BMW K bikes (Bricks)


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Swedish.brick

Swedish.brick
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Hey all! First post here, bear with me.

I’m rebuilding my K100RS -84 and currently working on swapping the wheels. 

I wanted to swap the originals for K1200 wheels, but they are really hard to get hold of. So I managed to get myself a set of R1100S wheels for a good price.

Now to my problem. The original rear brake disc is 285mm in diameter, and the R1100 have a 276mm disc, which means that the calliper will have 9mm less disc surface to grip.

Will this be an issue? By just looking at it it doesn’t feel like it’s going to be. But wanted to make sure and check with you guys and see what you think. To make it work I will have to add some calliper spacers as well since it’s a different offset on the R1100S wheel.

I’ve searched a lot regarding this issue, but I can’t find any relevant information regarding the R1100S wheel which has the disc mounted on the wheel.


Thanks in advance!



Last edited by Swedish.brick on Tue Mar 01, 2022 10:29 am; edited 1 time in total

    

Two Wheels Better

Two Wheels Better
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Another naked K100, hence your phrase 'bare with me'. Are you cleverly hoping to uncover something new & untried in your build, or meaning to ask us to be patient with you as you learn? We can bear that.

The caliper meant for a larger diametre disc will shred the brake pads against the smaller disc with use, & probably look pretty amateur. Try sourcing a final drive cover that accepts a smaller Oilhead caliper/pads, R1100S wheel & disc spacing of your choice. Searching the forum (& asking the Google gods) will reveal several who have done this already. It will require careful internal shimming, & is added time & expense but more sound engineering.

An additional helpful item for the forum members is to place the year & model of your bike(s) in the signature line of your profile to avoid those who offer advice having to ask what you're working on.

Good luck with your project.


__________________________________________________
1977 R75/7-100, 1995 R100 Mystic, 1993 & 1996 K1100RS, 1993 K11/K12 Big Block, 2 x 1998 K1200RS, 2006 K1200R & 2009 K1300GT
    

Swedish.brick

Swedish.brick
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Sorry, but I can’t tell if you are being sarcastic or not. I sorted out the grammar problem at least.

The reason I said so was mainly because I have really tried to search and find a good solution, even with the almighty Google. I didn’t want to get flamed for my first post.

Anyway, thanks for the tip! That was actually my plan B. I don’t have to replace the whole final drive to a paralever right? Only the cover with the attachment for the smaller calliper from an oilhead? 

I will try searching again and see what this shimming you speak of is all about.

Oh, and my bike is a -84 K100RS, will get this in my signature

    

Dai

Dai
Life time member
Life time member
There was no sarcasm involved in TWB's reply at all - it was a play on words 'bare', 'bear' and 'naked'. Sometimes we forget that second-language English speakers may not get the joke.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

Swedish.brick

Swedish.brick
active member
active member
Allright, my bad Smile ! Yeah the language barrier is tricky sometimes. Even more so on the internet!

I appreciate all the help I can get!

    

Two Wheels Better

Two Wheels Better
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No sarcasm meant, merely a poor attempt at humour. And it was very early here.

The large bearing, seal & o-ring for Monolever & Paralever final drives are the same, so in theory these covers should be interchangeable. I can't recall which forum member, but he put together a wire-wheeled K100/K1100 using the final drive cover from an Oilhead. He was from Russia, as I recall.


__________________________________________________
1977 R75/7-100, 1995 R100 Mystic, 1993 & 1996 K1100RS, 1993 K11/K12 Big Block, 2 x 1998 K1200RS, 2006 K1200R & 2009 K1300GT
    

Swedish.brick

Swedish.brick
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Could also be the receiver that had poor understanding Wink ! 

That’s really interesting information thank you!

    

Gaz

Gaz
Life time member
Life time member
Here is the link to the story of the K1100 with the wire wheel conversion. Unfortunately most of the photos are not showing up on the thread so the owner may have removed them. The story may assist with your project.

K1100 wire wheel project


__________________________________________________
Gaz
1990 K75 6427509; 1987 R80G/S PD 6292136; 2010 G650GS ZW13381; 95 K1100LT 0232224
    

Swedish.brick

Swedish.brick
active member
active member
Thank you very much! I saw this video before, but I must have missed the part where he swaps the final drive cover.

    

Arlina

Arlina
Moderator
Moderator
Ehm... the rear wheel of thye R1100S is the same as for the K1100RS, and the disk can stay at the final drive.
Only need more spacers, or a complete K-16V rear and gearbox for the paralever.


__________________________________________________
Smaller brake disc, will it be an issue? Eu-log10  K1100RS/LT - R1200RT - R1100RS - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S - K1100RS - K75RT - K75C
    

Two Wheels Better

Two Wheels Better
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R1100S use the five spoke 17" stylised wheel as compared to the three spoke 18" K1100RS, or similar design three spoke 17" K1100LT. Not quite apples & oranges as far as fit goes but the taste will remind. Unless you're thinking 18" three spoke R1100R, Arlina...


__________________________________________________
1977 R75/7-100, 1995 R100 Mystic, 1993 & 1996 K1100RS, 1993 K11/K12 Big Block, 2 x 1998 K1200RS, 2006 K1200R & 2009 K1300GT
    

Ringfad

Ringfad
Life time member
Life time member
I found this very useful when fitting 5 spoke wheels to a k1100RS.

BMW motorcycle wheels (largiader.com)


__________________________________________________
Smaller brake disc, will it be an issue? Ir-log10

   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 60K Km     ;BMW;  K1100RS Black 1996       ;BMW; K1 Blue 1990 25K Miles
    

Arlina

Arlina
Moderator
Moderator
Two Wheels Better wrote:R1100S use the five spoke 17" stylised wheel as compared to the three spoke 18" K1100RS, or similar design three spoke 17" K1100LT. Not quite apples & oranges as far as fit goes but the taste will remind. Unless you're thinking 18" three spoke R1100R, Arlina...

Shocked  You're right in there.....
My mistake came in with the R1100S last year, just for an ordinairy service, but the S had the 3-spokes in it.
Since I don't like the S, didn't took notice that the wheels are wrong.
The only 4V R for me is the R1100RS  Smaller brake disc, will it be an issue? 1f60d


__________________________________________________
Smaller brake disc, will it be an issue? Eu-log10  K1100RS/LT - R1200RT - R1100RS - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S - K1100RS - K75RT - K75C
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Arlina wrote:
Two Wheels Better wrote:R1100S use the five spoke 17" stylised wheel as compared to the three spoke 18" K1100RS, or similar design three spoke 17" K1100LT. Not quite apples & oranges as far as fit goes but the taste will remind. Unless you're thinking 18" three spoke R1100R, Arlina...
Shocked  You're right in there.....
My mistake came in with the R1100S last year, just for an ordinairy service, but the S had the 3-spokes in it.
Since I don't like the S, didn't took notice that the wheels are wrong.
The only 4V R for me is the R1100RS  Smaller brake disc, will it be an issue? 1f60d
That woulda been a heap of extra work to fit older three spoker wheels to an R1100S model, most especially in the front. The front axle/bearings, brake disc mounting and caliper spacing to 'fork' leg are all distinctively different. Someone had some fun! Maybe they whacked an earlier R Telelever onto it.


__________________________________________________
1977 R75/7-100, 1995 R100 Mystic, 1993 & 1996 K1100RS, 1993 K11/K12 Big Block, 2 x 1998 K1200RS, 2006 K1200R & 2009 K1300GT
    

Arlina

Arlina
Moderator
Moderator
Haven't got a clue why and how he did it....... drunken


__________________________________________________
Smaller brake disc, will it be an issue? Eu-log10  K1100RS/LT - R1200RT - R1100RS - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S - K1100RS - K75RT - K75C
    

Swedish.brick

Swedish.brick
active member
active member
I’ve actually managed to get hold of a K1200RS paralever final drive with the correct cover and a Brembo calliper from a R1100RT to go with it. It’s in the mail as we speak. Will be interesting to see how it works out!

    

Two Wheels Better

Two Wheels Better
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Moderator
Swedish.brick wrote:I’ve actually managed to get hold of a K1200RS paralever final drive with the correct cover and a Brembo calliper from a R1100RT to go with it. It’s in the mail as we speak. Will be interesting to see how it works out!
Unfortunately 1997 through 1995 K1200RS (& GT) models use a similar pad set/caliper style as earlier K bikes so you'll have to rethink that one.


__________________________________________________
1977 R75/7-100, 1995 R100 Mystic, 1993 & 1996 K1100RS, 1993 K11/K12 Big Block, 2 x 1998 K1200RS, 2006 K1200R & 2009 K1300GT
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Two Wheels Better wrote:
Swedish.brick wrote:I’ve actually managed to get hold of a K1200RS paralever final drive with the correct cover and a Brembo calliper from a R1100RT to go with it. It’s in the mail as we speak. Will be interesting to see how it works out!
Unfortunately 1997 through 1995 K1200RS (& GT) models use a similar pad set/calliper style as earlier K bikes so you'll have to rethink that one. I reckon it's best to get an R1100 or R1150 cover so the calliper spacing tabs are correct.


__________________________________________________
1977 R75/7-100, 1995 R100 Mystic, 1993 & 1996 K1100RS, 1993 K11/K12 Big Block, 2 x 1998 K1200RS, 2006 K1200R & 2009 K1300GT
    

Swedish.brick

Swedish.brick
active member
active member
Hmmm, thats wierd. When I googled the partnumber ( 2 314 884 ) it shows that it fits bmw 1100 and 1150 aswell. This is an actual picture of the part I bought, it has the cutout in the cover that I need for the floating calliper:


Smaller brake disc, will it be an issue? C8efc710

    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Swedish.brick wrote:Hmmm, thats wierd. When I googled the partnumber ( 2 314 884 ) it shows that it fits bmw 1100 and 1150 aswell. This is an actual picture of the part I bought, it has the cutout in the cover that I need for the floating calliper:


Smaller brake disc, will it be an issue? C8efc710
The casting number 2 314 884 is not a good part number, but the part number(s) for this part are (33 11) 2 330 041 & older (33 11) 2 310 902. Both of these also fit Paralever final drives from R850, R1100 (but not RS) & various K1200RS & GT, as you are aware. The spacing you'll need is 90mm between bolt heads (all 10x25 or 26mm) and from the mounting boss on the final drive to the inner edge of the calliper it needs to be 23.5mm. We'll see when you get your parts. Cross yer fingers.


__________________________________________________
1977 R75/7-100, 1995 R100 Mystic, 1993 & 1996 K1100RS, 1993 K11/K12 Big Block, 2 x 1998 K1200RS, 2006 K1200R & 2009 K1300GT
    

Swedish.brick

Swedish.brick
active member
active member
Two Wheels Better wrote:
The casting number 2 314 884 is not a good part number, but the part number(s) for this part are (33 11) 2 330 041 & older (33 11) 2 310 902. Both of these also fit Paralever final drives from R850, R1100 (but not RS) & various K1200RS & GT, as you are aware. The spacing you'll need is 90mm between bolt heads (all 10x25 or 26mm) and from the mounting boss on the final drive to the inner edge of the calliper it needs to be 23.5mm. We'll see when you get your parts. Cross yer fingers.

Wow, impressive. You do know your K-bikes!

I will cross everything I have lol

    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Swedish.brick wrote:
Two Wheels Better wrote:
The casting number 2 314 884 is not a good part number, but the part number(s) for this part are (33 11) 2 330 041 & older (33 11) 2 310 902. Both of these also fit Paralever final drives from R850, R1100 (but not RS) & various K1200RS & GT, as you are aware. The spacing you'll need is 90mm between bolt heads (all 10x25 or 26mm) and from the mounting boss on the final drive to the inner edge of the calliper it needs to be 23.5mm. We'll see when you get your parts. Cross yer fingers.
Wow, impressive. You do know your K-bikes!
I will cross everything I have lol
We have a '99 K1200RS here at the shop to measure against, but not an Oilhead to compare it to at the moment. I have an Oilhead at home I can measure against later on.


__________________________________________________
1977 R75/7-100, 1995 R100 Mystic, 1993 & 1996 K1100RS, 1993 K11/K12 Big Block, 2 x 1998 K1200RS, 2006 K1200R & 2009 K1300GT
    

Swedish.brick

Swedish.brick
active member
active member
The seller said it was from a 97-01 K1200RS,
So hopefully it’s the right one…

    

Swedish.brick

Swedish.brick
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Allright, thought I’d do a little update. Had issues with getting the wrong parts etc, so that’s why it’s been a while.

The R1100S brembo calliper fitted nicely on the K1200RS final drive! When test fitting my R1100S wheel on the final drive along with the calliper everything fits like a glove! All I need to do is adding 5mm spacers to the calliper and it will be perfect.

But, when I began swapping the final drive covers with each other I immediately noticed another issue. The K1200 uses M10 bolts whilst my K100 uses M8. I need your advice here.

I could just use M8 bolts and bigger washers, or I could drill out the holes and thread new M10 ones. I think there is enough material to do that. But maybe that’s not necessary?

The K1200 cover is also slightly bigger on the outer diameter, 2mm. So there will be a little “lip”  on the outside. It fits nice and snug inside the final drive and I’m sure it will seal properly. They are both identical except that.


I didn’t manage to insert all the pictures in the same post. So I had to make several below.

Let me know what you think!


Smaller brake disc, will it be an issue? Ac52df10
Smaller brake disc, will it be an issue? Eb9c3d10
Smaller brake disc, will it be an issue? 977c8910



Last edited by Swedish.brick on Thu Mar 24, 2022 5:27 pm; edited 1 time in total

    

Swedish.brick

Swedish.brick
active member
active member
Smaller brake disc, will it be an issue? 69b0c110
Smaller brake disc, will it be an issue? Bf2cdb10
Smaller brake disc, will it be an issue? 5fe34e10

    

Swedish.brick

Swedish.brick
active member
active member
Smaller brake disc, will it be an issue? D2969810

    

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