BMW GS Clutch life/gearing
1bmwmc
Posted 9/29/2017 10:31 PM (#95237)
Subject: BMW GS Clutch life/gearing


Member

Posts: 34
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Location: Gastonia NC
I have a 2005 BMW R1200GS with a CSM car attached. Great over all rig/workmanship etc.
However I am wondering about all the clutch slippage needed to get under way - especially with some one in the car ; in grass ; up hill etc. Any one know of any rear gearing options available - already have the auto rim/tire on rear - 165/80R15.
Any good or bad clutch life stories would be welcome too.

Thanks in advance from Gastonia NC where finally we have some nice fall weather. Riding to the Overland Expo in Asheville NC tomorrow. https://www.overlandexpo.com/updates/
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DRONE
Posted 10/1/2017 12:42 PM (#95248 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing



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Posts: 238
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Location: Tacoma, WA, USA

There are no gearing options for the 1200 other than replacing your GS gearbox with the lower-1st-gear "enduro" gearbox from a 2005-07 GS Adventure.  But that's a lot of money and work!

You can get a small improvement by swapping out your 165/80 for a 175/65 assuming you have the normal 4x15 car rim that Claude uses. This would reduce your effective gearing by 6%. This is the size I use. Another nice thing about this is that there is a much wider choice of tires in this size.  Now, it will cause your rear axle height to drop about 3/4". Maybe you can live with this. If not, consider swapping out your front 19" rim for a wider 17" rim from a R1200RT or similar bike. These rims are available on eBay. You can then switch to a 130/70-17 front tire which will drop your front axle height by 7/8" -- which levels out the rig. Again, this is what I've done with my 1200.

On the other hand, if you have Claude's steering mod installed, perhaps your front end is already a little droopy, in which case the 3/4" drop in the rear will be a welcome change.

Here's a side-on pic of my rig and you can see that it rides pretty level fore and aft--

 

I should point out that though I have a steering mod, I also have the taller Adventure-length shocks and I have made the DeDome modification to my telelever. all of which affects the way the bike sits.

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DRONE
Posted 10/1/2017 12:45 PM (#95249 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing



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Posts: 238
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Location: Tacoma, WA, USA
No matter what you end up doing, the clutch will eventually die a premature death. There's just no way a clutch designed for a 500-lb bike is gonna last long on a 1000-lb rig! The preferred replacement is the ceramic clutch sold by Touratech.
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1bmwmc
Posted 10/1/2017 1:16 PM (#95251 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing


Member

Posts: 34
25
Location: Gastonia NC
Thanks for your reply. I will probably just swap out the rear tire and ride. The previous owner says a ceramic clutch is already in place - GS had 29,000 on it when I purchased it. Guess it was a short clutch life !
Not concerned at all - not a problem till it becomes a problem.
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jaydmc
Posted 10/2/2017 11:41 AM (#95270 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing


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Posts: 1513
1000500
You could run the final drive out of a for Europe only R900 Police bike. Not sure what the ratio is.
Jay G
DMC sidecars
www.dmcsidecars.com
866-638-1793
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dholaday
Posted 10/3/2017 5:19 PM (#95280 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing



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Location: NoVA
As Jay said, for a 2005 R12GS you can install a final drive from an R bike - MaxBMW sells them and you will get a 3.0 ratio - I think the ratio on the 2005 12GS is 2.8 or so - 3.0 is quite an improvement. I had one on my old rig [installed by previous owner] and liked it a lot.

http://www.maxbmwmotorsport.com/r1200-30-final-drive-upgrade/

You should NEVER have to slip your clutch. As Claude would say, just put it in gear and go. My old rig also had a ceramic clutch [installed by PO] and even after 50k miles it could be grabby.

Some folks [DirtyDR for one] have achieved over 100k miles on the stock clutch. A lot depends on how you put on the miles - stop and go city traffic or long distance riding or [like DRONE} playing in the dirt. I have overt 35k on my current rig with stock clutch and no problems so far -

Duncan

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DRONE
Posted 10/3/2017 10:02 PM (#95284 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing



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Location: Tacoma, WA, USA
Duncan and Jay--I've never heard of this 3.0 FD before. Huh! Incredibly expensive, but I stand corrected--there IS an is option!

Duncan--burned out my stock clutch at 65,000. Gonna put in a ceramic one if Touratech ever starts exporting them again.
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dholaday
Posted 10/6/2017 5:21 PM (#95303 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing



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Location: NoVA
Yes new 3.0 final drives from MAX BMW are expensive - Elmer installed it on his rig - along with the ceramic clutch - before I bought the rig from him so I got them essentially free. But no one said sidecar rigs were inexpensive.

Duncan

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cycleman
Posted 10/6/2017 7:16 PM (#95305 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing


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I'm not sure about this, but can't you just buy the gear set and have it installed, shimmed etc in the bikes original housing. Might make it a bit cheaper. If it is shimmed and put together properly likely will last longer. As far as I know BMW has used the same housing in the various Airheads, OIlheads etc and just put the different gear sets inside. I'm lucky my old airhead is easy to change and relatively cheap, but even the lower gearing final drives are getting harder to find and folks want top dollars for them.
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DRONE
Posted 10/6/2017 11:53 PM (#95307 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing



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Posts: 238
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Location: Tacoma, WA, USA
Cycleman, I guess you didn't click on the Duncan's link. The $1533 option IS the cost to buy the gearset, shims and seals including $450 for labor. The gearsets for the airheads are totally different from the oilheads, which are totally different from the hexheads and camheads. And of course the wetheads are a whole 'nother animal! So, yeah, no bargain basement options here.
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dholaday
Posted 10/10/2017 10:39 AM (#95341 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing



Regular

Posts: 54
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Location: NoVA
Another option would be to chat with Anton Largiader in Charlottesville VA - he's a good guy and has a great reputation for his work on BMWs - including custom transmission/final drive gearing.

http://www.largiader.com http://vamotorrad.com


Duncan

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1bmwmc
Posted 10/14/2017 10:19 PM (#95387 - in reply to #95237)
Subject: Re: BMW GS Clutch life/gearing


Member

Posts: 34
25
Location: Gastonia NC
Yes I am very familiar with Anton Largiaders' work - some years back I had him switch out the gears in the final drive of an K1100RS - reinstalled final drive and never any concerns/problems at all.
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