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-   -   New Sturmey Archer 5 speeds (http://www.bikeforums.net/folding-bikes/770261-new-sturmey-archer-5-speeds.html)

chagzuki 09-23-11 08:15 AM

New Sturmey Archer 5 speeds
 
What's this new 'N' range all about? Looks like the Brompton 6 speed type of thing. . . how many sprockets/cogs are meant to fit on the driver? Is that how the Shimano system always looks, i.e. with enough space to adjust sprocket/chainline position or is this clearly intended to run 2 sprockets?

fietsbob 09-23-11 10:59 AM

Got links?


using the updated sheldon gears math engine that new 5 speed
is adding 1v and 5v to an aw3 ratio set, for 2nd and 4th
whereas the older 5 speeds tightened up the ratios.

chagzuki 09-23-11 11:49 AM

On the SA website there's a bunch of new 5 speeds that have a 9 spline type sprocket fitting, which look similar to the brompton double-sprocket driver.

tcs 09-23-11 03:13 PM

Quote:

Originally Posted by chagzuki (Post 13267137)
What's this new 'N' range all about?

The driver interfaces with a nine-spline Shimano cassette style cog, rather than the usual three tab cogs. I'd guess it's something that OEMs and today's bike shops have asked for.

Drdul 09-23-11 07:11 PM

Quote:

Originally Posted by chagzuki (Post 13267137)
What's this new 'N' range all about?

The only 5-speed hubs I can find on the SA website with a "N" designation are described as "now available with a 9 spline driver." In this one, for example, the image shows some sort of splined thingy on the right side where I assume the cog slips on, rather than threading on.

fietsbob 09-23-11 10:45 PM

Quote:

how many sprockets/cogs are meant to fit on the driver?
You have to measure .. BWR hub Made specifically for Brompton is for 2 3/32 cogs
planetary internal ratios are wider than the 4/3 and 3/4.. in the middle gears.

they could have used the same driver that they fit in the BWR hub , but that is Idle speculation.
see what the Hubstripping blog has to offer,

Write the Importer/distribuitor, or call a shop that stocks both..

tcs 09-25-11 08:45 AM

Quote:

Originally Posted by Drdul (Post 13270483)
In this one, for example, the image shows some sort of splined thingy on the right side where I assume the cog slips on, rather than threading on.

FWIW, Sturmey-Archer has not made IGHs that take threaded-on cogs for, hmm, around 60 years now. The standard pattern, and one that's shared with most Shimano and SRAM (Fichtel&Sachs) IGHs is the three-tab interface. The "thingy" is called a driver.

fietsbob 09-25-11 11:31 AM

The new S3x a fixed gear hub with 3 speeds , threads the splines,
so you can use a screw on freewheel. [Or a spline cog for using it , as a fixed gear]

It is the lower 3/5ths of a 5 speed hub , 1:1 is the top gear

White industries Dos is a 2 cogs machined out of one piece freewheel ..


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