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Rebuilding Sekine, more questions

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Rebuilding Sekine, more questions

Old 08-28-05, 02:56 PM
  #1  
Vuroth
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Rebuilding Sekine, more questions

Ok, the Sekine is now completely apart. The bottom bracket and headset were being sticklers, and not having ever seen inside them before, we kept looking for a trick. Turns out all that was needed was a good whack.

The next steps are to refinish the frame (paint (blue) is stripped, primer nearly so - then we have to repaint) and clean up the components. Most of the components will go back on as is, but a few will not.

First of all, the seat got tossed. It was awful. Are seatposts universally sized, and have they been so forever (bike is likely 70s, I'm guessing)? Can I pick up any modern/vintage seat and throw it in? Should I be measuring the seat tube diameter?

Next, the reason the bike was in the trash in the first place - I need to replace the stem. The original step, an SR, had the handlebar bracket broken. All I know about stems I learned by looking at this one, so I'm unclear what to spec to replace it? Do I need to have intimite knowledge of the headset layout in order to spec a new one? Do I have to get one the same diameter? Are they universal?

Finally, the "bearing joints", the headset and the bottom bracket, have been taken apart. The bearing regions were very "gunky", for lack of a better word. I'm hoping they'll clean up alright, but if the bearings are damaged, where's the bets place to go to replace them? Bike shop? Hardware store? (Ditto for lubricant, I guess.)

Last but not least. In the "reassembly" phase, what intimidates me the most is the bottom bracket. The SR pedals seemed to run in some kind of clear (plastic?) housing, which contained the ball bearings. (It's hard to tell for sure, 'cause the whole assembly was black and gooey.) Everything appears functional, but difficult to picture a painless re-assembly. Are modern bottom brackets more or less the same, or is it possible to get an all-in-one housing? (There's got to be an easier way to do this....) The pictures I could find of bottom brackets did NOT look like what I pulled out of the Sekine.

It's been a fun learning experience so far, but there's a long way to go.

V
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Old 08-28-05, 03:19 PM
  #2  
AndrewP
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There are several standard diameters for seat tubes, fork steerer tube, and handle bars. So you need to measure them all to get parts that fit each other. You will also need to consider the length of the stem you want protruding above the headset as well as the distance forward to the bars. The plastic sleeve in the bottom bracket was to keep rain and dirt out of the grease and bearings. It is not essential for operation.
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