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  1. #1
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    rim width effect on ride quality

    I couldn't find any posts on this in particular.

    My Tricross Sport came with Alex rims with a 17mm internal width and I've been wondering if the wider rim doesn't allow my 700x32 Specialized Borough Sport tires' sidewalls to bulge as much as a narrower rim would, thereby reducing the "spring" effect of the tire's sidewalls.

    Would going to a 15mm internal width rim give me noticeably better ride quality?

    I would be going from a 622x17 32-spoke 3-cross wheel to a 622x15 32-spoke 3-cross wheel.

    I'm also thinking about more permanently using 700x28 Conti Gatorskins on pavement.

    Would the 17mm rims give a harsher ride then 15mm rims when used with 700x28 Gatorskins?


    Here's a cut & paste spec of my wheelset & tires:
    RIMS
    Alex ACE-19 double wall rim, CNC sidewalls, spoke eyelets, 32h
    FRONT HUB
    Specialized forged alloy, 32h, sealed bearings, QR
    REAR HUB
    Specialized forged alloy, 32h, sealed ball bearings, cassette, QR
    SPOKES
    Stainless 14g
    FRONT TIRE
    Specialized Borough Pro CX, 700x32c, aramid bead, 120TPI
    REAR TIRE
    Specialized Borough Sport CX, 700x32c, wire bead, 60TPI


    I'm running the 120TPI tire on the front because I got 2-3 flats with it when I ran it on the rear. So far only 1 flat with it on the front. This tire's puncture resistance is lousy.
    FOR SALE:
    NEW Ritchey Pro 27.2 x 350 x 25mm-offset seatpost
    NEW Dura Ace 7703 9-speed triple 28.6 front derailleur
    USED Ritchey Pro 30deg 110 x 31.8 stem
    USED Specialized Comp 20-28deg 110 x 31.8 adjustable stem

  2. #2
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    Quote Originally Posted by thirdin77 View Post
    Would the 17mm rims give a harsher ride then 15mm rims when used with 700x28 Gatorskins?
    No. What gives "springiness" to a tire is the volume and pressure of air, not the shape of the sidewall. You are thinking of the sidewall as analogous to a steel spring but it doesn't work that way.

    http://sheldonbrown.com/tire-sizing.html#width

  3. #3
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    Wider rim will flatten out the tire. It will have more influence on how you corner. However, 32cs could definitely be mounted on a slightly larger rim.

  4. #4
    big ring MIN's Avatar
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    I've run the same 32c cross tire on both road (15mm inside width) and wider rims (17mm inside). I would say the the wider rim allows for more confident corning and causes the tire profile to be more round as opposed to oval.

    You should be fine running 28 or 32c tires on either rim though.

  5. #5
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    Quote Originally Posted by MIN View Post
    I've run the same 32c cross tire on both road (15mm inside width) and wider rims (17mm inside).
    This is just the experience I was looking for. Did you notice any difference in ride quality?

    Quote Originally Posted by MIN View Post
    I would say the the wider rim.. causes the tire profile to be more round as opposed to oval.
    I was wondering if the rounder profile allows the tire to be more shock-absorbent.
    FOR SALE:
    NEW Ritchey Pro 27.2 x 350 x 25mm-offset seatpost
    NEW Dura Ace 7703 9-speed triple 28.6 front derailleur
    USED Ritchey Pro 30deg 110 x 31.8 stem
    USED Specialized Comp 20-28deg 110 x 31.8 adjustable stem

  6. #6
    big ring MIN's Avatar
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    Not ride difference. More control due to less flexy sidewall movement on the wider rim though. The sidewall is straight up on the rim as oppose to moving away from the rim and back on top.

    On the 17mm rim, you shouldn't install 23c tires.

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