BMW K bikes (Bricks)

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duck

duck
Life time member
Life time member
Why not just make the wheel hub a little thicker?


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

chris846

chris846
Life time member
Life time member
Or ride a bit closer to the wheel...


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The Longest Lunch
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
At a quarter to six in the AM I'm usually picking lint from me belly button, aka, navel gazing.


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1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '96 K1100RS, '09 K1300GT, '13 R1200RT-P, '95 R100 Mystic & '77 R75/7.

    

duck

duck
Life time member
Life time member
Is your K-Pox in remission?


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Only this weekend while moving house cross town. But already I'm imagining what to do with the added space of a full size garden shed made from timber with a sturdy floor. I could hang wheel shims over the double doorway like some upturned horseshoe good luck charm.


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1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '96 K1100RS, '09 K1300GT, '13 R1200RT-P, '95 R100 Mystic & '77 R75/7.

    

BobT

BobT
Life time member
Life time member
Are you sure that all K bikes have one?

    

duck

duck
Life time member
Life time member
All of mine do.  Not sure about 1200s and later models.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

robmack

robmack
Life time member
Life time member
Interesting question. It seems reasonable that the BMW engineers would know the required offset to get good handling so they'd build that into the dimensions of the parts. A shim would be needed if they required two different offsets, but such was not the case for the classic K's. Maybe the shim helped to prevent the wheel from seizing on the final drive, in case it oxidized (i.e. ease of maintenance)? I don't have an answer to your question Duck.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Both my K1200RS and the GT version used shims, but I note the latest series (K40) do not as they mount to a splayed steel flange - which were originally alloy but were recalled.

I was never able to get a viable answer from a BMW techy when I worked for the dealership system and sat next to their gurus in classes or at mealtime. It was often one of the questions asked of them, along with K bikes smoking and Oilhead surging (early to mid-'90s). Mainly I heard it was to reduce "fretting" between the metals...but that opens up a whole new line of questions regarding the millions of other vehicles which don't require it.

Here's a link to a discussion from our friends at BMWMOA

It will likely remain a mystery like how when I wear a white t-shirt all day I still get black lint in there!


__________________________________________________

1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '96 K1100RS, '09 K1300GT, '13 R1200RT-P, '95 R100 Mystic & '77 R75/7.

    

prince

prince
Silver member
Silver member
@Two Wheels Better wrote:Both my K1200RS and the GT version used shims, but I note the latest series (K40) do not as they mount to a splayed steel flange - which were originally alloy but were recalled.

I was never able to get a viable answer from a BMW techy when I worked for the dealership system and sat next to their gurus in classes or at mealtime. It was often one of the questions asked of them, along with K bikes smoking and Oilhead surging (early to mid-'90s). Mainly I heard it was to reduce "fretting" between the metals...but that opens up a whole new line of questions regarding the millions of other vehicles which don't require it.

Here's a link to a discussion from our friends at BMWMOA

It will likely remain a mystery like how when I wear a white t-shirt all day I still get black lint in there!
Were the K wheels used on other models like the R? That might explain it.


__________________________________________________
Paul
1984 Honda V65 Magna
1985 BMW K100RT
2011 BMW K1600GTL (gone)
2018 BMW K1600GTL
    

duck

duck
Life time member
Life time member
The exact same spacer was user on R bikes of the era: R80, R100 and R1100.

There must be some technical reason for it.  (I'll bet Ingepedia would know. Crying or Very sad)


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
@duck wrote:The exact same spacer was user on R bikes of the era: R80, R100 and R1100.
As well as R850/R1150, all models, and the R1200C & CL. The whole three ring circus. Step right up, we don't know what good you're doing, but we'll keep you out of comfort you might know what you're doing.

Yep to Prince, many wheels and final drives interchange 'tween K & R, although I'm not clear there's an answer there.


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1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '96 K1100RS, '09 K1300GT, '13 R1200RT-P, '95 R100 Mystic & '77 R75/7.

    

jbt

jbt
Silver member
Silver member
@duck wrote:The exact same spacer was user on R bikes of the era: R80, R100 and R1100.
No, not on R80 nor R100, because they had a drum brake wheel huband it would be almost impossible to fit the spacer with no access to it.
I suppose that this spacer allows a good share of pressure on the bevel drive.
But I have some old and confused reminds of other explanations red many years ago in technical notes:
- frames were made by Verlicchi in Italy, with misalignment issues: this spacer was a way to cope with by installing, removing or doubling it.
- It was added to counter the gyroscopic effect of the engine.
No tracks; no clues...just old reminds.

    

duck

duck
Life time member
Life time member
Oops! My bad. I was just going by the ETK (since I know zilch about Rs) and misread.  It was the R850s and R1100s that used the same spacer.  The drum braked K75Cs and standards didn't use the spacer either.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

15Back to top Go down   Why do all K bikes have a spacer between the rear wheel and final drive? Empty Spacer on Mon Apr 08, 2019 9:57 pm

daveyson

daveyson
Silver member
Silver member
So that wheel tracking is adjustable?

Normally only relevant during accident repairs.


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11/1985 bmw k100rt (late model)  Vin. 0090567
    

MarcS

MarcS
Silver member
Silver member
I lost my shim while doing repairs at xmas time, my Great Danes decided to have a punch up in the shed and sent shit flying everywhere . I ended up putting the bike back together without it and have ridden it ever since. There seem s to be no difference. I found it buried in the dirt of the shed floor last week so I will put it back in but I feel nothing better or worse with or without.


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K100rt ex plod bike 5/1990.



I have no problem with authority. Just some of the morons that are paid to enforce it.
    

17Back to top Go down   Why do all K bikes have a spacer between the rear wheel and final drive? Empty Spacer on Mon Apr 08, 2019 10:36 pm

daveyson

daveyson
Silver member
Silver member
The small difference wouldn't be noticeable, but over thousands of Kays maybe a little more tyre wear.


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11/1985 bmw k100rt (late model)  Vin. 0090567
    

duck

duck
Life time member
Life time member
@daveyson wrote:The small difference wouldn't be noticeable, but over thousands of Kays maybe a little more tyre wear.

I think lack of a spacer might cause the rear tire to rub on the swing arm of a K1, K100RS4V or K1100RS.  Those bikes have very little clearance for the right side of the rear tire.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Big Block has a Paralever rear end with the 5x17 K1200RS wheel & 170/60ZR17 tyre and there's about 3 or 4mm clearance without the shim. I didn't use it because there is a smidgen too much offset with it in place. It clears, that works for me.


__________________________________________________

1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '96 K1100RS, '09 K1300GT, '13 R1200RT-P, '95 R100 Mystic & '77 R75/7.

    

20Back to top Go down   Why do all K bikes have a spacer between the rear wheel and final drive? Empty Spacer on Mon Apr 08, 2019 11:14 pm

daveyson

daveyson
Silver member
Silver member
Or time for the Burt Munro precision technique.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
    

beachcomber550

beachcomber550
active member
active member
@Two Wheels Better wrote:Both my K1200RS and the GT version used shims, but I note the latest series (K40) do not as they mount to a splayed steel flange - which were originally alloy but were recalled.

I was never able to get a viable answer from a BMW techy when I worked for the dealership system and sat next to their gurus in classes or at mealtime. It was often one of the questions asked of them, along with K bikes smoking and Oilhead surging (early to mid-'90s). Mainly I heard it was to reduce "fretting" between the metals...but that opens up a whole new line of questions regarding the millions of other vehicles which don't require it.

Here's a link to a discussion from our friends at BMWMOA

It will likely remain a mystery like how when I wear a white t-shirt all day I still get black lint in there!

Yes that's the reason why.

    

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
@beachcomber550 wrote:
@Two Wheels Better wrote:Both my K1200RS and the GT version used shims, but I note the latest series (K40) do not as they mount to a splayed steel flange - which were originally alloy but were recalled.

I was never able to get a viable answer from a BMW techy when I worked for the dealership system and sat next to their gurus in classes or at mealtime. It was often one of the questions asked of them, along with K bikes smoking and Oilhead surging (early to mid-'90s). Mainly I heard it was to reduce "fretting" between the metals...but that opens up a whole new line of questions regarding the millions of other vehicles which don't require it.

Here's a link to a discussion from our friends at BMWMOA

It will likely remain a mystery like how when I wear a white t-shirt all day I still get black lint in there!

Yes that's the reason why.

These are quite useful.... https://www.amazon.co.uk/Gift-House-Belly-Button-Brush/dp/B000AMJX5G


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1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 98,780 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 32,600 miles
    

88

88
Life time member
Life time member
On my bikes the spacer* sits on the seat lol!


* (Irish slang for Space cadet!!)


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Why do all K bikes have a spacer between the rear wheel and final drive? Ir-log1188....May contain nuts!Why do all K bikes have a spacer between the rear wheel and final drive? Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

Bike: K100LT 1988. 0172363. AKA the Bullion Brick! Mods: k1100 screen and stands.
K1: 1990. 6374189. Custom Stealth Black paint.
    

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