Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

Sekai GT2700

Notices
Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

Sekai GT2700

Old 11-24-18, 05:19 PM
  #1  
phtomita
Senior Member
Thread Starter
 
Join Date: Jan 2018
Location: Redmond, WA
Posts: 805

Bikes: '86 Nishiki Tri-A, '84 Centurion PT15, '03 Litespeed Firenze

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Liked 143 Times in 98 Posts
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 .










phtomita is offline  
Old 11-24-18, 06:06 PM
  #2  
r0ckh0und 
Senior Member
 
r0ckh0und's Avatar
 
Join Date: Jun 2009
Location: Plano, IL.
Posts: 1,544
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 112 Post(s)
Liked 97 Times in 65 Posts
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.



__________________
They say I'm lazy but it takes all my time.
r0ckh0und is offline  
Old 11-24-18, 10:41 PM
  #3  
Mr. 66
Senior Member
 
Mr. 66's Avatar
 
Join Date: Aug 2015
Posts: 2,491
Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 794 Post(s)
Liked 935 Times in 564 Posts
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.
Mr. 66 is offline  
Old 11-25-18, 11:52 AM
  #4  
Hudson308 
Mr. Anachronism
 
Hudson308's Avatar
 
Join Date: Jan 2013
Location: Somewhere west of Tobie's
Posts: 2,088

Bikes: fillet-brazed Chicago Schwinns, and some other stuff

Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
Quoted: 524 Post(s)
Liked 244 Times in 161 Posts
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?
__________________
"My only true wisdom is in knowing I have none" -Socrates
Hudson308 is offline  
Old 11-25-18, 06:04 PM
  #5  
phtomita
Senior Member
Thread Starter
 
Join Date: Jan 2018
Location: Redmond, WA
Posts: 805

Bikes: '86 Nishiki Tri-A, '84 Centurion PT15, '03 Litespeed Firenze

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Liked 143 Times in 98 Posts
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.
phtomita is offline  
Old 04-21-19, 01:47 PM
  #6  
phtomita
Senior Member
Thread Starter
 
Join Date: Jan 2018
Location: Redmond, WA
Posts: 805

Bikes: '86 Nishiki Tri-A, '84 Centurion PT15, '03 Litespeed Firenze

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Liked 143 Times in 98 Posts
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.
phtomita is offline  
Old 04-21-19, 07:54 PM
  #7  
ramzilla
Senior Member
 
ramzilla's Avatar
 
Join Date: Dec 2014
Location: Fernandina Beach FL
Posts: 3,535

Bikes: Vintage Japanese Bicycles, Tange, Ishiwata, Kuwahara

Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 689 Post(s)
Liked 282 Times in 227 Posts
Love old Japanese bikes. They're so easy to modify. Plenty of sources for brand new threaded parts. Good stuff. Have fun.
ramzilla is offline  
Old 04-26-19, 10:19 AM
  #8  
phtomita
Senior Member
Thread Starter
 
Join Date: Jan 2018
Location: Redmond, WA
Posts: 805

Bikes: '86 Nishiki Tri-A, '84 Centurion PT15, '03 Litespeed Firenze

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Liked 143 Times in 98 Posts
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
phtomita is offline  
Old 05-05-19, 11:17 AM
  #9  
phtomita
Senior Member
Thread Starter
 
Join Date: Jan 2018
Location: Redmond, WA
Posts: 805

Bikes: '86 Nishiki Tri-A, '84 Centurion PT15, '03 Litespeed Firenze

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Liked 143 Times in 98 Posts
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.
phtomita is offline  
Old 05-05-19, 11:31 AM
  #10  
RaleighSport
Hogosha Sekai
 
RaleighSport's Avatar
 
Join Date: Jun 2011
Location: STS
Posts: 6,671

Bikes: Leader 725, Centurion Turbo, Scwhinn Peloton, Schwinn Premis, GT Tequesta, Bridgestone CB-2,72' Centurion Lemans, 72 Raleigh Competition

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Likes: 0
Liked 20 Times in 14 Posts
Great job, love to see Sekai's modernized.
RaleighSport is offline  
Old 05-05-19, 11:46 AM
  #11  
phtomita
Senior Member
Thread Starter
 
Join Date: Jan 2018
Location: Redmond, WA
Posts: 805

Bikes: '86 Nishiki Tri-A, '84 Centurion PT15, '03 Litespeed Firenze

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Liked 143 Times in 98 Posts
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.
phtomita is offline  
Old 05-05-19, 11:48 AM
  #12  
RaleighSport
Hogosha Sekai
 
RaleighSport's Avatar
 
Join Date: Jun 2011
Location: STS
Posts: 6,671

Bikes: Leader 725, Centurion Turbo, Scwhinn Peloton, Schwinn Premis, GT Tequesta, Bridgestone CB-2,72' Centurion Lemans, 72 Raleigh Competition

Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Likes: 0
Liked 20 Times in 14 Posts
My 2500 was too big for me as well... but I stripped it down for spares for my 2700
RaleighSport is offline  
Old 05-12-19, 08:17 PM
  #13  
phtomita
Senior Member
Thread Starter
 
Join Date: Jan 2018
Location: Redmond, WA
Posts: 805

Bikes: '86 Nishiki Tri-A, '84 Centurion PT15, '03 Litespeed Firenze

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Liked 143 Times in 98 Posts
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.




phtomita is offline  
Old 05-12-19, 09:18 PM
  #14  
ryansu 
Ride.Smile.Repeat
 
ryansu's Avatar
 
Join Date: May 2011
Location: Seattle WA
Posts: 2,870

Bikes: 2009 Handsome Devil, 1987 Trek 520 Cirrus, 1978 Motobecane Grand Touring, 1987 Nishiki Cresta GT, 1989 Specialized Allez Former bikes; 1986 Miyata Trail Runner, 1979 Miyata 912, 2011 VO Rando, 1999 Cannondale R800, 1986 Schwinn Passage

Mentioned: 72 Post(s)
Tagged: 0 Thread(s)
Quoted: 795 Post(s)
Liked 520 Times in 366 Posts
@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
ryansu is offline  
Old 05-12-19, 10:36 PM
  #15  
phtomita
Senior Member
Thread Starter
 
Join Date: Jan 2018
Location: Redmond, WA
Posts: 805

Bikes: '86 Nishiki Tri-A, '84 Centurion PT15, '03 Litespeed Firenze

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 230 Post(s)
Liked 143 Times in 98 Posts
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
phtomita is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
AliH
Classic & Vintage
22
05-22-19 11:07 AM
Fahrenheit531
Classic & Vintage
14
03-17-19 01:48 PM
agmetal
Classic & Vintage
3
01-18-16 10:21 AM
The MAX
Classic & Vintage
1
04-20-11 08:01 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.