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From reading around
- some are / were duff from the factory. SG7001-11 usually works however.
- some get broken when a shift isn't great, caused by too much pedal torque or bad cable tension
- poor bearing pre-load makes them mis-shift and leak
- changes in pressure can cause them to leak. They don't have a breather hole. Or rather they do but oil leaves with the air.
That said a lot of people seem to have got good mileage from them. Shrug.
- some are / were duff from the factory. SG7001-11 usually works however.
The 11 on our workbike outlasted a rohloff on the other workbike, whilst probably getting more use, and I prefer the shifter and lack of a step between gears and the buzzing in the rohloffs lower gears makes it feel inefficient, even if its not.