Achieving low gearing with Rohloff Speedhub

[Mark Bromley]

Hi,

I'm new to the group and just ordered a bike with a Rohloff Speedhub.  I'm a long time tourer and Rivendell owner (built up beautifully many years ago by Peter White Cycles) But with old age fast approaching I've ordered a new HP Velotechnik Streetmachine recumbent with Rohloff and would like to adapt the stock 46 chainring and 16 tooth cog to achieve lower gearing

I'm after a low gear gear inch number close to 15 or 16.  One supplier recommended keeping the chainring at the stock 46 and switching out the cog at the hub for a 21  ( yields a low gear inch of 15.5)

A touring blog mentioned that they had switched to a 39 chainring and 18 or 19 cog .  I was thinking of a 38 chainring and a 19 cog which yields a very low gear inch number of 14.2.  

A  similar blog, If I understand it correctly, -  said you should look for a 2:1 relationship for chainring to cog  for touring to produce a suitable low gear.

The 46/21 combo option  was noted as perhaps a little more "efficient" but I'm not sure why - so that is one question.  

Thoughts?

What is Rohloff's limit ?  Do either of these combo's exceed the Manf. limit? 

If its a toque issue i would think I'd have trouble introducing Max torque in a recumbent position.

I sure would appreciate any advice the group can offer.

[satanas]

Minimum officially permitted gear ratios are here (scroll down):

https://www.rohloff.de/en/service/handbook/speedhub/technical-data

You should be fine...

Later,

Stephen

[Mark Bromley]

Thanks Stephen,

Good info!

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