BMW K bikes (Bricks)


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1Back to top Go down   Wheel Balancing Empty Wheel Balancing Fri 04 Mar 2022, 16:12

jjefferies

jjefferies
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Hi All,
I'm in the throes of new tires for my Silver K75. At a recent club meet/thingey a comment was made that my rear was getting, ..well squared off. And they are over 10 years old... So I ordered up a set of Dunlop 404's. That took over a week to get delivered.  During the wait period I started painting the wheels/rims. But part of this is balancing the wheels. Now I have a wheel balancer that I made a while back. Works fine for front wheels But the rear is a challenge I've never quite overcome and I would like to solicit suggestions about how to either modify my wheel balancer  or how to go about it. These are K75 which I suspect is the same as a K100 rear wheel. And I'll post a photo of my wheel balancer - which BTW you can purchase for < USD $50. off EBay, but this one is home made.
Wheel Balancing Static10

    

2Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Fri 04 Mar 2022, 16:34

Laitch

Laitch
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Scroll down below the order form at this link. The photos may give you some ideas.


__________________________________________________
1995 K75 90,000 miles
    

3Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Fri 04 Mar 2022, 17:22

Point-Seven-five

Point-Seven-five
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If you already have the balancer, this will make it work with the rear wheel. 

https://www.wunderlichamerica.com/Wheel_Balancer_Adapter_Motorcycle_Workshop_Tools_58

A similar adapter was sold by Harbor Freight about 15 years ago.  It's been discontinued for a long time, but they occasionally come up on eBay.  That's where I got mine.

One tip, put the bare wheel on the balancer and find the heavy spot.  On my wheels it is somewhere other than the valve stem(usually 30-45 degrees away).  Mark that point on the wheel and orient the tire's light spot mark there rather than at the valve stem.  It will make balancing easier.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

4Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Fri 04 Mar 2022, 18:49

jjefferies

jjefferies
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Ooh, such interesting ideas. Just came from the garage. Seems I had something very much like the pieces shown in Laitch's link.  But smaller? But I ran off to the hardware store to see if I could get some parts that might make it fit. Hardware store closed at 5:00PM on the dot and I got there at 5:05. Spent the last hour seeing if my pieces would fit. Ah, they may/almost do. The cones did not quite come through the center hole in the rear wheel but it gives me hope that if I can figure out the other side... Then I thought what about the centering plugs that the K75 incorporates in bolting the rear wheel. (one to each bolt) Whee they also  fit, almost. All of which means I can have a cone on one side of the wheel but how to center the other side. Two cones, one on each side don't seem to work. And then there's Point-Seven-five's adapter. That would also probably work without any further head bonking on my part. You say they come up occasionally on eBay? Ok, I'll get the tires tomorrow and probably use their balancer but doing my own is also an option.

thanks guys.

    

5Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Fri 04 Mar 2022, 19:57

Rick G

Rick G
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I found that the K1100 RS rear fitted on a dynamic ballancer. It was 4.5in wide rim but the K100 Y Spoke is 2.75 so may not work too well but worth a try.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

6Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Fri 04 Mar 2022, 20:18

jjefferies

jjefferies
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RicK G wrote:I found that the K1100 RS rear fitted on a dynamic ballancer. It was 4.5in wide rim but the K100 Y Spoke is 2.75 so may not work too well but worth a try.
Just an aside, I've been assured that static balancing is just as good as dynamic but I'm not so sure. After one static balancing I popped the K75 up on the center stand and revv'ed it up to 80mph. It was jumping around quite a bit. I'm sure I would feel that on the Highway. I'll opt for dynamic if it's an option.

Any ideas on to what speed a dynamic balancer takes a wheel to balance it?

    

7Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Fri 04 Mar 2022, 22:36

Rick G

Rick G
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jjefferies wrote:
RicK G wrote:I found that the K1100 RS rear fitted on a dynamic ballancer. It was 4.5in wide rim but the K100 Y Spoke is 2.75 so may not work too well but worth a try.
Just an aside, I've been assured that static balancing is just as good as dynamic but I'm not so sure.

Any ideas on to what speed a dynamic balancer takes a wheel to balance it?
On a narrow rim yes it can be as good but using a dynamic ballance machine the wheel fits works heaps better than no ballance.
If you have access to a lathe you can make a 20mm shaft with two cones that hold the wheel true and lock into place.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

8Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Sat 05 Mar 2022, 00:13

jjefferies

jjefferies
Life time member
Life time member
RicK G wrote:
jjefferies wrote:
RicK G wrote:I found that the K1100 RS rear fitted on a dynamic ballancer. It was 4.5in wide rim but the K100 Y Spoke is 2.75 so may not work too well but worth a try.
Just an aside, I've been assured that static balancing is just as good as dynamic but I'm not so sure.

Any ideas on to what speed a dynamic balancer takes a wheel to balance it?
On a narrow rim yes it can be as good but using a dynamic ballance machine the wheel fits works heaps better than no ballance.
If you have access to a lathe you can make a 20mm shaft with two cones that hold the wheel true and lock into place.
Rick, you confused me a bit. My thought is that dynamic balancing is better than static balancing and both are better than no balancing. The big question I suppose does it make any difference in the long run as the wheel/tire  wears down, gets dinged and possibly changes the balance as a result.

    

9Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Sat 05 Mar 2022, 01:40

Rick G

Rick G
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admin
I was under the impression that static balance did not work the way it was done so dynamic or nothing. The speed that dynamic balance uses would be around 30MPH maybe less. I have had to redo the balance sometimes but usually it lasts the life of the tyre.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

10Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Sat 05 Mar 2022, 05:55

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I static balance my wheels and have had no problem with vibration even at speeds well above of 90mph.  Patience is the name of the game, it takes me about 10-15 minutes to get it where I'm happy. 

As I mentioned above, check the wheel first, I have found that the BMW wheels have heavy spots that don't line up with the valve stem.  Those heavy spots can make static balancing a royal pain in the ass.  I also tape the weights on the rim until I have enough weight positioned properly to make the balance perfect, then I stick them.  It makes it easy to start over if I'm having a problem.

Last point, treat the bearings for the balancer like gold.  The less stiction they have the, the better your balance will be.  If your balancer came with sealed bearings remove the dust covers and wash the grease out with brake cleaner.  I keep mine in a plastic bag and lube them with a drop of my wife's sewing machine oil when I use them.  This is important because of the cheap bearings that are used in a lot of balancers.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

11Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Sat 05 Mar 2022, 06:02

Laitch

Laitch
Life time member
Life time member
jjefferies wrote:After one static balancing I popped the K75 up on the center stand and revv'ed it up to 80mph. It was jumping around quite a bit. I'm sure I would feel that on the Highway. 
That's a dangerous technique and demonstrates little about the wheels. The motorcycle is designed to be operated at load. It's no wonder it was vibrating.


__________________________________________________
1995 K75 90,000 miles
    

12Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Sat 05 Mar 2022, 07:19

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Laitch wrote:
jjefferies wrote:After one static balancing I popped the K75 up on the center stand and revv'ed it up to 80mph. It was jumping around quite a bit. I'm sure I would feel that on the Highway. 
That's a dangerous technique and demonstrates little about the wheels. The motorcycle is designed to be operated at load. It's no wonder it was vibrating.
+1  Unless you really screwed up the balance of the wheel, what you are probably seeing is the slop and friction in the drive train, wheel bearings and the brakes.  All that stuff goes away under load.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

13Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Sat 05 Mar 2022, 07:42

Two Wheels Better

Two Wheels Better
Moderator
Moderator
I bought this Bikemaster stand from Tucker Rocky, a US motorbike parts distributor any bike shop can order from's, private label, for about US$50 several years ago. It has a balance bubble in its base for finding level on yer workbench or garage floor, and four adjustable legs to assist in the levelling. The four-bearing shaft has two Allen screw, adjustable cones for axle-type wheels, and the large aluminium ring below is the bolt on attachment for BMW four lug wheels (or five if you've a K1200RS/GT wheel). With a coupla boxes of either black or silver 7-gram (1/4oz) weights I can balance Airhead to K bike to 6" wide modern wheels, and I can use it as a trueing stand for spokies. A mate fabbed a five lug ring for balancing the latest BMW wheels and I borrow it when necessary. Point is, these balancers are still available from (now called) Tucker Powersports through any US-based motorcycle shop.
Wheel Balancing Bikema10


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

14Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Sat 05 Mar 2022, 08:15

Point-Seven-five

Point-Seven-five
Life time member
Life time member
$50!  That whad to be more than a couple years ago.  Only $129.95 now.  Still, a nice looking piece of kit.

https://bikemaster.com/bikemaster-wheel-balancer-and-truing-stand-151965.html


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

15Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Sat 05 Mar 2022, 09:13

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Point-Seven-five wrote:$50!  That had to be more than a couple years ago.  Only $129.95 now.  Still, a nice looking piece of kit.
https://bikemaster.com/bikemaster-wheel-balancer-and-truing-stand-151965.html
The receipt says $53.08 and it was bought four years ago when I was an area rep for Tucker. Ah, the good ol' days of cheap parts at near cost. It retailed then for $93.95, still cheap for its usefulness.


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

16Back to top Go down   Wheel Balancing Empty Re: Wheel Balancing Sat 05 Mar 2022, 14:17

MartinW

MartinW
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Homemade one made out of a scrap piece of aluminium beam, 4 bearing a mate gave me, and piece of straight steel bar. The cones were machined up in my ancient lathe, one cone is stepped so it can do both front and rear. In order to reduce friction the bearing seals and grease were removed and it is now lubricated with Tri Flo PTFE. The unit mounts onto two saw horses. After SSD, Mick and I changed SSD's tyres we balanced both his wheels easily the only problem was that we had to turn off the garage fans as the wheel kept on rotating. We fitted my Shinko on Friday and balanced it using two lots of 15 gram weights opposite each other. The previous Michelin Pilot Activ balanced dynamically by the tyre used 11 weights totalling 77 grams. When I get my front which is back ordered  I'm going to get them dynamically balanced and then check them with the static balancer and compare the result.
Regards Martin.
Wheel Balancing P3060012


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1992 K75s
    

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