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  1. #1
    íManos arriba!
    Reputation: NoDunut4U's Avatar
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    New question here. Surly New Disc & Alex TD17 (spoke lenght seems "off")

    Since DFAS-CLEVELAND finally got thier rectal-cranial inversion fixed and I got _some_ of my long overdue pay, I just ordered up my Alex TD17 hoops to lace onto my Surly New Disc Hubs.

    (Yeehaa!)


    According to Surly the New Disc Hubs are:
    FRONT DISC (100mm spacing)
    flange diameter (L or R): 58mm
    C-T-F (left/disc side): 22.5mm
    C-T-F (right/drive side): 32mm

    REAR DISC (135mm spacing)
    flange diameter: 58mm
    C-T-F (left/disc side): 34mm
    C-T-F (right/drive side): 38.5mm

    ERD of the Alex TD17 is reported to be 542

    Now, I crunched the numbers two or three times on several different on-line spoke lenght calculators and they "just don't feel right" to me. The lenght just seems off for some reason. They all come in at between 260.55mm (shortest front non-drive) to 262.9mm (longests rear drive side).

    Giving that I usually knock a few mm off because I have a habit of bottoming out the threads in the nipples that would leave me at about 258mm spokes.... this just seems wrong to me. Perhaps it's from building too many "standard" wheels and here we are lacing a MTB hub into a road rim????


    Anybody 3X'ed a Surly New Disc Hub into an Alex TD19????
    Did you come up with similar numbers?

    Any propellor heads or more experinced wheel builders feel like double-checking my math for me?

  2. #2
    indigosky
    Guest

    Your ERD seems off...

    Quote Originally Posted by NoDunut4U
    Since DFAS-CLEVELAND finally got thier rectal-cranial inversion fixed and I got _some_ of my long overdue pay, I just ordered up my Alex TD17 hoops to lace onto my Surly New Disc Hubs.

    (Yeehaa!)


    According to Surly the New Disc Hubs are:
    FRONT DISC (100mm spacing)
    flange diameter (L or R): 58mm
    C-T-F (left/disc side): 22.5mm
    C-T-F (right/drive side): 32mm

    REAR DISC (135mm spacing)
    flange diameter: 58mm
    C-T-F (left/disc side): 34mm
    C-T-F (right/drive side): 38.5mm

    ERD of the Alex TD17 is reported to be 542

    Now, I crunched the numbers two or three times on several different on-line spoke lenght calculators and they "just don't feel right" to me. The lenght just seems off for some reason. They all come in at between 260.55mm (shortest front non-drive) to 262.9mm (longests rear drive side).

    Giving that I usually knock a few mm off because I have a habit of bottoming out the threads in the nipples that would leave me at about 258mm spokes.... this just seems wrong to me. Perhaps it's from building too many "standard" wheels and here we are lacing a MTB hub into a road rim????


    Anybody 3X'ed a Surly New Disc Hub into an Alex TD19????
    Did you come up with similar numbers?

    Any propellor heads or more experinced wheel builders feel like double-checking my math for me?
    Your ERD seems off. Did you get the ERD for the 26" TD-17 rim? I've got 604 for the 29" Alex TD-17 rims ERD. Anybody want to second that measurement?

  3. #3
    íManos arriba!
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    Quote Originally Posted by indigosky
    Your ERD seems off. Did you get the ERD for the 26" TD-17 rim? I've got 604 for the 29" Alex TD-17 rims ERD. Anybody want to second that measurement?
    Ahhhhh..... YES! that'd be it.....
    b!keusa lists the ERD of the 700c as 601
    THAT changes everything!

  4. #4
    indigosky
    Guest

    Had the LBS measure my TD-17's that I'm about to build...

    Quote Originally Posted by NoDunut4U
    Ahhhhh..... YES! that'd be it.....
    b!keusa lists the ERD of the 700c as 601
    THAT changes everything!
    and they came up with a ERD measurement of 609! they use the Wheelsmith rods to measure, so I tend to agree with their dimension.

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