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Is this a feasible set up or am l missing something?
The 14t sprocket does not appear to be readily available?
My understanding is that the Brompton 2-speed sprockets were matched sets of specific ratios to yield half-step gearing in combination with a 3-speed hub gear. Originally it was 13t + 15t to work with the standard spacing of the SACHS/SRAM 3-speed hub, then 12t + 16t for the Brompton Wide Range Sturmey Archer hub that changed to a 9-spline fitting. The lower sprocket of each has a standard tooth pattern, while the upper one has alternating low teeth to help with gear changing.
The Brompton specification document is available to download here:
https://www.vlerickfietsen.be/download-asset/bd785b7e-0766-11ea-8b7e-005056985c04Which confirms that it is the inner sprocket which is 1.8mm thick and the smaller outer sprocket which is 3.1mm, so the one in stock at SJS Cycles looks like it should work.
SJS Cycles have a 3 / 32" 14t 9-spline sprocket. Maybe @sbbohr and SJS can confirm compatibility:
https://www.sjscycles.co.uk/sprockets/sturmey-archer-14t-sprocket-332-flat-9-spline-hsl912/It is also available at:
https://hollandbikeshop.com/en-gb/bicycle-parts-city-bike/bicycle-sprockets/rear-sprocket-sturmey-archer/sprocket-14t-flat-3-32-9-spline-hsl-912/
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Nick_S
I have a 2 speed gearing query.
From the ratio charts my ideal set up would be 50t chainring with 14 and 16
sprockets.
Is this a feasible set up or am l missing something?
The 14t sprocket does not appear to be readily available?