Wheely confused

Discussion in 'Airheads' started by ME 109, Apr 1, 2013.

  1. ME 109

    ME 109 Long timer

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    So I'm about to replace my 12 sided rear '81 snowflake with a nice straight one.

    Trouble is, I think the straight wheel I have is a '77 (77/6 stamped on spline side)
    It has those raised humps in the spline cup area. It also has steel inserts.

    What can I do with this wheel in order to use it on a '81?
    Is it just a matter of grinding off those humps?
    The wheel is very straight and clean.

    Did a po toast his wheel bearings and have the inserts put in?

    So close, yet so far.:huh
    #1
  2. AntonLargiader

    AntonLargiader Long timer

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    Should be. That was BMW's published solution to using a newer finned FD on a pre-'81 bike. That's the same mismatch you're talking about.
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  3. ME 109

    ME 109 Long timer

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    Thanks Anton, I tried a basic fit up of the wheel and found that the fd did hit on those lumps, judging by the small amount of grease/grime left on the lump. The wheel would not turn at all.
    An angle grinder is one of my favourite surgical instruments so all should be good there.

    I was reading somewhere recently that the later snowflakes came with steel inserts?
    If this wheel has been sleeved due to a spun bearing, it has been done well.
    #3
  4. boxerboy81

    boxerboy81 Stay Horizontal

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    Jeff, the black wheels I have were earlier wheels, the rear had the "protrusions". Your choice of weapon should be your trusty angle grinder. That's what I did.You can see the remnants of some of them marked in red...
    [​IMG]
    #4
  5. ME 109

    ME 109 Long timer

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    Thanks Steve, a 4" angle grinder shall be the choice here.

    Imagine, a round back wheel. That will be something different.
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  6. Plaka

    Plaka Brevis illi vita est

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    On my '83 the center of the hub is steel all the way through. The outer bearing races sit on a steel shoulder that seems to be integral with the rest of the steel in the center. The bearing outer races come out their respective sides.

    Make sure the wheel is the post-recall type with the ribbed spokes at the center.
    #6
  7. Sniper X

    Sniper X De Oppresso Liber

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    Didn't the early snowflakes get recalled and replaced with the ones that had extra fins on the "spokes"?
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  8. ME 109

    ME 109 Long timer

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    That's for front snowflake wheels, excluding the 18" R65 front snowflake wheel.

    I'm going to operate on a rear wheel.

    I like the steel inserts. Much better idea.
    #8
  9. villageidiot

    villageidiot Long timer

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    Only the fronts
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  10. chasbmw

    chasbmw Long timer

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    It was only the 19" front wheels that got recalled.
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  11. ME 109

    ME 109 Long timer

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    Lucky I got in first. :D
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  12. ME 109

    ME 109 Long timer

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    Lugs removed and wheel on the bike.

    Not too impressed with the tyre tho'
    Michelin pilot active 4:00

    Wheel is very good for running true.
    Tyre on the other hand makes the wheel look buckled.
    Bike on centre stand in 3rd gear at about 1500, The tyre appears to have a buckle!:huh

    I let the tyre down to about 10 lbs and rolled the bike backwards and forwards for a couple of wheel revolutions.
    I pumped it back up to 75 psi then dropped it down toabout 37psi
    The 'buckle' in the tyre is still there, although the rim can be observed to run true, certainly not showing any sign of causing the tyre to move.

    I'd put a vid up but I've run out of time for a coupla days (goin' surf fishing. fuck the bike)

    Any thoughts? Can't say I've seen a tyre do this.
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  13. Plaka

    Plaka Brevis illi vita est

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    Buckle?? Pic?

    I just made something you gotta have for your poor abused RS...Time to start a build thread I guess.
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  14. ME 109

    ME 109 Long timer

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    I do a video when I get back in a coupla days.
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  15. ME 109

    ME 109 Long timer

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    That was a quick coupla days.

    Anyhowz, here is a you-tube link to my wobbly tyre.

    Not sure what y'all might suggest other than deflate and move tyre around and try again?

    http://www.youtube.com/watch?v=pFWJPcOt4Dw
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  16. Plaka

    Plaka Brevis illi vita est

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    Assuming the bearings and wheel are right, I'd deflate and try reseating the bead. Do check the witness line indicating the bead is right at the moment.

    You can't move it around, it has a balance dot.

    If that don't work I'd return it, defective.
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  17. ME 109

    ME 109 Long timer

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    The wheel is very true, as good as perfect for this application.

    No dot on this Michelin.
    The witness line is sitting as good as any tyre I've seen.
    Surely there would be sufficiently tight quality control............:huh
    #17
  18. Plaka

    Plaka Brevis illi vita est

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    QA missed putting the dot on. Don't tell me any tire made is perfectly balanced!

    How does it ride? If you can't return it and the vibration isn't too bad, may as well use it up. Otherwise I'd take it back.
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  19. ME 109

    ME 109 Long timer

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    Haven't ridden anywhere on it Plaka.

    I'll try rotating it, and if that doesn't cure it (can't see how) they can have it back.

    The whole purpose of this exercise is to replace my buckled adventure snowflake with a goodun.

    Huh, maybe this tyre would be a good fit with my old wheel!
    #19
  20. Plaka

    Plaka Brevis illi vita est

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    How did you damage the old snowflake?
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