BMW K bikes (Bricks)

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1Back to top Go down   Paralever bearing replacement Empty Paralever bearing replacement on Thu Jun 07, 2012 7:46 pm

mr grumpy

mr grumpy
Silver member
Silver member
Does anyone have any experience of this modification?

http://rubberchickenracinggarage.com/bushings.html

The basic premise seems sound, i.e. a roller bearing is designed for rotation not oscillation, but is the OE arrangement really that much of a problem? I bought my paralever 100RS 16v just a week ago, so I don't have any personal experience yet.


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K100RS 16v
    

2Back to top Go down   Paralever bearing replacement Empty Re: Paralever bearing replacement on Thu Jun 07, 2012 7:48 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
When Paralevers were commonly in use as a current item in K Bikes, Oilheads and etc, I used to stock about twenty of those tiny sealed bearings at the shop...


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"It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts."

Arthur Conan Doyle
1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '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  - all of the Beemers in my life I can recall, owned still or sold on.
    

3Back to top Go down   Paralever bearing replacement Empty Re: Paralever bearing replacement on Thu Jun 07, 2012 9:05 pm

RicK G

RicK G
VIP
VIP
There has been a lot of talk on other forums about the pros and cons of them.
Everything put there doesn't last well and rubberchickens gear seems to wear as much as others. The big problem is that a larger diameter bearing is needed but the room isn't there.
Those bearings are 32mm OD, if a 46mm bearing was used double the strength is obtained.
BMW just didn't get it right this time.


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"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

4Back to top Go down   Paralever bearing replacement Empty Re: Paralever bearing replacement on Fri Jun 08, 2012 6:47 pm

mr grumpy

mr grumpy
Silver member
Silver member
So should I conclude that the only reliable course of action is a regular strip and lube? It does rather negate the perceived maintenance advantages of shaft drive, but I supose that it is a price worth paying for my reinvigorated BMW habit. Thanks for the tips.


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K100RS 16v
    

5Back to top Go down   Paralever bearing replacement Empty Re: Paralever bearing replacement on Fri Jun 08, 2012 7:37 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
The bearings are sealed on both their sides so "maintenance is not required". Just check them every so often for wear which will be a noticeable side to side play when grasping the back wheel and swingarm and hoisting it to and fro, while the bike's on the centre stand. A small amount of play at the bearings will translate to something you can feel at hand there. I have seen where the large Allen bolt flange has almost siezed to the swingarm and requires replacement as well. They are under a lot of torque.

I think this bearing taking a whole heap of load is an issue but when you add up how many hundreds of thousands of Paralever-equippped bikes there are running round successfully for all these years - since the Airhead R100GS/PD! - it is not too big a deal. Change the final drive oil using a quality hypoid GL5 gear oil, then go for a long, enjoyable ride. There'll be never a chain & sprockets to adjust or clean or change ever again.


__________________________________________________

"It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts."

Arthur Conan Doyle
1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '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  - all of the Beemers in my life I can recall, owned still or sold on.
    

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