Swapping wheels - rotor alignment so I don't have to adjust the caliper each time
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  1. #1
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    Swapping wheels - rotor alignment so I don't have to adjust the caliper each time

    I purchased a second set of disc wheels for my disc braked bike. When I swap wheels, the rotors don't line up. The wheels (including hubs) are from two different manufacturers.

    I had two sets of wheels for a mountain bike previously, the LBS had some really thin shims that could be used under the rotor to get one set to line up with the other set.

    My new road bike has the Shimano Centerlock hubs. Both wheelsets are Centerlock, but the rotors don't line up quite the same and the thin shims for 6 bolt rotors wouldn't work.

    I'm reluctant to bend the rotors all the way around because that would undoubtedly result in wavy rotors. I'd hate to ruin one or more $70 rotors.

    Is there a way to get the rotors adjusted so that I can swap wheels without having to align the caliper each time?

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    You have rocketed to the top of my Favorite People List. Thanks!

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    Interesting... this challenges my, "One bike, multiple wheel sets" theory. I wonder how likely rotors are to line-up if you have multiple wheel sets that use the same hubs and discs. Hmm...

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    Quote Originally Posted by PoorInRichfield View Post
    Interesting... this challenges my, "One bike, multiple wheel sets" theory. I wonder how likely rotors are to line-up if you have multiple wheel sets that use the same hubs and discs. Hmm...
    I'm guessing if hubs and discs are the same, you shouldn't have a problem.

    I built two new wheelsets for my disc gravel bike in the last year. I used the same discs as on the OE wheelset, but I used Shimano R770 hubs vs. Formula hubs on the OE's. I have a very slight rub on my rear brake with the new wheels, but not the front.
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  6. #6
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    There's no need to have rotor rub, even with center locks. The shims linked above resolve to within .25mm repeatability among different wheels. Worst case (mechanical brakes and quick release axles) you should still be able to eliminate all rotor rub using shims. One bike and multiple sets of wheels is very much a valid thing.

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    Quote Originally Posted by November Dave View Post
    There's no need to have rotor rub, even with center locks. The shims linked above resolve to within .25mm repeatability among different wheels. Worst case (mechanical brakes and quick release axles) you should still be able to eliminate all rotor rub using shims. One bike and multiple sets of wheels is very much a valid thing.
    They are not easy to find. Got mine from Boyd cycling.

    https://boydcycling.com/collections/...or-shim-4-pack

    Got em in 48hrs.



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  8. #8
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    They're not that hard to find -https://novemberbicycles.com/collect...shim-pack-of-4 - signed, the guy who invented them.

  9. #9
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    Quote Originally Posted by PoorInRichfield View Post
    Interesting... this challenges my, "One bike, multiple wheel sets" theory. I wonder how likely rotors are to line-up if you have multiple wheel sets that use the same hubs and discs. Hmm...
    Interesting, we would to test the equations of the N+1 where N is the number of bike.

    New equation should be :
    N+1=2Wx2
    N= 2Wx2-1N
    N=2Wx2-1N

    N+1 Or (2Wx2-1N)+1 would apply


  10. #10
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    Actually I just did the change and was planning to add spacer but ended up not needing it.

    Before doing so follow this procedure:

    1.Use the wheel with the disk point the most outward.
    2.Space the pad as far as possible on both side.
    3. Unscrew the break from the frame, just loose it.
    4. Hold the brake
    5. Screw back the brake to the frame
    6. Tighten/adjusting the pad back to the disk.
    7. Try the other wheel.

  11. #11
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    Quote Originally Posted by Patb095 View Post
    Interesting, we would to test the equations of the N+1 where N is the number of bike.

    New equation should be :
    N+1=2Wx2
    N= 2Wx2-1N
    N=2Wx2-1N

    N+1 Or (2Wx2-1N)+1 would apply

    Clever.
    "COMPLACENCY IS LETHAL - VOTE in November." - System Shock.

    "With
    bicycles in particular, you need to separate between what's merely true and what's important."
    -- DCGriz, RBR.





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