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Product Description
This is a variation on the 15-tooth cog that I used on my Brompton (with a 5-speed Sturmey-Archer hub) for several years.
The mounting hole is slightly smaller than the nominal 34-mm diameter, in case the print is not exact (bronze/stainless steel tends to "shrink" a bit unpredictably, even though Shapeways tries to compensate for the average shrinkage).
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