Having had my Raven Tour for a few years now I had some questions about the oil change process. I sent them to Rohloff and here are my questions and Rohloff’s reply. Thought I’d share with the forum - Peter
My Questions:
I have been using my Rohloff equipped bike (Thorn Raven Tour) for four years now and like it very much. I have a couple of questions.
The recommended procedure for changing the oil on a Speedhub is to first add the rinsing oil, run the hub to mix the rinsing oil with the regular oil, drain the oil then add the replacement oil. Would not more of the old oil be removed if the procedure was to first drain the old oil, add the rinsing oil, run the hub to mix, drain the hub again then add the replacement oil. Is there any reason for the procedure Rohloff recommends?
I do about 10,000 km per year on my bike. As per the recommendation from Rohloff I have been changing the oil twice a year over the past 4 years that I have owned the bike. I have heard a rumor that oil changes can be left to every 10,000 km or once a year whichever comes first. Can I do an annual oil change instead of the biannual changes I have been doing?
Reply:
We state that the cleaning oil should be added firstly to the mixture for several reasons:
The SPEEDHUB is a product which is used all around the world and in many different temperature zones. The colder teh temperature, the thicker the oil. At normal room temperature, the original SPEEDHUB oil is thick enough that this will hardly and if so, very slowly depart from the hub. If water has penetrated the gear-unit (through washing with a jet-wash or due to several stream crossings etc), then the viscosity of the oil changes and the extraction of this oil can become very slow and tiresome if not thinned initially. In extremely low temperatures this can become near-on impossible.
Completing the procedure in this manner will cost a customer (if done at their local bike shop) an incredible amount of labor due to the time required. Then their is the extra cost/problem of storage and disposal.
The cleaning oil bottle is twice as large as the amount of contents within, the reason for this is so that the old oil can be filled back into this container for safe and easy disposal. If the container is still full, then the mechanic must find another suitable, safe container for storing the initially extracted oil before they use the cleaning oil. This would most probably not be done safely, especially when the oil-change is completed in remote regions around the world.
More oil would however most probably not be removed even if completing the task in this manner. The attribute of the oil itself means that this remains stuck to the surface areas of all inner components of the gear-unit. Only the free oil can be removed and the amount of this depends upon a number of factors such as the amount of sweat oil lost or moisture that has penetrated the system or the time the wheel is left before extracting the oil mixture, the temperature when the procedure is carried out.
The procedure we wrote is the best method for the majority of SPEEDHUBs. As a manufacturer we are legally obliged to prescribe 1 universal method so that all customers may be clear how to maintain their hub without voiding their warranty.
Warranty states that an oil change should be carried out once annually or every 5000km, whichever comes first. If this is upheld, then we guarantee that the SPEEDHUB will continue to work as it should. If you wish to leave the oil change intervals over longer periods, then you may have luck and this not have any negative influences upon operation, however any problems that arise should be compensated by an immediate oil change. With luck, there will be no lasting damage to components within your hub. If the SPEEDHUB needs to then be shipped to us for repair, then you may be faced with an invoice should the problems be directly related to either non-OE oil or missing oil changes.
The main reason for the prescribed oil changes is to ensure that any lost oil is replaced (failure to do so may result in components starting to rust which will obviously hinder correct operation) and also to ensure that any penetrated moisture is rinsed out (water can mix with the oil increasing resistance for moving elements and lead to shifting malfunctions).
I hope this information has helped somewhat.
Have a nice day.