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Sekai GT2700

Old 11-24-18, 05:19 PM
  #1  
phtomita
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Sekai GT2700

Finally got it built with modern components (ahenm - still some unfinished parts...) - Serial 77G90047.

Today got to a nice ride after rain has stopped.

Everything came out good imo for a first build and the only part that am not that happy are the breaks - using the original calipers to have room for fenders and they are quite heavy compared with the breaking experience on my Nishiki (all 105).


For the Sekai I got a complete Ultegra 6700 with brifters, crankset (50/30T, 165mm), cassette 12-30T, front and rear derailleur (short cage). Break calipers are not installed.

Shimano A530 pedals, Terry Nitto M1104 370mm, Araya 27" rims with Conti Ultra Sport II 27" 1 1/4 and full SKS fenders with my milk jug flap .

Also my first wheel building for the rear on Shimano RS400 hub (11 speed compatible) - it was somehow easier than I was thinking - still not 100% true though.

Cold set the frame from 120 to 130mm and since the chain stays are not the same on left and right, have to do some jumping on the non drive side .










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Old 11-24-18, 06:06 PM
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One of my first projects was a Sekai 2700 and one that I actually completed. A bit large for me but still have it. Mostly original aside from the consumables. replaced the barends with DTs and hoods/levers are new. There is a Sekai database here in C&V.



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Old 11-24-18, 10:41 PM
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Originally Posted by phtomita View Post
- using the original calipers to have room for fenders
Are those Gran Comp? Those are really good I had those on my high school bike, in the early 80's cough cough. It was a great set until I got doored, ouch! Dang I hadn't thought about that in long time.
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Old 11-25-18, 11:52 AM
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The Sekai 2700 is one of those fantastic sleeper bikes that few know about. Yours looks like a great example!
Are you still using the over 30-year old pads on those new Ultegra calipers?
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Old 11-25-18, 06:04 PM
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Originally Posted by Hudson308 View Post
Are you still using the over 30-year old pads on those new Ultegra calipers?
The other way, I am using the Ultegra shoes + pads on original Gran Comp calipers - there is still life left on used 6700 set I got.
I've ordered new rubber for breaks but didn't arrive yet.
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Old 04-21-19, 01:47 PM
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Started re-building the Sekai GT2700 that got stripped out in favor to Centurion ProTour15 and Nishiki Tri-A.

So, today was trying to re-build the rear wheel with old hub and was pretty sure it was a 3-cross since the front wheel is laced on 3-cross.
Finish all the lacing and something is not right.....
So, got a close look at the pic of when I got the bike and … It is a 4-cross on rear wheel.

Well, more re-do = more fun and dirty hands.

Got a nice Shimano break levers to go with and the Futura saddle that came with the Centurion ProTour15.
The Terry Nitto handlebar, SKS fenders will stay there.
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Old 04-21-19, 07:54 PM
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Love old Japanese bikes. They're so easy to modify. Plenty of sources for brand new threaded parts. Good stuff. Have fun.
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Old 04-26-19, 10:19 AM
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Yesterday after dinner fixed my wrong 3x lacing to 4x and got my hands dirt, of course.
I have halfway tension-ed spokes and did a spin on the wheel .... boy, never saw a wheel that wobble....

Next, truing fun time
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Old 05-05-19, 11:17 AM
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Finished truing the rear wheel, and adjusted front too.
Crankset (52/40T), downtube shifter, derailleurs and rear freewheel 5 speeds, 14-17-21-26-32.
Original freewheel was an 13 to 24 teeth that was disassembled and to provide the core to the big one since that was not screwing right into the hub - it looks like the threading is different.

I did a quick ride (don't have the brakes installed yet) and it shifts ok with the friction levers, but sometimes jumps because of huge teeth difference when trying to go lower.
Going upper moves one by one.

My truing "stand"




Frame, fork, headet + seat post - hunmmm. quite heavy.
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Old 05-05-19, 11:31 AM
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Great job, love to see Sekai's modernized.
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Old 05-05-19, 11:46 AM
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Originally Posted by RaleighSport View Post
Great job, love to see Sekai's modernized.
Actually I am putting the original drivetrain back - this frame is one size big for me.
I will finish rebuilding the pass forward.
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Old 05-05-19, 11:48 AM
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My 2500 was too big for me as well... but I stripped it down for spares for my 2700
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Old 05-12-19, 08:17 PM
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Finish rebuild of the Sekai and went for a short ride today afternoon. Yes, downtube shifter + friction is really not my thing - I got spoiled with brifters and modern drivetrain, but like very much the old steel frames.
As mentioned the frame is one size big for me - and heavier than other of my bikes. I just posted on CL.




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Old 05-12-19, 09:18 PM
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@phtomita you might take a look at the this thread for inspiration of classic steel frames with modern drive trains plenty of racey steel frames out there that will hold their own on the weight side of things
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Old 05-12-19, 10:36 PM
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Originally Posted by ryansu View Post
@phtomita you might take a look at the this thread for inspiration of classic steel frames with modern drive trains plenty of racey steel frames out there that will hold their own on the weight side of things
Thank you for the thread link - looks a great thread .
As I mentioned, the Sekai was to be my commuter and have used it from around mid November to February this year. It happens I found the ProTour on my size and am enjoying it on my commute.
Have to open some space on the garage
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