BMW K bikes (Bricks)

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1Back to top Go down   K100 Upper Triple Tree on K75 Empty K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 3:47 am

zach_ross

zach_ross
Silver member
Silver member
Does anyone know if you can do a direct swap from a K75 Upper Triple to a K100 Upper triple? I have a 87 K75S and am looking to replace the upper triple with one from a k100.


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Silver 1987 K75S
    

2Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 4:12 am

RicK G

RicK G
VIP
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K75 forks are 41mm K100 are 41.3mm. It is usually considered that it is not an easy job as you cant tighten the clamping bolts enough to hold properly.
Why would you want to put K100 clamp on a K75.  The K75 runs so smooth that the rubber mountings would serve no purpose and it turns the handlebars to jelly.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

3Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 4:18 am

zach_ross

zach_ross
Silver member
Silver member
@RicK G wrote:K75 forks are 41mm K100 are 41.3mm. It is usually considered that it is not an easy job as you cant tighten the clamping bolts enough to hold properly.
Why would you want to put K100 clamp on a K75.  The K75 runs so smooth that the rubber mountings would serve no purpose and it turns the handlebars to jelly.


I have mounted clip-ons so the handlebar mounts are not necessary. I was under the impression that the forks on K75S are 41,3mm, also noticed that my 41mm clip-ons were not a perfect fit. Correct me if I am wrong


From one of your earlier posts

K100 Upper Triple Tree on K75 Bmw_k_10

Seems as though 1987 K75S has same fork diameter as K100 until the late 80's


__________________________________________________
Silver 1987 K75S
    

4Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 4:49 am

RicK G

RicK G
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Would you give me a link to that post as I can't ever remember seeing that document and I certainly haven't got it on my computer. Please don't get offended I am simply interested to know where it has come from.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

5Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 4:52 am

zach_ross

zach_ross
Silver member
Silver member
@RicK G wrote:Would you give me a link to that post as I can't ever remember seeing that document and I certainly haven't got it on my computer. Please don't get offended I am simply interested to know where it has come from.

No problem!

http://www.k100-forum.com/t6919-k75-forks


__________________________________________________
Silver 1987 K75S
    

6Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 5:24 am

Inge K.

Inge K.
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It seems like it have been too much smoking lately, Rick.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

7Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 5:34 am

RicK G

RicK G
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I would say that I got rid of that chart as possibly unreliable because as you can see by reading more of that thread there were many contradictions. That's best guess but when I get a chance I will have a look back through my backups.
Any how back to the original subject if the forks are the same diameter they will exchange OK but if not there is a problem with getting the clamps to tighten up enough.
One of the big problems I find is that there is so much published over the years, much of it has some contradictions so what is correct and what is wrong is very difficult to separate.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

8Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 5:36 am

RicK G

RicK G
VIP
VIP
@Inge K. wrote:It seems like it have been too much smoking lately, Rick.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

9Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 5:41 am

zach_ross

zach_ross
Silver member
Silver member
Clear as mud . . . Shocked so as long as my forks are 41,3mm the upper triple from a similar year should work?


__________________________________________________
Silver 1987 K75S
    

10Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 6:24 am

RicK G

RicK G
VIP
VIP
Ask Inge he's on line.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

11Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 7:08 am

Inge K.

Inge K.
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I don't think it would fit, because of the different bearing adjustement parts,
then you also must change the lower triple and the bearing adj. parts.

The 75 also have a steering damper at the stem which isn't present at the K100,
it might be some differences caused by this also.

BTW. Welcome to the madhouse.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

12Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 7:58 am

zach_ross

zach_ross
Silver member
Silver member
@Inge K. wrote:I don't think it would fit, because of the different bearing adjustement parts,
then you also must change the lower triple and the bearing adj. parts.

The 75 also have a steering damper at the stem which isn't present at the K100,
it might be some differences caused by this also.

BTW. Welcome to the madhouse.

Could you clarify which bearing adjustment parts you mean? As far as I can see the four things that need to match on the upper triple are; 1&2. fork distance and diameter, and 3&4. the center yolk hole and countersink depth for that. As long as those match up wouldn't it work?  scratch


__________________________________________________
Silver 1987 K75S
    

13Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 8:13 am

Inge K.

Inge K.
VIP
VIP
K75:

K100 Upper Triple Tree on K75 K7511



K100:

K100 Upper Triple Tree on K75 K10012


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

14Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 8:30 am

zach_ross

zach_ross
Silver member
Silver member
@Inge K. wrote:K75:

K100 Upper Triple Tree on K75 K7511



K100:

K100 Upper Triple Tree on K75 K10012

Strange that they show it like that, I have mounting brackets for the handlebars on my upper tree...


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Silver 1987 K75S
    

15Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 8:42 am

Inge K.

Inge K.
VIP
VIP
@zach_ross wrote:
Strange that they show it like that, I have mounting brackets for the handlebars on my upper tree...

They probably did smoke now and then at the drawing departement, too.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

16Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 9:01 am

RicK G

RicK G
VIP
VIP
The only thing that will prevent a changeover is, if the thread on #4 on both drawings is different and AFAIK they are the same.
I think Crazy Frog has a K75 top yoke on his K100 solo.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

17Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 9:27 am

Inge K.

Inge K.
VIP
VIP
I think that the inside dia. on the knurled adjuster is different, and then it is a
stud on top and bottom of it at the K75...which goes inside the triple plate at
the top, and between the stem and the bearing at the bottom.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

18Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 9:29 am

ReneZ

ReneZ
Life time member
Life time member
Seeing the names under that sheet with fork information it must have come from Flyingbrick.de.

Maybe the originators have an updated version? I think both Derbonner and Zonnenpfeile are members here (under different names Very Happy )


__________________________________________________
Greetings from Florida! Having a 'new' K  :cyclops:    Surprised-o: 

Rene


BMW K100 - 1985 (0030029) K100 Upper Triple Tree on K75 Rain
BMW K1200GT - 2003 (ZK01223)
    

19Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 9:46 am

Inge K.

Inge K.
VIP
VIP
Both derbonner and zonenfeile use the same names on this forum...........
What is wrong with the list?........I think it's the same that is found on FB today.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

20Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 3:07 pm

Inge K.

Inge K.
VIP
VIP
Zachry!
After a bit more studying it looks like it shouldn't be any problem for you to use a K100 upper triple.
The early K75C using the same parts as the K100, but the same upper triple as the other K75 models with a F&S fork.

Which means that the protrusion at the top and bottom of the knurled adjuster nut later F&S K75's must have the same diameter as the top of the K100 steering stem.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

21Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 3:48 pm

zach_ross

zach_ross
Silver member
Silver member
@Inge K. wrote:Zachry!
After a bit more studying it looks like it shouldn't be any problem for you to use a K100 upper triple.
The early K75C using the same parts as the K100, but the same upper triple as the other K75 models with a F&S fork.

Which means that the protrusion at the top and bottom of the knurled adjuster nut later F&S K75's must have the same diameter as the top of the K100 steering stem.
Thanks Inge and everyone else for your help, I will order a triple tree upper and see if it fits. That is if there isn't one for sale in the forum?


__________________________________________________
Silver 1987 K75S
    

22Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 3:53 pm

Inge K.

Inge K.
VIP
VIP
Try Duck: http://kbikeparts.com/

Motorworks  have used parts, I'll guess the postage would be cheaper.

Why not try a advertisement on "blocket".


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

23Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 7:16 pm

ReneZ

ReneZ
Life time member
Life time member
@RicK G wrote:I would say that I got rid of that chart as possibly unreliable because as you can see by reading more of that thread there were many contradictions.

There you go Inge.


__________________________________________________
Greetings from Florida! Having a 'new' K  :cyclops:    Surprised-o: 

Rene


BMW K100 - 1985 (0030029) K100 Upper Triple Tree on K75 Rain
BMW K1200GT - 2003 (ZK01223)
    

24Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Mon Nov 17, 2014 7:33 pm

Inge K.

Inge K.
VIP
VIP
Haven't seen any, could be my glasses....


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

25Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Wed Nov 19, 2014 7:16 am

AL-58

AL-58
Life time member
Life time member
I've got a K75s top triple clamp on my K100 sidecar.  Had one on the last K100 sidecar too.  Never had any problems fitting them.  I couldn't tell you what year, I only ever looked for a 75s triple clamp. Much more direct steering for the sidecar.

Al


__________________________________________________
'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

K100 Upper Triple Tree on K75 K-dogs10
    

26Back to top Go down   K100 Upper Triple Tree on K75 Empty Re: K100 Upper Triple Tree on K75 on Sat Dec 27, 2014 7:38 am

zach_ross

zach_ross
Silver member
Silver member
Well now I have fit a top triple tree from a 1985 K100 on my 1987 K75 S, no problems fitting it at all. So good to know for future reference.

Thanks for all the tips and help.


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Silver 1987 K75S
    

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