gear the most common kind of sturmey archer gear sturmey archer is a manufacturing company originally from nottingham england . it primarily produces bicycle hub gears but has also produced motorcycle hubs . the company was founded in 1902 by henry sturmey 1857 1930 and james archer under the guidance of frank bowden the primary owner of the raleigh bicycle company . 1 in 2000 the assets and trademarks of sturmey archer were sold to sun race of taiwan which was renamed sun race sturmey archer inc and production moved to taiwan . 2 contents 1 products 1.1 aw hub gears 1.2 sw hub gears 1.3 dynohub 1.4 modern gear hubs sunrace sturmey archer 1.4.1 three speed fixed gear hub 1.5 other 2 references 3 external links products edit all sa gear hubs use epicyclic planetary geartrains of varying complexity . the aw is the simplest using one set of planetary gears with four planets . the am uses three compound planets with differently sized cogs on a common shaft to engage the gear ring and sun gear separately while the close ratio three speeds and hubs with four or more speeds use multiple planetary geartrains . depending on the specific hub these may be in series with each other or with one or the other set being selectable at any given time by locking a particular sun gear to the axle . aw hub gears edit an exploded sturmey archer aw sturmey archer s most widely known product is the aw three speed hub gear introduced in 1936 and still in production as of 2016 . it is the survivor of a much larger range of a model three speed hubs including the am medium ratio for club riders the ac and ar very close ratio for time triallists and the asc a unique three speed fixed gear . in 1939 a four speed model fw was released . this led to the development of a series of five speed models and by 1994 seven speed hubs were introduced . production was low and in the mid 2000s these were discontinued . sw hub gears edit the brief story of the sturmey archer sw series medium flange wide ratio three speed hub provides strong substantiation of the merits of the aw design . sturmey archer gears ltd. designed the type sw mk . 1 medium flange wide ratio three speed hub in 1954 and began production in 1956 intending it to replace the aw series of large flange hubs . 3 compared to the aw s 25 % reduction in first gear direct drive second gear and 33.33 % overdrive 3rd gear the sw offered slightly wider gearing referred to by brian hayes as super wide gearing 3 with 27.7 % reduction for first gear direct drive second and taller 38.4 % overdrive third gear . riders appreciate the nearly silent operation of its springless centrifugal pawls . exploded view & parts list of type sw three speed mk . 1 . sturmey archer gears ltd. 1954 . smaller and lighter than an aw hub the sw has fewer parts and was thought to be less costly to manufacture than the aw series that had been in continuous production since 1936 . the new hub turned out to be slow to shift and can t be pre shifted like an aw . more troubling the unique crescent shaped pawls can have slippage issues even when a gear is fully engaged especially if the hub had not been continually supplied with fresh 10w oil . 4 production of the sw series ceased after two years 1956 57 . sturmey archer had maintained reduced aw series production during these years to aid cycle makers in the transition to the new hub . on terminating sw production in 1958 the company resumed previous levels of aw production . after the failure of the sw in the market and the re commitment to the aw sturmey archer began to widely license the design with fully interchangeable clones of the aw eventually being made under labels including j.c. higgins sears austro daimler brampton suntour and others . dynohub edit the dynohub was sturmey archer s hub dynamo for bicycles . the dynohub was designed to generate electrical lighting power for bicycles during the second world war . the initial gh12 12 volt model was introduced in 1936 followed several years later by the gh8 . this 8 volt unit was in turn supplanted in the 1950s by the lighter weight gh6 6 volt version which remained in production through the early 1980s . the term dynohub is sometimes applied generically to bicycle hub dynamos but it originates as a trademark . the gh6 version produced a rated output of 6 v 0.33 a 2 w from a 20 pole ring magnet with a stator having a continuous winding . original headlamp bulbs are 6 v 0.25 a 1.5 w e.g. cry5 and a rear bulb of 6 v 0.04 a 0.24 w e.g. cry8 . this is different from a modern standard bicycle dynamo though replacements can still be had . 5 common substitutions are the modern standard 2.4 w headlamp bulb and a tail lamp bulb of 0.6 w. one rider reports much more light with a 6.3 v 0.25 a 1.6 w type 40 bulb . 6 rated output was reached at around 20 km h 12 mph a rotational speed of approximately 60 rpm . the name dynamo implies dc output but as usual with bicycle dynamos known as generators in north america output was in fact alternating current . dynohubs were offered as front hubs and as rear geared hubs . the ag was an aw three speed rear hub with inbuilt dynamo while the fg was a dynamo similarly combined with an fw four speed . hub generators were absent from sturmey archer s product range from the 1980s until the 2006 introduction of the x fdd front hub which combines a 6v 0.4 a 2.4 w or 0.5 a 3 w dynamo with a 70 mm drum brake . 7 modern gear hubs sunrace sturmey archer edit the xrf8 xrd8 xrr8 and xrk8 8 speed hubs entered series production in 2007 . 8 sunrace sturmey archer have modified the design and manufacture in many respects ; compared to the old aw hub the current three speed equivalent srf3 now has an aluminium alloy shell for lighter weight . according to schraner and brandt an aluminium alloy shell reduced spoke breakage due to aluminium being softer allowing the spoke to seat into the flange and disperse the stress at the bend in the spoke over a wider area . 9 10 three speed fixed gear hub edit in 2009 sunrace sturmey archer re introduced a three speed fixed gear hub the s3x . 11 this gives ratios of 100 75 62.5 i.e. the top gear is direct drive and the others are geared down from it and the internals are based on the newest five speed freewheel hub in the same way as the original fixed asc was based on the contemporary fc four speed hub . other edit the sturmey archer name was also credited with the 49 cc two stroke engine fitted to early raleigh mopeds although this was actually a reworking of vincenti piatti s trojan mini motor and built by bsa s motorcycle operation . 12 references edit sturmey archer heritage website the sturmey archer story supplement a b sturmey archer bicycle hubs . sheldonbrown.com . retrieved 2012 10 10 . sturmey archer sw three speed bicycle hubs . sheldonbrown.com . retrieved 2012 10 10 . commercial cycle bulb supplier gh6 dynohub head lamp and tail lamp bulbs sturmey archer historical hub archive . retrieved on 2007 10 24 . sturmey archer gear hubs schraner gerd 1999 . the art of wheelbuilding . buonpane publications . p. 31 . isbn 0 9649835 3 2 . brandt jobst 1983 . the bicycle wheel . menlo park ca usa avocet . p. 63 . isbn 0 9607236 2 5 . sunrace sturmey archer news s3x fixed gear 3 speed . sunrace sturmeyarcher.blogspot.com . 2008 08 21 . retrieved 2012 10 10 . raleigh moped history external links edit wikimedia commons has media related to sturmey archer . official website v t e ti group subsidiaries accles & pollock alfred herbert ltd brooks england carlton cycles dowty group hercules cycle and motor company norman cycles phillips cycles raleigh bicycle company reynolds cycle technology rudge whitworth russell hobbs sturmey archer sun cycles swallow sidecar company people ivan stedeford related articles smiths group ti automotive tube investments of india limited v t e british bicycle manufacturers current a bike bickerton boardman bootie brompton campion condor dawes defiance dolan ellis briggs enigma titanium falcon genesis halfords hetchins holdsworth islabikes lotus mercian moulton muddy fox orange paper pashley pedersen phillips planet x raleigh reynolds ridgeback robin hood saracen strida thorn ti group whyte defunct ariel bsa british eagle carlton claud butler chater lea coventry eagle coventry premier elswick hopper flying scot f.w. evans freddie grubb harry quinn hercules humber norman perry roberts rover royal enfield rudge whitworth sun sunbeam triumph viking warrick witcomb components brooks england dunlop middlemores saddles sturmey archer retrieved from https en.wikipedia.org w index.php title sturmey archer & oldid 726882416 categories companies based in nottinghamshirecompanies disestablished in 2000companies established in 1902cycle parts manufacturersdefunct cycle manufacturers of the united kingdomhistory of nottinghamshirehub gears2000 disestablishments in englandhidden categories commons category with page title same as on wikidata navigation menu personal 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