rebuilt; Shimano STI levers in particular are notorious for this resulting in a large expense to be replaced if one fails.
 == Rear Shocks ==

← Older revision		Revision as of 20:37, 14 February 2008
Line 100:		Line 100:


−	~~'''Twist-Style Shifters'''~~
−	Twist-style shifters are located on the handle bars and are operated by turning the handle bars. They work by moving a derailleur in and out which moves the chain on the gears. Most bicycles have two shifter to change two different gears. The location of the shifter makes it convenient as you don’t need to move your hands to shift gears.
−	~~[[Image:twistshifter.jpg]]~~
−
−	~~'''Lever Shifters'''~~
−	Lever style shifters are also located on the handle bars of the bicycle. They have two levers one to shift up, one to shift down. Like the twist shifters, there are usually two for two separate gears. Often located with the levers is the brake which is convenient while riding.
−
−	~~Both the twist style and lever shifters were each developed for the index shifters which allow you to shift directly into gear as opposed to friction shifters~~

	'''Brifter or dual control levers'''		'''Brifter or dual control levers'''

@@ Line 101: / Line 101: @@
 '''Twist-Style Shifters'''
 Twist-style shifters are located on the handle bars and are operated by turning the handle bars.  They work by moving a derailleur in and out which moves the chain on the gears.  Most bicycles have two shifter to change two different gears.  The location of the shifter makes it convenient as you don’t need to move your hands to shift gears.
 '''Lever Shifters'''

← Older revision		Revision as of 20:28, 14 February 2008
Line 98:		Line 98:

	Index shifters are not a separate type of shifter but an innovation in shifting technology. Indexed shifters can be levers like friction shifters, or handlebar mounted triggers or twisters. These shifters function differently than friction shifters in that they have set shift points for each gear. This means that each gear has a set position on the shifter. Once in position, the position cannot be fine tuned by using the shifter. The position of each preset shift point is determined by setup and tuning of the derailleurs. The positions need to be set perfectly from a static position since they are not adjustable while being ridden. This type of operation is preferred over friction shifters because of the ease of shifting while riding. Major drawbacks include a more difficult set up and incompatibility with other brands. Most index shifters work with specific parts, unlike friction shifters which worked with almost any part brand.		Index shifters are not a separate type of shifter but an innovation in shifting technology. Indexed shifters can be levers like friction shifters, or handlebar mounted triggers or twisters. These shifters function differently than friction shifters in that they have set shift points for each gear. This means that each gear has a set position on the shifter. Once in position, the position cannot be fine tuned by using the shifter. The position of each preset shift point is determined by setup and tuning of the derailleurs. The positions need to be set perfectly from a static position since they are not adjustable while being ridden. This type of operation is preferred over friction shifters because of the ease of shifting while riding. Major drawbacks include a more difficult set up and incompatibility with other brands. Most index shifters work with specific parts, unlike friction shifters which worked with almost any part brand.
		+
		+
		+	'''Twist-Style Shifters'''
		+	Twist-style shifters are located on the handle bars and are operated by turning the handle bars. They work by moving a derailleur in and out which moves the chain on the gears. Most bicycles have two shifter to change two different gears. The location of the shifter makes it convenient as you don’t need to move your hands to shift gears.
		+
		+	'''Lever Shifters'''
		+	Lever style shifters are also located on the handle bars of the bicycle. They have two levers one to shift up, one to shift down. Like the twist shifters, there are usually two for two separate gears. Often located with the levers is the brake which is convenient while riding.
		+
		+	Both the twist style and lever shifters were each developed for the index shifters which allow you to shift directly into gear as opposed to friction shifters

	'''Brifter or dual control levers'''		'''Brifter or dual control levers'''