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Old 10-06-2013, 03:19 AM   #77
kuhjunge OP
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Joined: Aug 2011
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Laugh The full story of SilberWolf - a GSA and a sidecar for our dogs

It was 20th of September 2013. Almost one year, 17.000km and a few modifications later, I was full of hope and confident that the building of our sidecar would be finished with this last visit to Peter and Elsbeth. I need to say at this point that obviously I am too much used to "ready bikes"

I learned now that building a sidecar has a touch of prototyping and requires a good degree on experimenting. My hopes of finalizing the sidecar now shattered like breaking glass on a floor. I really did not like it at first and it took me quite a moment to digest what was about to come (see Modifications part III)...

Anyway, since the building is almost done (I found my optimism again), I thought it might be nice for my fellow sidecar enthusiasts to summarize the story of the building of SilberWolf. Let's go back in time and see where it all started...

Let's go back in time and see where it all started...

It became obvious in the beginning that there are no limits to what kind of sidecar to built. The only limiting factors might be my wallet and time. It was all about

Decisions .... Decisions ... Decisions

April 2012 - the first question: Which bike to choose for the sidecar R100GSPD or R1150GSA?

At that time I owned a R100GSPD with a sidecar and a R1200GSA.

The R1200GSA was instantly out of the race. I had one as a rental bike in NZ in 2011. After a day's ride we stopped at our hotel and when I wanted to start the bike again it did not do anything. It was also not possible to jump-start the bike. Obviously the CAN-bus is very sensitive when it comes to the battery voltage and does not allow starting the bike unless the voltage is within a certain range. Sorry BMW, this bike is not made for adventures with no service station around for hundreds of kilometres

Back to the R100GSPD. The way this bike was built, it was only good for asphalt streets and easy gravel roads – nothing for a little more heavier terrain. Neither was it suitable for carrying all the dogs and our luggage for this journey. A new frame and a new boat were required one way or the other – so its all about the bike itself: to buy a used R1150GSA or to use my R100GSPD.

There would have been some work needed to make the PD ready to go (generator, ignition, clutch, kardan, front fork, back tyre with new brake and size for car tyre, smaller first gear). If I would buy a R1150GSA, I would also need to do some modifications (clutch, rear shock, front fork, remove ABS, exchange end-drive from 850, buy a tester device for ignition, exhaust pipe). I had both bikes for many years and they served me both well, so it was a tough decision. However the advantage with the 1150 would be more power, injection (ok - also a disadvantage due to electronics), newer bike and a much (much!!!) better sitting position. Those were the factors which lead to the decision to go ahead with a R1150GS Adventure.

The next question was which one?
Early or late modelyear? How many km shall be ok? What extras are needed? Which gearbox is used? And so on and so on ….

Here are my few findings.
The differences between 2003 and 2002 models are those:
  • 2002 gearbox has wider wheels – better for sidecar usage
  • 2002 has one spark plug per cylinder, 2003 has two
  • Removal of ABS-II in 2002 does not require new front-mainbrakeunit, neither new brakes

On 24Apr, the decision was made: It will be a R1150GSA - MY02


My "new" GSA in May 2012

Additional thoughts from 23Jan13: I think it would have been easier and cheaper to get a R1150GS from Finland and take the Touratech 40l fuel tank (I really missed that). The Adventure 30l tank is not that big for a sidecar. The front fork was replaced and the rear suspension changed. In the end, I think all "Adventure" advantages were either removed or not advantage enough.
And some more thoughts from last week: The GS might only have a 40A generator, the GSA has always 50A version. The GS does not come with a GAN - gearbox. If a GS gearbox is used, the difference from short first gear to normal second gear might be rather big. With a GAN gearbox and long sixth gear, the difference between fifth and sixth gear is more manageable. So GSA was a good decision after all.

Some thoughts on the transmission ratio

The transmission ration appears crucial on such a journey - there are mountains to climb and rough terrain to be mastered and I might get stuck with the sidecar. Also fuel consumption needs to be watched. One advice which made sense to me was that the ratio can never be short enough. I decided to go with the GAN gearbox (short first gear), in combination with a rear-axle-drive from the R850GS (ratio 37/11 part number: 33112330973 or 33112330974 with ABS). The change from 150/70R17 to 175/75R15 has no impact to the ratio. In order to reduce fuel consumption, I change the sixth gear from the original short to a long version (The long/normal sixth gear is standard in other GS gearboxes).

In hindsight, the change towards the 850GS rear axle drive was an excellent decision. I recommend this for anybody who wants to go offroad with this monster. Also the change of the sixth gear had a significant impact on the fuel consumption.

Strengthen the rear support frame
The subframe at the GSA is known for its weakness and the internet offers several ideas what and where to strengthen the frame. I went to a local welding shop and they welded some extra support pieces to the rear frame. Of course I forgot the sample pics at home and my explanation what to do was a little vague with the result that the two pieces in the most front part collided with the air filter housing. So I flexed them away and it was fine :)


R1150GSA strengthen sub frame to avoid bending


R1150GSA strengthen sub frame

After one ride in lousy weather, the frame started to rust badly. I realized my selfpainting attempt did not succeed. I needed to take it to a real paint shop.

The next decisions - which boat and where to built it?

I looked at the following boats: Stern - RX overland, EZS Rally XC (maybe EZS Rally XC, Mobec ZeroGTO) and then it came: Mobec Enduro Cross - seemed perfect for our purpose :)


Mobec Enduro Cross and Zarges Alu box - could look like this...

Another major issue was to find a reliable company which can build the sidecar. I did not find any firm in Finland which would build sidecars as a profession. Most companies do it as a "hobby", some people built it by themselves, none of those options were feasible for me. So back to Germany - the land of sidecars and sidecar builders (it would be also easy with the language). I contacted many firms in Germany. Some told me instantly that they are busy, others were so kind and informed that they do not build such kind of sidecars. I also had a longish talk with Martin F. who explained me many things, gave me several good advices and helped me in making my decisions. In the end I needed to choose from two firms. Since one firm (Mueller-Gespanne) did respond to my emails and answered my phone calls, I went with Elsbeth and Peter. The other firm had a many days delays in answering emails and I could not reach the people by phone for days - so no thanx.

Back to the sidecar. Of course the Mobec boat needed a few modifications since we do not have a human passenger. Instead there will be three sweet little dogs and a need for plenty of storage room.


Sidecar frame


One 10l reserve canister could fit here?
In my previous sidecar, we needed to lift our girls always in and out of the boat. This was not a solution for the future. When I saw the Mobec boat, I got the idea to have a ramp like an aeroplane (like the one from Ryanair). The ramp is attached to the boat, and closes the boat so that the dogs cannot escape during riding. When the ramp is open, the dogs can use it to enter and climb out of the boat by themselves. The idea was realised with the modification that the ramp now folded so that it is longer and not too steep.


sidecar mounted on frame


Shortened boat and alu cases behind


Bringing the bike and first rough alignment


Bike with sidecar frame


Almost ready... only the boat is missing




The new extra-heavy-duty front fork


Done... well almost

During the long Finnish winter... planning continues as well as some other modifications like the rear-axle-drive, Xenon lights, day-driving lights, clutch, gearbox etc.


The winch could fit here...

In meantime the bike looked like this:


Bike during winter maintenance

Modifications - part I

Occasionally small mistakes (at least in the eye of the customer) might happen like these two:


1. One trouble spot - the alu case lid does not open much


2. These are potential spots to hang on to a rock when riding rough terrain

With all those items and a few small other ones (mounting the winch, improving the rear suspension), we went again to Müller Gespanne and stayed for almost two weeks there in order to fix them (It took so long because the frame needed to be re-painted). On the way to there, I noticed that our belts, which hold the big alu cases are not of good quality, so I got some proper ones for professional use (see also some earlier post).


Top view, finally found another place for drinking water


SilberWolf from front - ready to go


... and from the back - quite loaded ;)


Our precious cargo - three little monsters

Modifications - part II

Since I met Skippy again in Neumünster (she was there for her black belt exam), I decided to pop by Müller Gespanne again. The sidecar wheel did look a little bit out of line. Peter and Elsbeth told, that the load is quite heavy and in the end, we decided to change the spring at the sidecar suspension. They also noted that the rear suspension seemed not to be able to hold the load either and suggested to visit the firm which has done the rear suspension. So, off we went to visit a little town close to the dutch border.

Modifications - part III

Instead of going East, we went west and a few days later we were at this company. Pretty soon it became obvious that a much stronger rear shock needs to be used. The original option to "only" change the spring would have not been sufficient. Lucky for me, they told they were able to build one the next day. The rear shock came so late in the afternoon of the next day, that I was suppose to come the following day in the morning (good for us we had booked the hotel long enough).


Trying to fit the new shock...

However and for some strange reasons, this shock did not fit into my standard (and to my knowledge not modified) rear frame even though the same shock was built and installed into other GSs. Instead of having a day off and "I'll be back soon", I drove across the border to Netherlands to visit the shock building company myself and they could see what is the problem.


The same procedure again...

After a while of experimenting with different alternatives, the guys told me that they do not have a ready solution. Instead they will need to manufacture a special (extra long) version of the upper part of the shock, so that the new shock can be adjusted in various ways to adopt to the different load conditions of the hack. Now I need to wait (I really hope the rear shock comes before we hit Africa)...

I was not happy since I did not want to spend time this way and I had a feeling of wasting my time with this stuff

On a positive note, I must say that this was exactly the reason why we decided to tour first through Europe and not go straight to Africa: to drive around and remove the "Kinderkrankheiten" of our SilberWolf

~ Wolfi
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