Dura-Ace SS specific mtb Disc Wheel....- Mtbr.com
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  1. #1
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    Dura-Ace SS specific mtb Disc Wheel....

    This project was a long time in the making, but it's up and running now. A year ago, I got a circa '80s Dura-Ace freewheel hub (28-hole, 126mm axle) from a friend that was cleaning house, came from an old sew-up rimmed wheel who's history was forgotten. Cool, I thought, it'll make a good SS wheel for the road bike - threads on the freewheel hubs are the same as BMX freewheels.

    I also had this 1st Principles disc adapter that converts a standard shimano hub into a disc hub. The problem was it was drilled for a 32 hole hub...

    OK, so I drilled some extra holes in the hub, bolted the adapter to it, came up with a symmetric pattern to lace 14 spokes to 16 holes (by skipping 2 opposing holes and using 5 different spoke lengths), respaced the axle to 135mm, and I have a Dura-Ace SS wheel that is ISO disc compatible with an eccentric axle adjustment of 3~4mm. (<a href="https://forums.mtbr.com/showthread.php?t=2005&highlight=eccentric">as done on a previous wheel here</a>). I also tapped the QR axle to take M6 bolts.
    <img src="https://gallery.mtbr.com/data/mtbr/516/2342591stP_durace_SS_disc_bolt-spoke.jpg">
    Un-used spoke holes at 2-O'clock and 7-O'clock on the black adapter flange.

    <img src="https://gallery.mtbr.com/data/mtbr/516/2342591stP_durace_SS_disc_disc-lacing.jpg">
    Symmetry lacing

    <img src="https://gallery.mtbr.com/data/mtbr/516/2342591stP_durace_SS_disc_on-bike.jpg">
    Going on a few rides now, looks like it'll hold up just fine.

    Cheers,

    Tom

  2. #2
    Nouveau Retrogrouch SuperModerator
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    Nice! The red detailing on the rotor is cool, too.
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  3. #3
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    Quote Originally Posted by itsdoable
    I also had this 1st Principles disc adapter that converts a standard shimano hub into a disc hub. The problem was it was drilled for a 32 hole hub...
    Okay - I admit I thought it was a silly product when they were introduced.... they cost more than a new cheapy disc hub.... but that's a spiffy (semi)vintage conversion!


  4. #4
    ...is still one gear
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    Good job! Dura Ace Iso Disc....

    Nice!....where could I get hold of one of those 1st Principles disc adapters?

  5. #5
    Harrumph
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    That's what I like to see. 28 spoke on a Disk/SS may not be ideal but thats pretty damn cool.
    Slowly slipping to retrogrouchyness

  6. #6
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    1st Principle Adapter: I agree with aosty, I thought they were not very cost effective (it cost more than all the other parts combined!), but I thought they were cool, so I picked one up to convert an old DT-Hugi hub. Not sure how I ended up with an extra. An lbs still has a few. (http://www.firstprincipleseng.com/)

    28 spokes - I think it'll hold up fine, I've been running a Rolf wheelset as an SS (24 fr / 28 rr) with no problems. The rim has a pretty deep x-section (vintage Velocity) and there is zero dish.

    Cheers,

    Tom

  7. #7
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    That has to be the oddest SS rear wheel going.

    Good work

  8. #8
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    Quote Originally Posted by itsdoable
    came up with a symmetric pattern to lace 14 spokes to 16 holes (by skipping 2 opposing holes and using 5 different spoke lengths)
    Tom, how did you come up with the spoke lengths? That is, what did you put into the spoke calculator to find out the length?

    I assume that there's 3 spoke lengths each side, and you doubled up a spoke length between the two sides (thought it would have been the radial initially, but it isn't likely to be with that disc/flage adaptor)?
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  9. #9
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    Quote Originally Posted by Bike_13
    Tom, how did you come up with the spoke lengths? That is, what did you put into the spoke calculator to find out the length?

    I assume that there's 3 spoke lengths each side, and you doubled up a spoke length between the two sides (thought it would have been the radial initially, but it isn't likely to be with that disc/flage adaptor)?
    The DA side is standard 3-cross lacing.

    On the adapter side, the radial pair is easy. I started a spreadsheet to calculate the other spoke lengths, but couldn't be bothered. I then calculated 2 & 3 cross with 32 & 28 lacing, and as you lace away from the symmetric point, you know one spoke will get longer, the other shorter. In the end, I laced up the DA flange (14 spoke side) normally, installed the 2 radial spokes on the adapter flange to get the wheel dished roughly, and then I just measured the lengths I needed right off the wheel. Ended up with 5 different lengths (radial, 1st 3-cross pair across the radial spoke, the the next 2-cross pair had 2 different length spokes, plus the DA side)

    Just to make things more interesting, the black spokes (DA side) are a mix of strait 15 gauge and DB 14/16 gauge spokes - which ofcourse means different nipples... it was what I had lying around.

    Cheers,

    Tom

  10. #10
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    Quote Originally Posted by itsdoable
    The DA side is standard 3-cross lacing.

    On the adapter side, the radial pair is easy. I started a spreadsheet to calculate the other spoke lengths, but couldn't be bothered. I then calculated 2 & 3 cross with 32 & 28 lacing, and as you lace away from the symmetric point, you know one spoke will get longer, the other shorter. In the end, I laced up the DA flange (14 spoke side) normally, installed the 2 radial spokes on the adapter flange to get the wheel dished roughly, and then I just measured the lengths I needed right off the wheel. Ended up with 5 different lengths (radial, 1st 3-cross pair across the radial spoke, the the next 2-cross pair had 2 different length spokes, plus the DA side)

    Just to make things more interesting, the black spokes (DA side) are a mix of strait 15 gauge and DB 14/16 gauge spokes - which ofcourse means different nipples... it was what I had lying around.

    Cheers,

    Tom
    Wow, you've got more time than I.

    I applaud your initiative to use what's lying around. That's fun, and I reckon a great deal of my mechanical aptitude (if you can call it that) has come from making things work, that most people think couldn't. It just takes time and patience.

    Lacing 24h rims to 36h hubs I have done on many occasions. But your "creative" lacing would probably require more time and trips to the LBS (don't work in one anymore) than I can justify.

    Please, keep me up to date in how relaible the lacing pattern is - seeing it's offside, I don't think you'll have any issues.
    Riding a bike is not a fashion show

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  11. #11
    I'm feeling dirty, you?
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    Wow itsdoable, and you even did a Rolf wheel.

    I love your attention to detail... lacing patterns, spoke colours, spoke guages, etc...

  12. #12
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    That is just over the top cool. You ride some wild stuff!

    Awesome creativity and ingenuity.
    Only boring people get bored.

  13. #13
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    More bolt-on info?

    Quote Originally Posted by itsdoable
    I also tapped the QR axle to take M6 bolts.
    Tom, really cool project you have there - I'm especially curious about the DIY bolt-on. How has that been holding up? Do you have any more details on that part? I know M6 bolts are pretty widely available, but where did you get those washers? Thanks.

  14. #14
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    Quote Originally Posted by cloughja
    Tom, really cool project you have there - I'm especially curious about the DIY bolt-on. How has that been holding up? Do you have any more details on that part? I know M6 bolts are pretty widely available, but where did you get those washers? Thanks.
    The Shimano axles are pretty amenable to an M6 tap, I think the ID is slightly too large, so I tapped as far in as I could, and used a long M6 bolt. The washers came from a VanDessel fixie hub that I stripped (the threads for the cog), which happens to use an M6 bolt. But you can take an old QR skewer nut and drill it out for an M6 bolt. Or ask one of the track/bolt on hub makers for spare washers. I would have just used a good steel QR skewer, but I wanted to try tapping the axle - which is an and idea I heard from someone on this board....

    As for longevity, I can't say. But it's been on 4 rides (5 tomarrow), I've fiddled with it a few times on the first two rides (getting the fugly home made disc mount adapter aligned) - it has not slipped during any ride, and the teeth on the axle & washers has bitten into the dropout (leaving marks) each time I adjusted the wheel position. Shimano axles have pretty agressive serations.

    Cheers,

    Tom

  15. #15
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    Thanks for the info. I have some old shimano hubs in the parts bin so I'll probably give that a try.

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