15t sprocket (cog) for modern Brompton 3spd?
Is there enough clearance for a 15t cog on modern (mine's 2007) 3spd sturmey archer bromptons?
I searched a bit, but from the ~10 year old archives that said only a 14t would work. There is a tight clearance between the frame and cog.
The Brompton manual says that this should work, but this breaks the data from the folding society archives :
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REAR SPROCKETS: for geared hub (to ISO 10230): non-derailleur, ½" x 13T x 3mm thick (but for lower gearing, use a 14T or 15T sprocket): derailleur, special Brompton sprockets, 13T and 15T only.
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Any easy source for the part in the US? I'm not familiar with their interchangeability with other more common parts (ie BMX).