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Old 01-20-09, 11:04 AM   #1
BFTbiker
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Retrofitting Old Frame

I have an old Schwinn chromoly frame and a set of good used Mavic Openpro rims that I want to put together to make a super comfy ride. I was thinking about putting 9spd dura-ace barcons on it. I have a few things that are making me wary: First off, the frame was designed for 126mm 27" wheels and the set I have are 130mm 700c. I already cold set and aligned the frame to fit the new spacing, but now after putting them in, I've noticed the brake reach is a little short, making the brake shoes rub the tire slightly under actuation. Being the retro style center-pull calipers, is there any cost-effective replacement calipers that would reach (Dia compe 750?), or will a small rub be ok? Also, will I encounter problems with an old stock crank and front derailleur on a 9spd system? I hear the front DR is friction shifted on barcons, but didn't know if the cable pull length or setup is different from vintage to new road DRs. Any info is greatly appreciated
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Old 01-20-09, 12:30 PM   #2
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Consider Sheldon Brown's solution: http://www.sheldonbrown.com/home-drop.html

Your front derailer will work fine with friction barcons.
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Old 01-20-09, 12:46 PM   #3
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It's really not good for the brake pad to rub on the tire. Even if it's only a lit bit now, as the pad wears down on the rim it'll start wearing more into the tire.

Tektro 421's might be long enough for you. They're sidepull dual pivot though, which may be a pain on your frame (though I think not).
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Old 01-20-09, 04:56 PM   #4
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Consider Sheldon Brown's solution: http://www.sheldonbrown.com/home-drop.html

Your front derailer will work fine with friction barcons.
I did essentially the same thing with a little piece of electrical conduct for a quick 'n' dirty job.
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Old 01-20-09, 05:19 PM   #5
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It's really not good for the brake pad to rub on the tire. Even if it's only a lit bit now, as the pad wears down on the rim it'll start wearing more into the tire.
That's not a strong enough statement. If your brake pads touch your tire even a little it'll blow out your tire sidewall faster than you'd ever imagine.
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Old 01-21-09, 11:48 AM   #6
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FD will be fine, but you need new calipers. I've had luck doing this with several different sets of centerpulls; I'm surprised yours aren't giving you enough reach. Don't know of a good replacement.
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Old 01-21-09, 12:05 PM   #7
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I wouldn't mess around with a drop bolt since there are so many brakes out there that have plenty of reach. Just measure the reach you need (center of mounting bolt to center of brake surface on the rim) and get brakes that will adjust accordingly. Whatever you do, get the brake pads off the tires!
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Old 01-26-09, 08:10 AM   #8
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Thanks everyone. I'm going to use the money I would have spent on a FD for new calipers now.
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Old 01-26-09, 10:29 AM   #9
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That's not a strong enough statement. If your brake pads touch your tire even a little it'll blow out your tire sidewall faster than you'd ever imagine.
Yup, happened to me too, beleive it.
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Old 01-26-09, 10:38 AM   #10
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If you're building up new wheels anyway (you say you had Open Pro rims, not sure if you mean they're on wheels or not) then I'd highly recommend just getting some 27" aluminum rims (probably 36-hole; 32-hole rims are rare in 27" size) and building them up that way.
I've built two rear wheels with 27" rims and cassette hubs for use on old Schwinn frames.
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Old 01-26-09, 01:25 PM   #11
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http://aebike.com/page.cfm?PageID=30...ils&sku=WE8690 cheap.
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Old 01-26-09, 02:14 PM   #12
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+1 Nothing wrong with sticking with 27 inch rims.
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Old 01-26-09, 02:28 PM   #13
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Also, will I encounter problems with an old stock crank and front derailleur on a 9spd system?
The new chain will be too narrow and may fall in between the rings...
Planned obsolescence is awesome, eh?
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Old 02-02-09, 07:49 AM   #14
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The wheelset I have are open pros with dura ace hubs, and I already set the frame to fit them, so they are staying. but now I have more questions: Can I use a sidepull caliper on a bike designed for centerpulls? And will modern cranks fit on my old BB?
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Old 02-02-09, 08:21 AM   #15
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You should be able to use sidepull calipers but make sure you get the right mount. Check the brake bridge and fork crown to see if they take recessed allen nuts or if you need a longer brake bolt with standard hex nuts. That could limit your options. The width and threading of your BB shell would determine what BB and cranks you could install. 68mm and English threading is the most common.

Here's an example of a budget sidepull for nutted mount:
http://www.modernbike.com/itemgroup.asp?IGPK=2126175524

Last edited by mmmdonuts; 02-02-09 at 08:26 AM.
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Old 02-02-09, 09:44 AM   #16
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The wheelset I have are open pros with dura ace hubs, and I already set the frame to fit them, so they are staying. but now I have more questions: Can I use a sidepull caliper on a bike designed for centerpulls? And will modern cranks fit on my old BB?
The brake mounts on the frame and fork are for nutted brakes since you say the bike had centerpulls. You'll need to drill for the recessed nuts if you go with modern calipers. Yes, modern cranks will work. The threading is English, the shell is 68mm wide, just make sure to get the correct spindle length for whatever crankset you use.
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