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  1. #1
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    Picture this build...

    So I want to build a cross bike, and here are the parts that I have thus far. Most of this stuff is vintage.

    Wheels: one Campy Omega 32 laced to a Dura ace hub with a 7sp cluster, one Mavic MA40 laced to a matching dura ace hub, also 32 spoke

    Crankset: Dura ace double with a 52 tooth biopace chainring and a 32 tooth mystery chainring

    Derallieurs: Dura ace 7400 series front and rear, front is braze on

    Shifters: Right now I have dura ace downtube shifters, but I'd like to find some of those old 8sp STI's

    So I'm thinking about getting a crosscheck, but I'm still looking for other frames. Anyone think this could be a sick build with a funky mix of old/new stuff? Does anyone race cross with a 7speed rear end?

  2. #2
    Frozen to the Bike goofycc's Avatar
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    Running 52/32 up front is a huge drop. Try running something closer to 46/36, or standard compact (50/34)


    I do have to give props for the vintage stuff. I'd like to see this in action.
    Bikes I own: Kona Unit 29er, Giant TCX0, Orbea Pepper, Scattante XRL, Leader 735TR, Specialized Rockhopper

  3. #3
    shoot up or shut up. isotopesope's Avatar
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    there's no way a 32t chainring fits on a double d-a crank. i'd also opt for barcons over old sti's. if you can't find 7 speed ones, just run a newer one with pure friction!

    i think a crosscheck would look nice setup with that group though.

  4. #4
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    That was a typo...it's a 39t chainring. I'm really torn right now though, I've been looking at period correct road racing frames on ebay..... I'm starting to really want a Miyata. But a cross bike was my next planned build. Who made a vintage (late 80's early 90's) cross frame?

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    I ran a 7 on my sorely abused 80s road bike for the first year I did cross. Seven speed cassettes and freewheels are available cheap. You'll basically be running it as a single chainring. You might want to replace the 52 with a guard or a 46 or 48 ring. I put a set of cheap Sora brifters on a late 80s Shimano 105 set up and it still runs great.

  6. #6
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    Can I use any 8 speed brifter (dura ace, ultegra/600, sora) with the 7400 DA deralleurs? How many people run barcons on a cross bike? I'm thinking that might get hairy in a trailriding situation, which is why I already ruled out downtube shifters.

  7. #7
    M_S
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    I think the derailleurs would be fine with the 8 speed cassette. At least I knwo you can use 8 speed derailleurs with 9, and 9 with 10. It's the shifters that need to be correct to the # of gears. And chain, of course.

    As to the barcons, I think they're just dandy for trail riding. Very precise shifts and you can dump a lot of gears at once. It's good to set the bike up so you're comfy int he drops though. Like shallow bar or even a flared one like the on-one midge.

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    Ok, but I've got a 7 speed cluster on there at the moment. And whats up with my STI lever options? I can use a Campy 8speed lever???

  9. #9
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    Here's my understanding of the Dura Ace 8 spd STI situation:

    DA8 cog spacing is the same as any other shimano 8 spd cog spacing. If you have a freehub body that can take 8/9/10 spd shimano cassettes, any 8 spd cassette will work. To move a DA8 derailleur the correct amount, however, you must have DA8 shifters. Cable pull is different in the shifting mechanisms of other 8 spd STIs. Concordantly, the DA8 derailleur has a different cable pull ratio than other shimano derailleurs.

    So yes, you need DA8 STI's, barends, or DT shifters if you have a DA8 derailleur and want to run 8 spd.

  10. #10
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    Quote Originally Posted by xxsoultonesxx View Post
    Ok, but I've got a 7 speed cluster on there at the moment. And whats up with my STI lever options? I can use a Campy 8speed lever???
    You can use a campy 8 spd lever, if you use a shiftmate, but per the above post, the type you want works with non-DA8 spd Shimano rear derailleurs.

    I've used Chorus 8 ergos to shift on shimano 8 spd cogs with a shiftmate and a 105 rear derailleur. Butter.

  11. #11
    Packfodding 3 caloso's Avatar
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    Quote Originally Posted by xxsoultonesxx View Post
    That was a typo...it's a 39t chainring. I'm really torn right now though, I've been looking at period correct road racing frames on ebay..... I'm starting to really want a Miyata. But a cross bike was my next planned build. Who made a vintage (late 80's early 90's) cross frame?
    I think that all the Euro bike makers did. Here's a Gazelle Champion Mondial cx bike.



    Do some searching on Ebay. You might have to go to the European sites, though.
    Cyclists of the world, unite! You have nothing to lube but your chains!

  12. #12
    Team Beer Cynikal's Avatar
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    That's rad. A vintage CX bike is a long term goal for me. Caloso, when are we going to do that vintage ride?
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

  13. #13
    lurking. . . lurking. . .
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    I have done something similar with old road components. I just bought a used cross frame and hung mostly older stuff on it. I had 7 speed downtube shifters and switched them to bar end shifters using this product from Rivendell and have been very happy.
    http://www.rivbike.com/products/list...product=17-068
    only $25 for the pods and they shifting is great. I don't do any racing on it, but use it more as a commuter/touring/dirt road bike. It is my favorite bike.

  14. #14
    Packfodding 3 caloso's Avatar
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    Quote Originally Posted by Cynikal View Post
    That's rad. A vintage CX bike is a long term goal for me. Caloso, when are we going to do that vintage ride?
    Hah! Yep. We're definitely going to have to do it.
    Cyclists of the world, unite! You have nothing to lube but your chains!

  15. #15
    Padovano Mike552's Avatar
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    Quote Originally Posted by xxsoultonesxx View Post
    Ok, but I've got a 7 speed cluster on there at the moment. And whats up with my STI lever options? I can use a Campy 8speed lever???
    You can use any Shimano 9 speed brifter along with your current setup. The cable pull ratio of the 9 spd brifter is the same as DA8 shifters.
    *1987 Panasonic DX-5000/STI-9 *1983 Univega Gran Premio/STI-9 *1991 Bridgestone MB-2/Suntour XC Pro

  16. #16
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    Apparently, Sheldon Brown's site said that 8speed DA rear derailleurs have a unique cable pull ratio. And for the rear derailleur I should only be using DA levers. Which sucks, because they are expensive.

  17. #17
    Padovano Mike552's Avatar
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    Quote Originally Posted by xxsoultonesxx View Post
    Apparently, Sheldon Brown's site said that 8speed DA rear derailleurs have a unique cable pull ratio. And for the rear derailleur I should only be using DA levers. Which sucks, because they are expensive.
    read my previous post. sheldon agrees with me if you look hard enough...
    *1987 Panasonic DX-5000/STI-9 *1983 Univega Gran Premio/STI-9 *1991 Bridgestone MB-2/Suntour XC Pro

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