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Old 06-13-2006, 09:16 PM   #16
Rubber Cow
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Ouch! Howdy NoOb....welcome to Advrider!....for more of that, scroll down south and have a peek into JoMomma!
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Old 06-14-2006, 05:14 AM   #17
datchew
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he he he.
That's MR noob to you.

That's quite a bit of lowering on the front end.

Is the difference in length due to the (sorry bout the terminological shortfalls) upper tubes or the lower "female" housing?

If it's just the upper tubes that bolt into the steering hub (triple clamp?) then could you just swap out the lower end?

p.s. will pass on Jo Momma. It's pretty dark and smelly in there.
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Old 06-14-2006, 06:11 AM   #18
RocketJ
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1000 words

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Old 06-14-2006, 06:54 AM   #19
Rubber Cow
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Quote:
Originally Posted by RocketJ
[IMG][/IMG]
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Old 06-14-2006, 07:10 AM   #20
datchew
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RocketJ.

Can I then assume that was originally a standard gs?
Cause i thought the gs's had black frames and black cylinder guards and that the R100R had a silver frame and better brakes.
you've got some chrome on there, so i'm not sure.


What do you think about my question about which portion of the fork tubes account for the change in length and their interchangeability (is that a word?)
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Old 06-14-2006, 07:40 AM   #21
RocketJ
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Not mine

This is not mine. Just a picture. They came in both color combos. The GS forks Marzocchi . These are similar to the later K bikes, made by Showa. I doubt anything internal is interchangeable. I do know the GS sliders are longer and offset, assumably the stanchions are different, too. As are the triple clamps.
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Old 06-14-2006, 08:17 AM   #22
datchew
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Are the front wheels and bearing/shaft/etc the same size?

I'm gonna have to find someone around here with an r100r and compare.
hmmm... i think a guy in plant city has one.
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Old 06-14-2006, 08:55 AM   #23
rockt
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Quote:
Originally Posted by datchew
Are the front wheels and bearing/shaft/etc the same size?

I'm gonna have to find someone around here with an r100r and compare.
hmmm... i think a guy in plant city has one.

Front wheel is 18". Paralever is the same as GS, but with shorter suspension travel, the shaft is not as severly angled and therefore they are less prone to failure. In fact, I've never heard of an R100R's shaft failing, but then they are not as common as GS's and maybe people don't put as many miles on them. Mine was one of the best handling street bikes I've ever ridden - very neutral, stable and confidence inspiring. Brakes were great too.
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Old 06-14-2006, 03:34 PM   #24
Bernd Bauer
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dual disk

Hi,

Quote:
Originally Posted by datchew
on the brake upgrade note:

I've been wondering if it's possible to take the double rotor system, i.e., the entire front fork and all from an r100r and swap them out onto a gs.

Looks like that's be alot easier if you could get one that's being parted out.

I suspect if this was that easy, i'd have heard of it by now... but it never hurts to ask.
yes the forks are interchangeable. The total lenght of the R fork is a lot shorter, but the distance between steering head and axle is only around 1cm less.
Furthermore the GS has the axle "in front" of the fork. Whereas it is more centered on the R fork.
So with the R fork the geometry of the bike is somewhat changed.
But a local buddy has done this conversion to his GS and he likes it a lot.

He told me that the high speed stability is not affected but that it feels
more nimble in the twisties.

But of course you'll loose some fork travel.

Here you can see what I have done in order to improve the brakes of my GS:



I have modified a right hand fork slider so that I was able to install it on the
left side. Then I added two 4-pot Brembo calipers and a 15mm master cylinder. This setup work very well.


Regards

Bernd
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Old 06-14-2006, 03:53 PM   #25
Rubber Cow
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Quote:
Originally Posted by Bernd Bauer
Hi,



yes the forks are interchangeable. The total lenght of the R fork is a lot shorter, but the distance between steering head and axle is only around 1cm less.
Furthermore the GS has the axle "in front" of the fork. Whereas it is more centered on the R fork.
So with the R fork the geometry of the bike is somewhat changed.
But a local buddy has done this conversion to his GS and he likes it a lot.

He told me that the high speed stability is not affected but that it feels
more nimble in the twisties.

But of course you'll loose some fork travel.

Here you can see what I have done in order to improve the brakes of my GS:



I have modified a right hand fork slider so that I was able to install it on the
left side. Then I added two 4-pot Brembo calipers and a 15mm master cylinder. This setup work very well.


Regards

Bernd
Hi Bernd,
Welcome to AdvRider!
It's been a while since I've seen your name!
Cheers,
Jorge aka Rubber Cow
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Old 06-14-2006, 10:05 PM   #26
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Quote:
Originally Posted by Bernd Bauer
Hi,
Regards
Bernd
Hello Bernd

Been awhile. Welcome to advrider.
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Old 06-16-2006, 05:37 AM   #27
datchew
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Quote:
Originally Posted by Bernd Bauer
Hi,



yes the forks are interchangeable. The total lenght of the R fork is a lot shorter, but the distance between steering head and axle is only around 1cm less.
Furthermore the GS has the axle "in front" of the fork. Whereas it is more centered on the R fork.
So with the R fork the geometry of the bike is somewhat changed.
But a local buddy has done this conversion to his GS and he likes it a lot.

He told me that the high speed stability is not affected but that it feels
more nimble in the twisties.

But of course you'll loose some fork travel.

Here you can see what I have done in order to improve the brakes of my GS:



I have modified a right hand fork slider so that I was able to install it on the
left side. Then I added two 4-pot Brembo calipers and a 15mm master cylinder. This setup work very well.


Regards

Bernd


Hi there Bernd. That's a helluva brake setup. Got any pictures of you standing it up on the front wheel?

Can you offer a little more info on your conversion?
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Old 06-16-2006, 03:05 PM   #28
Bernd Bauer
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Quote:
Originally Posted by datchew
Hi there Bernd. That's a helluva brake setup. Got any pictures of you standing it up on the front wheel?

Can you offer a little more info on your conversion?
Well, it is more or less the same brake as used on the R100R.
BTW WUeDO offers a modified fork slider for this conversion, but it costs
an arm and a leg.

So the whole idea is to take a right fork slider and to install it on the left side
of the fork. As a result you can now add a second caliper.




Here you can see the sliders side by side:



As you can see the bores for the axle have a different diameter. So it has
to be rebored.

When this is done you can already install the slider, but the caliper would touch the spokes.
In order to get enough clearance between the spokes and caliper you can take off some
material (1 to 2mm) at the mounting points:



The last thing to address are the reflectors. Due to the new mounting position
the reflector is now on the inside (facing the wheel).
With the german TUeV this is a no go.
So I removed them on both sliders, filled the remaining holes and painted everything.




First I had two 48mm 2-pot Brembos installed in combination with the
15mm master cylinder. I was quite happy with this setup and
I have only upgraded to the 4-pot Brembos because over here in Germany
they are pretty cheap.
But they are definitly an improvement.

Regards

Bernd




(P.S.: Modifying a fork slider in the described way might sound a bit unsave to some of you.
But highly respected BMW specialist like Lottmann or Q-Tech
carry out the conversion exactly the same way. Of course you should not try this if you
don't have the proper tools or knowledge.)

Bernd Bauer screwed with this post 06-16-2006 at 03:19 PM
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Old 06-16-2006, 03:41 PM   #29
SOLO LOBO
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Bernd,

Great pictures and words, thanks for sharing !
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Quote:
Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 06-17-2006, 08:22 AM   #30
datchew
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Very nice. How did you attach the second rotor?
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