From a theoretical standpoint of wear and overall efficiency go with the largest Rohloff input sprocket which is the 16 tooth that you mention. Motorcycle chain drives used to claim a 50% reduction in chain life between using a 13 tooth and a 16 tooth sprocket for the drive chain.
--- In Geared_hub_bikes@yahoogroups.com, "ttostrander" <ttostr@...> wrote:
> Hi guys,
> I'm preparing a new build with a Rohloff and have a question. I currently run 42/16 which is a 2.63 ratio. My question is if you keep the exact ratio, is there any reason to scale up or down the chainring and sprocket sizes? I don't plan to violate the minimum ratio of 2.35 suggested by Rohloff.
> Thanks for your input,