No Drive

[biking_fox]

Hit a bump on the way into work this morning and lost drive. Very odd. Gear shift feels ok, but pedals spin equally forwards as backwards. Chain etc all fine. I've had this happen once before on a cassette where the pawl/rachet had failed, but I didn't think rohloff uses this??

Will have a closer inspection later today, but if anyone has any idea what to look for, ideas welcome!

Its a 16yr old hub, on a Raven Sport frame.

[biking_fox]

Well it was an easy fix. The lockring had become loose, and then the rear cog jumped off the splines....

Why it happened and how to prevent are questions for another day. More cleaning needed and then tightening the lockring fully.

[mickeg]

Congratulations.  Thanks for telling us the diagnosis, then next time this happens, we know what to say.  That must have been a significant bump you hit.

I was going to suggest that perhaps your gear cables were too tight and somehow you accidently turned your shifter to the midpoint between two gears.

[martinf]

Had something similar happen twice with Nexus 8 Premium hubs on bikes I maintain.

On both occasions the rider (different in each case) got a bungee cord trapped between the Chainglider and the spokes, so behind the sprocket.

This forced off the circlip that holds on the sprocket.

[PH]

Glad you found the solution, I couldn't think of any possible cause, though I hadn't considered it having the lockring.  Why choose it over the snap ring?  The lockring tightens to 30Nm, which seems pretty high, I'd have suggested Loctite, but Rohloff specifically say no.