Differences

This shows you the differences between two versions of the page.

--- tech:derail [2022/04/21 07:29] – mtbtimeline
+++ tech:derail [2022/10/27 06:23] (current) – mtbtimeline
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 ===== Changing Gears =====
-Riding off-road demands quick, wide gear changes.  The complex machinery of derailleurs and shifters has gone through continual growth, much of which has been driven by mountain biking.
+Riding off-road demands quick changes across a wide selection of gears.  The complex machinery of derailleurs and shifters has gone through continual growth, much of which has been driven by mountain biking.
-The timeline already has a [[components:]] page, created to help date 80's bikes by their derailleurs.  This page addresses a full century's worth of changing gears, from the to birth of derailleurs to [[https://bike.shimano.com/en-EU/technologies/component/details/rapidfire-plus.html|Rapidfire]] to [[https://bike.shimano.com/en-EU/technologies/component/details/bump-stopper.html|bump stoppers]].
+Elsewhere, mtbtimeline already has a [[components:]] page created to help date 80's bikes by their derailleurs.  This page addresses a full century's worth of changing gears, from the to birth of derailleurs to [[https://bike.shimano.com/en-EU/technologies/component/details/rapidfire-plus.html|Rapidfire]] to [[https://bike.shimano.com/en-EU/technologies/component/details/bump-stopper.html|bump stoppers]].
-For the first 50 years cyclists suffered without gearing, consigned to riding fixies on level surfaces at restrained speeds.  In 1884 a freewheel was finally attached to safety bicycles, which led to coaster brakes which, well, didn't lead to gearing until 1899.  After many excellent derailleurs came to the market, it wouldn't be until 1937 that the Tour de France [[https://www.velonews.com/gear/road-gear/how-tour-de-france-embraced-derailleurs/|embraced derailleurs]] and the technology became truly mainstream.
+For the first 50 years cyclists suffered without gearing, consigned to riding fixies on level surfaces at restrained speeds.  In 1884 freewheels appeared, followed by derailleurs in 1899.  After many excellent derailleurs became popular, it wouldn't be until 1937 that the Tour de France [[https://www.velonews.com/gear/road-gear/how-tour-de-france-embraced-derailleurs/|embraced derailleurs]] and the technology became truly mainstream.
 \\
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 <div column 50% #intro2>
-Bicycle gearing was simply measured by the height of the (overly large) front wheel.  The higher the wheel, the higher the top speed, so that racers would often have wheels as tall as 60 inches.  That is, if their legs were long enough to straddle the tires and reach the pedals.((According to this [[https://www.unicycle.co.uk/faq/article/what-size-penny-farthing-to-buy|chart]], you'd need a 38" inseam to ride a 56" penny farthing.))  Gear inches are still used [[https://en.wikipedia.org/wiki/Gear_inches|today,]] where a typical range of gears is from 22" -> 100" for a mountain bike.
+With the first [[https://en.wikipedia.org/wiki/Penny-farthing|penny -farthing]] bicycles, the higher the wheel, the higher the top speed, so that racers would often have wheels as tall as 60 inches.  That is, if their legs were long enough to straddle the tires and reach the pedals.((According to this [[https://www.unicycle.co.uk/faq/article/what-size-penny-farthing-to-buy|chart]], you'd need a 38" inseam to ride a 56" penny farthing.))  Bicycle gearing today is often measured in terms of the height of an equivalent penny farthing bicycle and are called [[https://en.wikipedia.org/wiki/Gear_inches|gear inches]].
 \\
-By [[https://en.wikipedia.org/wiki/Whippet_(bicycle)|1899]], lever operated, simple derailleurs became available, and were good for two rear gears on a freewheel, on a safety bike with suspension and rim brakes.
+By [[https://en.wikipedia.org/wiki/Whippet_(bicycle)|1899]], lever operated, simple derailleurs became available, and were good for two rear gears on a safety bike with suspension, freewheel and rim brakes.
 </div>
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 ===== Mountain Derailleurs =====
-Early mtb builders tried using touring derailleurs for their wide ranges.  They were not particularly robust: prone to clogging, misalignment and simply snapping under the punishment which mtbs endure.  Creating light weight, strong, performant and affordable mountain derailleurs continues to drive development today.
+The first mtb builders used touring derailleurs for their wide ranges.  They were not particularly robust: prone to clogging, misalignment and simply snapping under the punishment which mtbs endure.  Creating light weight, strong, performant and affordable mountain derailleurs continues to drive development today.
 </div>
 <div column 45%>
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 \\
 SunTour MounTech GTL, 38T capacity,
-mountech_gtl.jpg
 [[https://www.disraeligears.co.uk/site/suntour_mountech_gtl_derailleur_5500.html|disraeli]]
@@ Line 154: / Line 153: @@
 {{m700.jpg?300|1982 RD-M700}}
 \\
- Shimano Deore XT RD-M700, 40T capacity [[https://www.bikeforums.net/classic-vintage/1064087-shimano-rd-m700-derailleur-deerhead-advice-needed.html#&gid=1&pid=8|bikeforums]]
+-5 variations of the Shimano Deore XT RD-M700, 40T capacity
-((Each of the RD-M700s pictured here is slightly different.))
+\\
+ [[https://www.bikeforums.net/classic-vintage/1064087-shimano-rd-m700-derailleur-deerhead-advice-needed.html#&gid=1&pid=8|bikeforums]]
+((Each of the RD-M700s pictured here is slightly different.  Note the M700-SP //super plates//.))
 </div>
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 ===== 1991 Shimano XTR =====
-At the same time that Campagnolo saw some space above XT in the mtb market, Shimano dropped their //**R**//ace version of their XT groupset; the first with integrated shifters with brakes and rapidfire triggers.  It has remained the top end of mountain bike components: the Dura-Ace of mtb gruppos.((See XTR history at [[https://www.shimano.com/en/100th/history/products/58.php|Shimano]].))
+At the same time that Campagnolo saw some space above XT in the mtb market, Shimano dropped their //**R**//ace version of the XT groupset; the first with integrated shifters with brakes and rapidfire triggers.  It has remained the top end of mountain bike components: the Dura-Ace of mtb gruppos.((See XTR history at [[https://www.shimano.com/en/100th/history/products/58.php|Shimano]].))
 </div>
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 {{xtr.jpg?300|1991 Shimano XTR}}
 \\
-[[https://velobase.com/ViewGroup.aspx?GroupID=0998dbac-dc80-4ff6-a9c7-a7b413923ea4|RD-M900]] Shimano XTR groupset, [[https://www.facebook.com/ShimanomtbNorthAmerica/photos/throwbackthursday-back-in-1992-xtr-m900-was-born-the-ultimate-in-off-road-compon/10155750250682762|Shimano Facebook]]
+[[https://velobase.com/ViewGroup.aspx?GroupID=0998dbac-dc80-4ff6-a9c7-a7b413923ea4|RD-M900]] 1992 Shimano XTR groupset, [[https://www.facebook.com/ShimanomtbNorthAmerica/photos/throwbackthursday-back-in-1992-xtr-m900-was-born-the-ultimate-in-off-road-compon/10155750250682762|Shimano Facebook]]
 </div>
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-SRAM started as a maker of [[https://www.bikemag.com/blog/exclusive-the-product-that-changed-the-world/|Grip Shift]] in 1987, a twist shift system for triathletes' aero bars.  Branching out to mountain bike downhillers, whoses glove were probably too fat for Rapidfire, they signed [[https://mmbhof.org/greg-herbold/|Greg Herbold]] in 1990 and SRAM found it's niche in between the heavyweight component manufacturers.  After 7 years of making just Grip Shifts, SRAM came out with a full component set.
+SRAM started as a maker of [[https://www.bikemag.com/blog/exclusive-the-product-that-changed-the-world/|Grip Shift]] in 1987, a twist shift system for triathletes' aero bars.  Branching out to mountain bike downhillers, whose glove were probably too fat for Rapidfire, they signed [[https://mmbhof.org/greg-herbold/|Greg Herbold]] in 1990 and SRAM found it's niche in between the heavyweight component manufacturers.  After 7 years of making just Grip Shifts, SRAM came out with a full component set.
 {{grip.jpg?200|1988 Grip Shift}}
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 To be finished...
+\\
+Should include:
+  * rapidfire : under bar shifting
+  * clutches : chain stabilizing tension derailleur clutch
+  * bump stoppers : a Shimano effort to quiet bouncing derailleurs
+  * electronic shifting : incl. wireless
+  * integrated shifters : brakes and shifting merged - more of a road advantage
+  * 1x systems : giant cassettes to the rescue
+  * belt and direct drives : not really a plus
+  * more?
 </div>