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Normal Topic 120/90-18 rear spacer (Read 99 times)
wilcom
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120/90-18 rear spacer
10/29/18 at 20:20:00
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I just removed a 120/90 from the rear of my 1984LS and I am going back with a 110/90.

Reading in the archives  leads me to believe that I should have a "top hat" spacer, and that that spacer replaced the standard top hat spacer giving me the extra clearance that I needed t5o clear the swing arm.


I whipped out the Clymers and the rear wheel blowup has nothing that looks like a top hat. When I view the rear wheel I see the Thrust Sleeve with the Oil Seal surrounding it on both sides.


Where should I look for that spacer that should have gone in when the PO went with the 120/90?
  

rearwheel.jpg ( 89 KB | 1 Download )
rearwheel.jpg
rearwheel2.jpg ( 92 KB | 2 Downloads )
rearwheel2.jpg

Joe Wilkerson
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Tony Smith
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Re: 120/90-18 rear spacer
Reply #1 - 10/29/18 at 21:07:02
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On the R65 the "top hat" is on the drive side only, pressure for the non-drive side being provided by the stepmachined into the axle.

Lookign at your wheel it appears to have a perfectly stock "top hat" fitted to the drive side.

Some 120/90s will fit without requiring to be spaced, also the LS wheel is wider than the snowflake and the wider rim means that there is less of a "balloon" in the tyre when fitted and aired up.
  

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Re: 120/90-18 rear spacer
Reply #2 - 10/29/18 at 21:31:15
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The top hat spacer or "sleeve" as BMW calls it
Is what the seal rides on
The rim of it is under the seal
You normally remove the seal in order to get it out
I always at least pull the bearings out and inspect them at tire changes and then replace the seal

The standard one is 9.2 mm and the wide one is 11.7 mm
  

Wheel.PNG ( 966 KB | 1 Download )
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wilcom
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Re: 120/90-18 rear spacer
Reply #3 - 10/29/18 at 21:54:51
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Tony Smith wrote on 10/29/18 at 21:07:02:
Some 120/90s will fit without requiring to be spaced,

Mrclubike wrote on 10/29/18 at 21:31:15:
The top hat spacer or "sleeve" as BMW calls it
Is what the seal rides on


Thanks Tony & Mrclubike for the information. If it looks standard to you I'll bolt it back together and give it a go.
  

Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA

Present:
1984 BMW R65LS "Herr Head"
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1980  R65          
1982 R80RT 
1974 R90/6     
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georgesgiralt
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Re: 120/90-18 rear spacer
Reply #4 - 10/30/18 at 01:36:49
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Bear in mind that the non drive side also have a spacer. This one is (on snowflakes rim) same size as the one on the front wheel.
  
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Barry
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Re: 120/90-18 rear spacer
Reply #5 - 10/30/18 at 05:44:05
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If the wider spacer had been fitted for a long time you should see a step in the wear pattern of the splines as the wider spacer reduced spline engagement by 1.5mm
  

Barry Cheshire, England 79 R45
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Re: 120/90-18 rear spacer
Reply #6 - 10/31/18 at 17:45:25
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If a longer spacer has been installed on the drive spline side, you will have a larger gap between the final drive case and rim .
  

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wilcom
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Re: 120/90-18 rear spacer
Reply #7 - 10/31/18 at 20:24:17
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Bob_Roller wrote on 10/31/18 at 17:45:25:
you will have a larger gap between the final drive case and rim


I'm pretty darn close so it's safe to say there was no long spacer living inside.( shudda cleaned up the rear drive while I was at it Undecided)
  

HUB_SPACER.jpg ( 148 KB | 1 Download )
HUB_SPACER.jpg

Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA

Present:
1984 BMW R65LS "Herr Head"
past:
1979  R65   
1980  R65          
1982 R80RT 
1974 R90/6     
1972  R75        
1964 R50
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