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Thread: Is the dual disc front brake upgrade a big improvement?

  1. #21
    Senior Member BurlinsonK's Avatar
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    Back to the original post from 2014. I'm putting a GL500 dual disc on my CX500 this week. Have all the parts from master cylinder to GL500 wheel. What I want to know is, can I use my CX front wheel or a 78 com star by just swaping discs? Seems I read some where that the axles where different when it came to fitting the speedometer on. Thanks Ken

  2. #22
    Senior Member Manzanita's Avatar
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    Quick update; finally got around to playing with my cb650 forks this weekend, and I think I see an easy way to update my cx500 custom to the dual disc setup... since the cb650 lower fork body is the exact same size as the cx500 (yay!), and has the mounts for the additional right caliper in a dual caliper setup, my idea is to simply swap in the right lower into my current cx500 setup (just use the left cx500 fork assembly as-is, and use the right upper fork tube from the cx500 with the cb650 lower).

    I do see one issue: the fender mount bolts are a different height, but since they are higher on the cb650 part, I can drill higher holes into the cx500 fender tabs where they attach to the fork.

    The one issue I'm not yet sure of is the wheel/rotor/caliper alignment. I am fitting the cb650 dual-disc wheel onto the cx500, so will the alignment of the disc and the left-side cx500 caliper be okay? Stay tuned...
    Last edited by Manzanita; 05-09-2017 at 09:10 AM.
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  3. #23
    OCR
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    Probably better to swap the entire forkset over, then everything will line up.
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  5. #24
    Senior Member purplecx500's Avatar
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  6. #25
    Senior Member Manzanita's Avatar
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    Quote Originally Posted by OCR View Post
    Probably better to swap the entire forkset over, then everything will line up.
    Well at this point I don't know if it will line up. If it does, then I found a quicker way around the mountain... if it doesn't, then yes, I simply have to do what I would have had to do anyways... in fact I bought the fork tubes from a cb650 but not the triple tree, so if there is an alignment problem with the wheel I may have to also and install the cb650 triple tree.
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  7. #26
    Super Moderator Sidecar Bob's Avatar
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    Are the CB650 stanchions the same diameter as the CX500's? I know that the CX650 stanchions are a couple of mm larger....

    If the CBs are larger you would have to use the CB triple clamps so the next question would be whether the steering heads are the same length.
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  8. #27
    Senior Member Manzanita's Avatar
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    Quote Originally Posted by Sidecar Bob View Post
    Are the CB650 stanchions the same diameter as the CX500's? I know that the CX650 stanchions are a couple of mm larger....

    If the CBs are larger you would have to use the CB triple clamps so the next question would be whether the steering heads are the same length.
    Yes, same diameter, so the cb650 stanchion upper fits perfectly into the current cx500 triple tree and the cb650 lower fits the cx500 stanchion exactly. The reason why they are not a direct swap is the cb650 stanchion upper is about 2 inches longer than the cx500.
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  9. #28
    Super Moderator Sidecar Bob's Avatar
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    Then all you have to do is put the CB forks in the CX clamps and mess around with the spacers.
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  10. #29
    Administrator ChopperCharles's Avatar
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    Yeah, tubes will slide right in and oem axle spacers will work. That said, consider the EBC rotors for the CX500. They're a nice upgrade. The hole pattern will help with fade on track day.

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  11. #30
    Senior Member Manzanita's Avatar
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    Quote Originally Posted by Sidecar Bob View Post
    Then all you have to do is put the CB forks in the CX clamps and mess around with the spacers.
    But the cb650 forks are 2" longer so although I could put my emulators and linear fork springs into the cb650 forks, to have the rake the same I'd have to clamp them with 2" of fork sitting above the triple tree. Aside from the cosmetic issue, not sure if that will interfere with anything....
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