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  1. #1
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    First post and bike build

    I like to tinker and now love to bike. I would like to take all of the Dura Ace components off of a 650 carbon bike and put them on a 700 steel (actually, 27" vintage). I plan to sell the carbon frame and fork and use the money to buy a nice wheel set and carbon fork for the build. But I have absolutely no idea what I'm doing. A couple questions -
    1. I guess I need to let my bike shop remove the old cranks? I got as far as I could.
    2. Will components on a 650 work on a 700? I assume I'll need a longer chain?
    3. Anything else I should be aware of?
    I can't spend over a $1000 on a nice bike yet. I've commuted on a hybrid 18 miles a day for about 300 miles this fall and had a blast. Now I'm looking to build a ligher, faster bike that actually fits me. Thanks for the help.

  2. #2
    Unique Vintage Steel cuda2k's Avatar
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    First off, welcome to bikeforums! Secondly, as someone how has tinkered with 27" frames and newer parts, let's see if I can get you through some of the pitfalls which are awaiting you:

    #1 biggest problem you are going to face is the brakes. Older frames had a longer drop between the brake bolt and the rim to allow for larger tires, fenders and all that jazz. Even if you keep 27" wheels you are going to need at least 'standard' length brakes which are typically approx 47-59mm length. I would nearly put money on the fact that you have a set of short reach dura-ace brakes who's max reach is ~49mm. If you get a Carbon fork, it will fix this problem for the front brake, but you are still left with the rear to deal with. There are drop bolts (if you can find them at usually around $40+ each) that will help.

    #2: your carbon fork idea. Good idea, just know that you will need one with a 1" tube, which will most likely be a threadless design. Which will need a threadless headset. There will likely be a minor change in the bikes geometry with the new fork that you need to be aware of. I won't pretend to know much about that and hopefully someone else can give some possible effects of this change.

    #3 as far as the crank, I haven't worked on these new DA cranks and bottom backets, but some searching on google and/or these forums will likely yield some information on what is needed.

    #4 last thing that may be an issue is if your vintage steel frame has downtube shifter bosses for the brifter cable adjusters. I know that the Shimano Golden Arrow shifters (which are about $22 at loosescrews.com) have a clamp on boss design that may get you around this. I haven't tired so can't say for sure, but it's an idea. If you get the golden arrow shifters and end up not using the levers - let me know, I'm looking for a spare set without the clamp band.

    -- slaps forehead, something else you need to be aware of is the difference in rear drop out spacing. New 9/10 speed stuff is going to want a 130mm spread and your frame is likely 120 or 126mm. Do a search for cold setting a frame on the boards. Lots of info on how to fix this since you have a steel frame. Sheldonbrown.com is another wonderful resource on anything cycling related!
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  3. #3
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    I think cuda2k hit most of the high points nicely... a couple of additions...

    Quote Originally Posted by twindadgolf
    1. I guess I need to let my bike shop remove the old cranks? I got as far as I could.
    Aside from a couple standard socket wrenches, you'll need a crank puller. Fortunately, this is a pretty affordable tool, and as cuda2k says, do some searches (or look on http://www.parktool.com) and you will be able to figure out which one you need. Bottom bracket removal may be more of a challenge, but again if you search on these forums there are tons of hints about removing BBs. You can certainly have your LBS do it as well.


    Quote Originally Posted by twindadgolf
    2. Will components on a 650 work on a 700? I assume I'll need a longer chain?
    Assuming the bottom bracket fits (it might and might not), and you don't have any clearance issues between the crankset and chainstays, then I agree with cuda2k that brakes will be the biggest thing. In addition to being short-reach, the brakes on the 650c bike are almost certainly modern allen-mounted brakes, while the 27" frame almost certainly uses older-fashioned nutted mounts. (See http://sheldonbrown.com/gloss_ra-e.html#recessed for details.) Harris Cyclery sells a set of long reach brakes that are available with the old-fashioned mounting http://harriscyclery.net/site/itemdetails.cfm?ID=1006 -- these might be really helpful, for the rear brake definitely, and also in front until you replace the fork.

    However, as an additional complication, when switching from 27" to 700c, you can enter a nether-world where even long-reach brakes (up to 57mm) don't quite reach. I have a friend who did a 27" -> 700c conversion and needed to find brakes that reached ~63mm. eBay came to the rescue there. However a drop-bolt solution would also work, or these nifty extra-reach calipers from Kogswell: http://kogswell.com/brakeDESC.html.

  4. #4
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    Hm, and I also wonder about the clamp diameter of the front derailleur on a carbon frame...? I don't have experience with carbon but I imagine it would be fatter than standard old steel tubing?

  5. #5
    Unique Vintage Steel cuda2k's Avatar
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    Quote Originally Posted by schang
    Hm, and I also wonder about the clamp diameter of the front derailleur on a carbon frame...? I don't have experience with carbon but I imagine it would be fatter than standard old steel tubing?
    Good catch, it's probably either a braze on or the larger size. If it's a braze on you can buy the clamps to attach it to in the correct size. Otherwise, sell your large clamp on ebay and buy the smaller clamp size. Exact sizes escape me at the moment.
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  6. #6
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    Thanks, guys. I'll let the bike shop mess with the bottom bracket. Maybe he'll let me watch and discuss the rest of the project. I have three good shops near me. I'll call this morning and see who has experience with this kind vintage bike and a reasonable price.

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