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1Back to top Go down   K75S Wheel bearings Empty K75S Wheel bearings on Tue Dec 23, 2014 7:29 am

BooG

BooG
Platinum member
Platinum member
I am just after the spec for the front and rear wheel bearings for my '88 K75.
Anyone happen to have them to hand?
Thanks.

    

2Back to top Go down   K75S Wheel bearings Empty Re: K75S Wheel bearings on Tue Dec 23, 2014 8:50 am

Born Again Eccentric

Born Again Eccentric
Life time member
Life time member
BooG,

The standard size front wheel bearing for the K100 & K75 is 25mm x 47mm x 12mm (Haynes manual), however, the K75S changed to a three spoke wheel design from 1991 onwards and that seems to have a different size bearing on RHS (25mm x 47mm x 16mm). Don't know if you have the standard wheel of the 3 spoke type.

Some more details at:
https://www.james-sherlock.co.uk/component/virtuemart/?page=shop.browse&category_id=366

I bought a pair of wheel bearings for my K100 front wheel, but keep shying away from fitting them because I don't have a slide hammer or other puller to extract the old ones and no easy means of heating the wheel to 100 deg C to fit the new ones. Both Haynes & Clymer manuals talk of difficulties due to a very tight fit in the hub. Maybe this will be a job for my local bike shop when I need a new tyre!

The rear wheel has no bearings - it is bolted directly onto the flange of the final drive crown wheel. Providing it is mounted securely, any play in the rear wheel will be due to worn bearings in the final drive assembly itself and that's a different game altogether!


__________________________________________________
K75S Wheel bearings Uk-log10 K75S Wheel bearings Sco-lo15K75S Wheel bearings Eu-log10
                              Paul  K75S Wheel bearings 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

3Back to top Go down   K75S Wheel bearings Empty Re: K75S Wheel bearings on Tue Dec 23, 2014 11:33 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Go to www.realoem.com and search for your bike and for the appropriate page with the wheels you have on your model, Y spoke or three spoke. The catalogue will often show the industry standard number as well as the dimensions of the wheel bearings, left and right.


__________________________________________________

“Some people see things that are and ask, ‘Why?’. Some people dream of things that never were and ask, ‘Why not?’. Some people have to go to work...

~George Carlin

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

    

4Back to top Go down   K75S Wheel bearings Empty Re: K75S Wheel bearings on Tue Dec 23, 2014 3:35 pm

boxermetal

boxermetal
active member
active member
In the states the front wheel bearings are very inexpensive from a BMW dealer.

http://www.boxermetal.com
    

5Back to top Go down   K75S Wheel bearings Empty Re: K75S Wheel bearings on Tue Dec 23, 2014 7:12 pm

RicK G

RicK G
admin
admin
"I bought a pair of wheel bearings for my K100 front wheel, but keep shying away from fitting them because I don't have a slide hammer or other puller to extract the old ones"

The tubular spacer between the wheel bearings is located to centre by 2 thin metal collars.  If you put a large screwdriver through one bearing with the end about half way to the other and give a good heave sideways the thin collars will collapse and you can get at the bearing on the other side to knock it out, then knock the other out and straighten the collars and then I grind part of the tubular spacer away so that next time it doesn't need to bend the thin collars.


__________________________________________________
"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 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

6Back to top Go down   K75S Wheel bearings Empty Re: K75S Wheel bearings on Wed Dec 24, 2014 4:38 am

Born Again Eccentric

Born Again Eccentric
Life time member
Life time member
@RicK G wrote:"I bought a pair of wheel bearings for my K100 front wheel, but keep shying away from fitting them because I don't have a slide hammer or other puller to extract the old ones"

The tubular spacer between the wheel bearings is located to centre by 2 thin metal collars.  If you put a large screwdriver through one bearing with the end about half way to the other and give a good heave sideways the thin collars will collapse and you can get at the bearing on the other side to knock it out, then knock the other out and straighten the collars and then I grind part of the tubular spacer away so that next time it doesn't need to bend the thin collars.
Thanks Rick - I do keep considering the "brute force & ignorance" route. The bearings I want to change (only slight play in them) are in my spare front wheel but it still has a few 1000 miles of tread on the tyre and remains useable. Sods law says that if I start butchering the bearings, I'll need it as a spare and I'll regret it. 

I do like a challenge though and your description removes some of my ignorance from the equation.


__________________________________________________
K75S Wheel bearings Uk-log10 K75S Wheel bearings Sco-lo15K75S Wheel bearings Eu-log10
                              Paul  K75S Wheel bearings 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

7Back to top Go down   K75S Wheel bearings Empty Re: K75S Wheel bearings on Thu Dec 25, 2014 3:27 am

Norbrat

Norbrat
active member
active member
@RicK G wrote:The tubular spacer between the wheel bearings is located to centre by 2 thin metal collars.  If you put a large screwdriver through one bearing with the end about half way to the other and give a good heave sideways the thin collars will collapse and you can get at the bearing on the other side to knock it out, then knock the other out and straighten the collars and then I grind part of the tubular spacer away so that next time it doesn't need to bend the thin collars.

I've read this is another method to remove wheel bearings without a dedicated puller.

Get an expanding bolt/Loxin/Dynabolt and expand the end of it into the bearing.  Then use a punch to drift it out from the other side.

So for this size, you will need a 25mm Dynabolt.  Not sure how easily they are available.  Most hardware shops probably go no bigger than maybe 16mm? 

And a heat gun/paint stripping super hairdryer should give enough heat to heat up the hub to help release the bearing.

    

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