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  1. #1
    Senior Member
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    Apr 2009
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    Boulder County, CO
    My Bikes
    '89 66cm Cannondale 3.0, '92 22" Cannondale M2000, '92 JxL Cannondale R1000 Tandem, '86 Cannondale ST800 27" (68.5cm) Touring bike w/Superbe Pro components and Phil Wood hubs.
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    27" Rim Options (630 bsd/iso)

    Classic and Vintage bikes almost necessarily means bikes designed for 27" (630) rims. While you can make 700c rims work fine with long reach brakes, or on bikes with cantilever posts, the point is that there is absolutely nothing wrong with the 27" rim standard. Which is to say that there is nothing inherently better or improved about the 700c rim.

    A 27" rim is really a 630mm rim at the bead seat.
    A 700c rim is really just a 622mm rim at the bead seat.

    For large frames (mine are 68.5cm) you want the biggest rims you can get, even if they are just 4mm larger in radius (8mm in diameter) to keep from looking "off".

    Well...Velocity may have added more rims to their 27" offerings.

    Recap. Velocity offers the following rims in 27":

    Dyad in 48h
    (Also known as Aeroheat AT, Super stout touring/tandem duty rim, think Mavic Module 4 or Super Champion Model 58/59 w/o eyelets)

    Dyad.jpg

    Synergy in 36h
    (Good all purpose rim)

    SynergyFront.jpg

    Twin Hollow in 32h, 36h, and 48h
    (light duty single wall)

    TwinHollow.jpg

    While Velocity had the touring/tandem rim market for 27" covered with the Dyad, at least for 48 drill, it turns out that there really was not a good 27" 40h rim on the market.

    Well Velocity seems to be coming to the rescue with additions to their 27" rim line.

    They will apparently now be making the Aero in 27" in 32h, 36h, and 40h.

    Aero.jpg

    This doubles their coverage of "good" rims for 36h, adds a "good" rim to the 32h conversation, and completely owns the 40h 27" rim market.

    Velocity Aero Rim
    Last edited by mtnbke; 02-21-11 at 11:21 AM.

  2. #2
    www.theheadbadge.com cudak888's Avatar
    Join Date
    Sep 2005
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    Southern Florida
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    http://www.theheadbadge.com
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    I'm a fan of the Twin Hollow myself. Arguably the strongest single-wall rim I've ever seen. I'd expect it to outperform in strength in comparison to any other single wall rim on the market - and some dual-walls to boot.

    -Kurt

  3. #3
    my name is Jim BlueDevil63's Avatar
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    Aug 2010
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    Sun M13II is available in 27".

  4. #4
    Senior Member
    Join Date
    Apr 2009
    Location
    Boulder County, CO
    My Bikes
    '89 66cm Cannondale 3.0, '92 22" Cannondale M2000, '92 JxL Cannondale R1000 Tandem, '86 Cannondale ST800 27" (68.5cm) Touring bike w/Superbe Pro components and Phil Wood hubs.
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    Quote Originally Posted by BlueDevil63 View Post
    Sun M13II is available in 27".
    Available in 27" in 32h and 36h.

    Sun M13II Cross section:
    SunM13II.jpg

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