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Sekine Rebuild

Old 07-08-07, 11:57 AM
  #1  
Spc_Cdt
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Sekine Rebuild

After much frustration with relying on my local bike shop (LBS) to deal with the problems nagging me on my bike, and their increasing lack of cooperation in catering to my needs, I have decided to learn everything that I could about my machine so that I could take matters into my own hands and custom-tune my bike.

The first step to this endeavour started with buying a cycling maintenance manual, which I should've already had but would always borrow from the library instead. Since I didn't want to mess with my daily commuter as I learnt about bikes, I decided to go about this in two ways: by rebuilding a '70s road bike, and by building a bike frame from scratch.

For the rebuild, I found an old Sekine road bike in the dumpster; for the build, I will be brazing chromoly steel tubing with lugs. The rebuild will be on-going as I learn about welding and hone my CAD skills for the build, and the entire process will be recorded as a "photo-diary" of sorts in an effort to hone my photographic skills. Here we go!



Sekine Rebuild- Day 01
I am keen to discover more about this bike. After some research I found out that Sekine was a bike manufacturer in Canada during the cycling "boom". In the hopes that someone else can help me identify it, here is all the information I could pull from the bike before starting to tear it down:

Sekine Medialle (serial # 0244 CY)
Made in Canada (probably SHA or SHC)

Components
F/D: Thunderbird
R/D: Eagle 2
cranks: cottered, Takagi 310
brakes: Shimano Tourney
brake levers: Shimano Dee-50
hubs: Shimano 5358

Geometry
ST (c-t): 546mm
TT (c-c): 558
DT (c-c): 622
HT (w/headset): 127
CS (to drops): 457
SS (to drops): 482
crank arm: 165
handlebar width: 355-406

And before stripping the bike, Shad recommended a thorough soaking in WD-40. That way, nothing would snap off and break as I try to take it off the bike. Good advice indeed; take a look at the "before" photos. This is how the bike looked as I found it in the trash.

Follow the whole story as it develops: http://www.ascendant-online.net/v/Us...avId=xf5d68bc1
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Old 07-08-07, 01:05 PM
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I wouldn't soak that chain in WD40. I would hang it on the shop wall as is to remind you to oil future chains.

Gook luck with your project!
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Old 07-08-07, 01:22 PM
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The model is neither an SHA or SHC, but an RM-40. This model replaced the SHA as the entry level model in the late 1970s. The presence of the Eagle II on this model indicates it is no older than 1977. You can narrow down the year using the using the date codes that will be stamped on many of the components. The Vintage-Trek website has an excellent resource page ( http://www.vintage-trek.com/component_dates.htm ) for interpreting these codes.

Last edited by T-Mar; 07-08-07 at 01:27 PM.
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Old 07-08-07, 02:07 PM
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why would vintage trek have information on a Sekine? Is it a re-badged Trek?
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Old 07-08-07, 02:47 PM
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You can narrow down the year using the using the date codes that will be stamped on many of the components.

If you know how old the components are, you can find out how old the bike is.
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Old 07-08-07, 03:05 PM
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ricohman
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Are you planning on buying chro-mo tubes and using the Sekine lugs?
Why not buy a used chr-mo frame and start from there? It would be cheaper and would save you from having to build a frame jig
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Old 07-08-07, 05:27 PM
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Thanks for all that info guys! But first, another question: how do I get cottered cranks off? These are really resisting any effort (mallet) and I hate to try harder when things don't budge- it usually means that I'm doing something wrong. Thanks in advance.


McDave: Yeah, I gave up on the chain! It'll make a nice retrospective piece in the shop for sure.

T-Mar: Thanks for that link- I'll check my bike again (I don't remember seeing those codes...)

Richoman: I was planning on buying both chromo tubes AND lugs - I'm not messing with the Sekine frame... I kinda like it! The "build" project is for a "custom" bike of my own. The "rebuild" project with the Sekine is meant as an intro into road cycling (I was a HTer) and a way to keep my hands busy.

Update:
I've finally gotten all the parts off the frame; save the stem/headset/fork and seat post since I am missing the tools required. Tomorrow I'm cleaning up some of the components with Varsol, as a start to the overhaul (new springs, bearings, bolts, nuts, washers, etc...). Should be fun. I'll take some "before and after" photos.
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