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Old 01-13-2013, 07:46 PM   #1
kellymac530 OP
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FD part number ?

I am converting my R1100RT into a GS styled bike. I just put a GS rear shock in it and WOW, it raised the swingarm pivot bolt up by 2". That was an impressve growth in ground clearance.

But my question though is I had thought that all of the FDs were the same {other than ratios and tooth count} part number for the housing itself.

But then I noticed the rear FD pivot point being a bit more angled that originally, obviously a by product of the longer shock and adding angle to the swing arm. SO I went to A&S BMW website and got on the microfische to check the part number for the lower tie rod. Yep, that is a different part number as I suspected and they even had the length in the description...RT=385mm and the GS = 365mm...cool, that will fix the Fd angle.

But while I was there I just double checked the FD housing and that shows part number 33112330476 for the RT FD with ABS and the part number 33112314799 as the GS FD with ABS....what the heck?

What is the difference? Both are silver, both have abs, neither comes with the RT wheel hub....just the FD housing.
What am I missing?
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Old 01-13-2013, 08:06 PM   #2
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For sure one difference is the GS housing will have the standoffs for the mud guard fender that you RT wont have.
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Old 01-13-2013, 08:16 PM   #3
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The major difference is the gear ratio
The GS is 31/11
I believe the RT is 33/11
Then there is the mud fender ears as already mentioned.
Addendum:
Sorry I was wrong about the ratio - they should be the same except for the ears.
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Old 01-14-2013, 10:47 AM   #4
kellymac530 OP
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The different part numbers are not for the loaded final drive, just the housing, so gear ratio is not part of the equation, thanks for the input though.

So that is a relief, it sounds like it is just a mounting spot for the goofy rear mud flap that is out behind the tire. I will not be running that, so that is fine.

I just wanted to make sure that the difference was not in the casting where the strut rod connected to the FD.

The RT strut rod/tie rod whatever they call it {just "rod" in the fische} is 385mm on the RT and 365mm on the GS, so I was scared that the drive casting itself was shaped differently.

Can I just put a GS 365mm strut rod on the RT and correct that FD angle change when I put the longer shock in?

Does anyone know of an after market supplier for a better strut rod than the lame stamped steel rod?

I know I saw a nice aluminum round bar one in some thread, but I do not remember the brand and can not find it in a search here on on Google?

Thanks again folks, that puts my mind at a bit of ease.
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Old 01-14-2013, 11:03 AM   #5
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google paralever torque arm and you will find many...

Wunderlich/Rizoma, Vario, A&S has an adjustable...
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Old 01-14-2013, 11:16 AM   #6
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Thank you Rhubarb, I will.

PS, my favorite pie is Rhubarb. We had a friend that would make me a Rhubarb pie whenever I help her with chores around her house, single mom of 4 kids and a dirt bag Ex....she would put the candy Red Hots in the pie and they would melt in and add a cinnamon spicy flavor...it was pretty good that way..
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Old 01-14-2013, 11:50 AM   #7
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I found a few.
I like the billet, non adjustable ones like the Moto Techniques style.
It always cracks me up though when things cost more for certain models, even though there is less material in the part.

The R/RT/S model one is 385mm long and they have them on Ebay for $89.95 and free shipping. The same exact one but in 365mm for the GS {20mm less aluminum, thus less cost in materials} is $139.95 and free shipping...
$50.00 more for less material...I must be in the wrong business or I am bidding work wrong....More drywall, I charge more money...less drywall I charge less money...
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Old 01-14-2013, 12:53 PM   #8
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It has nothing to do with the materials and 100% to do with knowing what you want.
They know you want the GS one, so they marked it up! Had you wanted the RT version, it would have been more expensive. It's the internet elves that do this.

I've never actually had the pie, it's just a name that stuck to me 20+ years ago
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Old 01-14-2013, 02:46 PM   #9
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LOL

I know it is supply and demand...less demand for an RT arm, less money....more demand for GS....more money.

You really ought to try the Rhubarb....tart and sweet....yummy. NOT YOU of course.. the pie.

Thanks for the help folks.
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Old 01-14-2013, 04:31 PM   #10
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Kelly,

Why not have one of your machinist pals make a fancy alloy one from billet 6061 and anodize it??
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Old 01-14-2013, 04:48 PM   #11
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Quote:
Originally Posted by kellymac530 View Post
LOL

I know it is supply and demand...less demand for an RT arm, less money....more demand for GS....more money.

You really ought to try the Rhubarb....tart and sweet....yummy. NOT YOU of course.. the pie.

Thanks for the help folks.
Not real supply and demand, just that dumb luck that whatever you want today happens to be the expensive one... tomorrow it will be the cheap one.

I've never been called tart and sweet before
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Old 01-15-2013, 11:55 AM   #12
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The PIE is tart and sweet...lol. I do not know you well enough to call you anything

def, That is probably what I will do is weld something up or machine something. Looks simple enough.

I am thinking of a tie rod from a car styled rod. One end { the FD end} of a piece of aluminum tubing with a threaded hole and a bolt with a jamb nut welded to clevis, the trans end just a bushing fit into a block of aluminum.

$400 for the Wunderlich one seems a bit extravagant...but adjustability would be nice.
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