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Moving parts from old frame to new one - problems?

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Moving parts from old frame to new one - problems?

Old 08-11-14, 05:29 AM
  #1  
sced
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Moving parts from old frame to new one - problems?

I bought this frame to move parts to from a bike with Shimano 105 5600 triple for my new daughter in law.

GT Tachyon 4.0 Flatbar Road Frame - 2011 - Road Frames

It turns out that the swap is going to be more involved that I had expected., so I have some questions.

1. The new frame has posts for cantilever brakes at the rear. From the picture at a glance I had assumed that the rear would take a standard road caliper. What parts do I need to get for the cantilever brakes including some kind of cable guide that will work with the 105 front shifter's brake lever?

2. The OD of the seat tube is about 2mm bigger that that on the old frame, so the current 105 clamp-on front derailleur looks to not fit. Also, the new frame has an indentation on the drive side that looks like where a front derailleur is supposed to be attached. What to do here that will work with the 105 front shifter?

3. According to this spec sheet it uses a 31.6 seatpost. What size clamp will I need?

http://road-bikes.findthebest.com/l/...GT-Tachyon-3-0

4. Any other problems that yall foresee?

Many Thanks, Ed

Last edited by sced; 08-11-14 at 05:46 AM.
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Old 08-11-14, 12:00 PM
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Old 08-11-14, 12:08 PM
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Not cantilevers, but v-brakes, aka linear pull. You will also need something like a travel agent to adapt the pull ratio if using drop bar integrated brake/shift levers.

Second, it is unlikely your headset will move over with no issue.

Third, your rear wheel is likely a 130mm OLD and that GT frame is probably a 135MM OLD.

As mentioned, you'll need a new front derailleur of the appropriate clamp size. No shortcut here. Measure the seat tube with a caliper, that's the size clamp you need to buy.

Hope that helps!
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Old 08-11-14, 03:02 PM
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Cantilever and linear pull brakes fit on the same posts in the same location. Cantilever and caliper brakes have the same amount of cable pull, V-brakes need more cable pull.

Get some Tektro CR720 brakes - compatible cable pull with drop bar levers. You need a rear cable hanger. Take a look at these:
http://www.amazon.com/Brake-Hole-Mou...r+brake+hanger
Amazon.com : Tektro Rear Bicycle Brake Cable Hanger (aluminum - 8mm) : Bike Shift Cables And Housing : Sports & Outdoors
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Old 08-11-14, 03:28 PM
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I don't know of any way to mount 105 shifters on a flatbar. I think it would be easier use the components that came with the bike, or find a road frame if you want to use the 105 components.
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Old 08-11-14, 03:32 PM
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to resolve the front derailleur issue, i would omit it altogether, the shifter and extra chainring and cabling too.


and i assume the fork issue has been addressed? i didn't see one with the frame.

Last edited by hueyhoolihan; 08-11-14 at 03:35 PM.
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Old 08-11-14, 08:06 PM
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Thanks for all the info. Sounds like I really messed up on the frame I bought. I had assumed that I could just swap the parts over from this one.

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Old 08-11-14, 09:01 PM
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from the price of the frame in the link, i'm not sure you've suffered the type of financial setback that one needs to really learn a lesson well. losing 10 or 20 thousand on a bad stock tip is what's called for.
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Old 08-12-14, 07:51 AM
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You bought a flat bar bike to transfer drop bar parts. Very little in common, almost like buying a Ford to get parts for your Chevy.
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Old 08-12-14, 08:01 AM
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I've been poking around and see that I'm not in that bad a shape, though the $50 (but nice) frame is going to cost more than I had originally thought. The rear spacing is 130mm, so I'm good there, and there are incredibly cheap parts on Ebay. It'll be a very light duty ride.

Questions

1. The specs online say that the complete bike used a "FSA Integrated sealed bearing" headset. I see "semi-integrated" for sale - what's the difference?

2. I can get a 31.6 to 27.2 seatpost shim for $3 shipped. Do the shims work ok?

3. Will any recent bottom/dual Shimano triple FD, like for MTB's, work with the 105-5600 front triple shifter (same pull)?

Thanks!

Last edited by sced; 08-12-14 at 09:05 AM.
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Old 08-12-14, 10:48 AM
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1. don't know.
2. shims work fine, and less risk of getting stuck seat post.
3. different pull; get a road FD. The A073/A070 will work fine with the brifters.
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Old 08-12-14, 08:13 PM
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Originally Posted by nfmisso View Post
1. don't know.
2. shims work fine, and less risk of getting stuck seat post.
3. different pull; get a road FD. The A073/A070 will work fine with the brifters.

Thanks for all the great info. I'm on my way now.
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