Crack om Comstar rear rim
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Thread: Crack om Comstar rear rim

  1. #1
    Junior Member ErNor's Avatar
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    May 2018

    Crack om Comstar rear rim

    Hi, I just noticed that my golden Comstar aluminum rear rim seem to have small cracks near the hub in the base of three of five spokes. Is this normal? Do I need to replace or can it be fixed/welded?
    Attached Thumbnails Attached Thumbnails Crack om Comstar rear rim-b21cfd31-75cc-4415-8aa8-7d40d825b26a_1570977393347.jpg  

  2. #2
    Senior Member Rod Fryatt's Avatar
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    Jun 2015
    Lowestoft UK
    Personally I would never trust it again.

  3. #3
    Senior Member Paul F's Avatar
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    Aug 2016
    Amherst, MA
    are you 100% sure it's a crack or could it be an imperfection in the casting? try doing some light grinding and/or sanding to see how deep it goes, can you see either piece flexing?
    current project: 1986 CB450SC Nighthawk

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  5. #4
    Senior Member mike in idaho's Avatar
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    Jan 2012
    You could find a used replacement for probably less than having it repaired, most reputable shops won't touch it because of liability issues.
    Brent likes this.
    '65 YG1
    '65 CB160
    '66 CL160
    '67 CL77
    '68 TR6
    '69 T100R
    '69 T120R
    '72 Commando 750
    '78 XS650E
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    '81 440 LTD
    My company car is a Kenworth

  6. #5
    Senior Member Rscottp's Avatar
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    Jun 2018
    Martha's Vineyard Ma
    Replace it, it's a safety issue to me. Better safe than sorry(dead).
    1981 Honda CX500D
    1974 Honda CB450
    1986 Yamaha Radian 600

    Martha's Vineyard Ma

  7. #6
    Senior Member Alan F.'s Avatar
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    Aug 2009
    What model and year is your bike? The wheel will also be labeled with diameter and width.

    Someone local may have a wheel to sell you, remember that ebay now charges sales tax so the for sale and wanted sections of the forums are where we need to be buying and offering our spares.
    CB250 Nighthawk projects 92,93,92.
    81 CM400C Sold
    93 CB750 Nighthawk Sold
    73 CB750K3 Long term project stuck in the 'parts collecting stage.'
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  8. #7
    Super Moderator longdistancerider's Avatar
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    Oct 2011
    Vancouver Washington (text 408-239-9580)
    I'm not sure that's a crack, it may be a casting flaw. I would file that area down some and see if it's just a surface issue or it truly is a crack. US replacements will always be black, gold wheels were UK and Europe
    Paul F likes this.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
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  9. #8
    Junior Member ErNor's Avatar
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    May 2018

    Crack Comstar rear rim

    Thanks guys appreciate the response.
    Will pull and clean the wheel today and have a closer look.
    The wheel is a MT 2.15 x 18 of a CB400N not original to my CM400T.
    Attached Thumbnails Attached Thumbnails Crack om Comstar rear rim-fb5c0b11-4d68-4194-9750-5217362827c6_1571045924298.jpg   Crack om Comstar rear rim-e03b73c6-cdf6-491a-b68d-848b990f9fc5_1571046028871.jpg  

  10. #9
    Junior Member ErNor's Avatar
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    May 2018
    Sanded all the areas down, and the “cracks” disappear. It seems to be imperfections from the casting but I haven’t noticed them earlier. Will put a coat of black engine paint on the inner part of the wheel and keep my eyes open both for new cracks and a replacement wheel.
    Attached Thumbnails Attached Thumbnails Crack om Comstar rear rim-b7ac9030-58d1-4dae-9295-6e9da809eeb5_1571055460608.jpg   Crack om Comstar rear rim-ade39241-2d80-4dac-833e-712f45f12f1b_1571055476694.jpg  
    Paul F and longdistancerider like this.

  11. #10
    Senior Member drydreamer's Avatar
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    Aug 2015
    Any "creaking" noises when wheel grabbed and moved for wheel bearing play?

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