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Thread: 86 K75 Forks, calipers and rotors on an 83 R100/T

  1. #1
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    86 K75 Forks, calipers and rotors on an 83 R100/T

    Consider the following:

    83 R100/T engine, frame, subframe, transmission and final drive.

    I have the following parts laying around, and I want to mate these to the R100 frame. Is it possible?

    86 K75 Brick front forks, calipers, rotors and axle (25mm)

    OEM BMW FRONT WHEEL HUB FOR 1988-1995 R100R, R100 MYSTIC, R100GS

    Does anyone know of any immediate problems I have not considered in lacing this 40-spoke hub to maybe an Akront rim, and mounting the whole shebang to the 83 R100? My obvious concern is if the spokes can clear the front brake calipers.

    For some of you, call 911 now before the stroke kills you.

  2. #2
    BMW VIKING
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    Quote Originally Posted by Dap_Spackled View Post
    Consider the following:

    83 R100/T engine, frame, subframe, transmission and final drive.

    I have the following parts laying around, and I want to mate these to the R100 frame. Is it possible?

    86 K75 Brick front forks, calipers, rotors and axle (25mm)

    OEM BMW FRONT WHEEL HUB FOR 1988-1995 R100R, R100 MYSTIC, R100GS

    Does anyone know of any immediate problems I have not considered in lacing this 40-spoke hub to maybe an Akront rim, and mounting the whole shebang to the 83 R100? My obvious concern is if the spokes can clear the front brake calipers.

    For some of you, call 911 now before the stroke kills you.
    Hi,
    I would love to put a spoke wheel on the front of this bike,
    It has a 1987 K75 forks and front wheel.
    Dean



    Last edited by BMW VIKING; 01-23-2011 at 09:19 AM.

  3. #3
    Registered User toooldtocare's Avatar
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    Nice, old school look. I love it.

  4. #4

    Beautiful bike, bad attitude

    No doubt you should be very proud of your bike.

    But we all have to battle the non riding public regarding loud bikes, like you proudly say yours is. You like waking the neighbors? Is this a joke? Are you serious?

  5. #5
    Registered User lmo1131's Avatar
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    The chrome on my /5 headers is shot and this looks like a great fix.

    What is the width of the exhaust wrap (2" ?), and how many feet of it did you need for the headers and cross-over? Did you spring for the $5 a piece "clamps" they offer or did you use "safety wire", etc.?
    "It is what you discover, after you know it all, that counts." _ John Wooden
    Lew Morris
    1973 R75/5 - original owner
    1963 Dnepr

  6. #6
    BMW VIKING
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    Quote Originally Posted by tshusband View Post
    No doubt you should be very proud of your bike.

    But we all have to battle the non riding public regarding loud bikes, like you proudly say yours is. You like waking the neighbors? Is this a joke? Are you serious?

    Waking the neighbors was just a figure of speech, I have a K bike thats very quiet, which I ride more than this one, so every once in a while l love to get this thing out and fire it up, it makes this 55 year old basterd feel alive,..I guess there's still a little rebel left in me.
    I'm not sure where you live, but my neighbors don't mind it.
    It's not like a ride it everyday.
    You must live in California

  7. #7
    BMW VIKING
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    Quote Originally Posted by Lmo1131 View Post
    The chrome on my /5 headers is shot and this looks like a great fix.

    What is the width of the exhaust wrap (2" ?), and how many feet of it did you need for the headers and cross-over? Did you spring for the $5 a piece "clamps" they offer or did you use "safety wire", etc.?
    I had a crappy looking set of headers too, so this $20 fix sounded good and doesn't look bad either. Yeh they are about 2" wide, it came with the stainless zip-ties, 25 feet I believe and I have some left over.
    The first time you run the bike it burns and smokes alot, but after about 15 minutes it clears up, it was also black when I put it on. I'm thinking all toll with shipping it was about $25.

  8. #8
    BMW VIKING
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    Quote Originally Posted by toooldtocare View Post
    Nice, old school look. I love it.
    Thanks Man!

  9. #9
    Registered User lmo1131's Avatar
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    So, black turned to white (more or less). I was thinking maybe the "natural" color might work. My /5 is black. Is there any "powdery" residue associated with them after the burn in?

    I've heard that rust can be a problem with header "tape". I guess that's just a reason to get out a pound it more often.
    "It is what you discover, after you know it all, that counts." _ John Wooden
    Lew Morris
    1973 R75/5 - original owner
    1963 Dnepr

  10. #10
    Registered User Anyname's Avatar
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    Going back to DAP Spackled's original post, the place I would look for guidance is the "All Balls Racing" bearing website. They have a database of the ID and OD of the steering head bearings for most motorcycles.

    https://www.allballsracing.com/index.php/forkconvertion

    I checked their table and it shows that both the K75 and R100 used the same steering head bearings. Your next step is to find out if the steering stems and yokes are of similar length and offset (from the stem to the tubes). I wouldn't be surprised if they were the same since the air head monos used K bike forks.

    If the stem and yokes don't fit, you could look for a set from an airhead mono to see if they worked any better.
    BMW R bike rider, horizontally opposed to everything...

  11. #11
    BMW VIKING
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    Quote Originally Posted by Lmo1131 View Post
    So, black turned to white (more or less). I was thinking maybe the "natural" color might work. My /5 is black. Is there any "powdery" residue associated with them after the burn in?

    I've heard that rust can be a problem with header "tape". I guess that's just a reason to get out a pound it more often.
    Yeh, I'm thinking I might of just got some cheaper stuff, because I've seen bikes where it didn't change color, I haven't noticed any residue at all.

  12. #12
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    Dean, the look of that bike nearly took my breath away. Fantastic.

    That is the look I am also working on now. Not exactly, of course, but very similar. I have the engine, transmission, frame and final drive (33/11) from an '83 R100/T. The engine is in the process of total rebuild. The frame has already been powdercoated gloss black.

    I have the entore ftont end from an '86 K75 --- forks, rotors, Brembo calipers, triple tree and axle. I have also gotten the hub from a R100R as previously stated. I want to lace it to an 18" rim and use a spare rear drum hub from a '78 R100RS laced to a new 18" rim.

  13. #13
    From MARS
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    I have a '93 R100R with an 18" front rim that I want to convert to a 19" rim maybe from an R1100GS. Maybe we can work something out.

    Tom

  14. #14
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    Absolutely. Let's discuss. Let me see if I can PM you.

  15. #15
    BMW VIKING
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    Quote Originally Posted by Dap_Spackled View Post
    Dean, the look of that bike nearly took my breath away. Fantastic.

    That is the look I am also working on now. Not exactly, of course, but very similar. I have the engine, transmission, frame and final drive (33/11) from an '83 R100/T. The engine is in the process of total rebuild. The frame has already been powdercoated gloss black.

    I have the entore ftont end from an '86 K75 --- forks, rotors, Brembo calipers, triple tree and axle. I have also gotten the hub from a R100R as previously stated. I want to lace it to an 18" rim and use a spare rear drum hub from a '78 R100RS laced to a new 18" rim.
    Thanks..yes, I like the way it turned out, but there is still a lot of stuff I want to change, I have a stainless rear rim and some spokes I want lace to a black powdercoat hub and some larger rubber back there, the tire I have on there now is way to skinny (looks like a front tire). I'm very qurious to see what you come up with mounting a spoke hub to those K75 forks

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