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What bike is this?

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What bike is this?

Old 09-04-20, 05:08 PM
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shortybiscuit
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What bike is this?

Hi. I was recently given what looks to be a vintage Sekai??? competition bicycle. I'm trying to get more info on it. Any help would be greatly appreciated. There is a Suntour V-T LuxeRear Derailleu with 4532 etched on it. 10 Speeds. There is a sticker on the head tube that says Sekai. The number N157 is etched at the bottom of the seat tube. The handlebars say SAKAE Custom Road Champion.

I can provide photos if needed - but seems that since I'm new I can't add them now or a URL.
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Old 09-04-20, 05:28 PM
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Pic Assist.

https://www.bikeforums.net/g/picture/19046908






Last edited by cb400bill; 09-04-20 at 06:24 PM.
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Old 09-04-20, 05:34 PM
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Thanks for the assist!

Originally Posted by cb400bill View Post
Pic Assist




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Old 09-04-20, 06:23 PM
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Sekai bicycles

The Sekai company itself was a small family owned importer of Japanese goods and Sekai bikes and frames. It grew out of a store called Velocipede which still exists and is owned by the same family.
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Old 09-04-20, 07:53 PM
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Should make a great riding utility bike and gateway drug to the world of C&V. Welcome
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Old 09-04-20, 07:58 PM
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Now to learn how to fix and tune up. I know I need tires, not sure what else. Feels nice when I ride it. Gears shift easily.
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Old 09-08-20, 07:06 AM
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I can't seem to find a serial number on the frame. I looked under the bottom of the frame by the pedals. Anywhere else I should look?
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Old 09-08-20, 10:16 AM
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@shortybiscuit DK - May not have one. Not all bike do.
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Old 09-08-20, 10:42 AM
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shortybiscuit lots of knowledge here of course for doing a rebuild, also check out Sheldon Brown on the web, RJ the bike Guy on YouTube and also Park Tools on Youtube. Have fun and welcome to the forums.
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Old 09-08-20, 11:00 AM
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What's interesting is that the N157 format and its location is consistent with the early Centurion that were reportedly manufactured by Tano. Offhand, I don't recall seeing a Sekai with this format. However, to be sure, I'll check my database when I get home.

Regardless,a SunTour VT, if OEM, would place it circa 1974-1977. Stamped dropouts, brake safety levers and a nutted rear hub with what appears to be a steel rim, suggests an entry level model.
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Old 09-08-20, 11:06 AM
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Thanks Ryansu! As if I need yet another expensive hobby. I'm really liking this bike though.
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Old 09-08-20, 11:08 AM
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Originally Posted by T-Mar View Post
What's interesting is that the N157 format and its location is consistent with the early Centurion that were reportedly manufactured by Tano. Offhand, I don't recall seeing a Sekai with this format. However, to be sure, I'll check my database when I get home.

Regardless,a SunTour VT, if OEM, would place it circa 1974-1977. Stamped dropouts, brake safety levers and a nutted rear hub with what appears to be a steel rim, suggests an entry level model.
Ha. So I don't know what dropouts are or brake safety levers, much less nutted rear hub. LOTS to learn. I've only ever had cheap Huffy bikes that I use to go to do errands and an occasional park ride.
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Old 09-08-20, 12:01 PM
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Looks almost identical to my 1977 Sekai 500, but an older headbadge
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Old 09-08-20, 12:09 PM
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Originally Posted by coolkat View Post
Looks almost identical to my 1977 Sekai 500, but an older headbadge
Oh! Have pics?
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Old 09-08-20, 02:31 PM
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I've done some cleaning and have more info - maybe its a Frankenbike

In addition to the rear derailleur saying Suntour VT Luxe with 4532 etched on it , I can now say that the front derailleur says Compe-V. The brake levers say DIA-compe on them. The rims say Araya 27 1/4 x 1/14 w/o HP.
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Old 09-08-20, 02:53 PM
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Originally Posted by shortybiscuit View Post
I've done some cleaning and have more info - maybe its a Frankenbike

In addition to the rear derailleur saying Suntour VT Luxe with 4532 etched on it , I can now say that the front derailleur says Compe-V. The brake levers say DIA-compe on them. The rims say Araya 27 1/4 x 1/14 w/o HP.
That's all good stuff, the nutted axle is a solid axle with nuts instead of a hollow axle with a quick-release lever's skewer going through it. Be sure to put oil on the axle threads at the nuts, so that the axle doesn't try to spin while tightening or loosening the nuts (that might cause the axle bearings to loosen or tighten, not good!).

The dropouts are the slotted plates on the frame that the axles slide into. Better bikes have thicker metal there instead of just stamped flat-stock.

Interesting to learn that Sekai was another American brand. I had a Sekai 500 that was a competent bike with a triple crankset to keep me amused while riding (albeit at modest speed).
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Old 09-08-20, 03:18 PM
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The bike in question is a 400 series from 77 or so the 500 was similar but had alloy wheels with quick release. I had one a while back that I did a bit over the top rebuild on for the clunker challenge on the low end but very nice riding bike with with fairly well built frame and good paint so worth fixing up.
Sekai 400 fully rebuilt updated with Sora 8x3 STI's and nice 700c wheels.
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Old 09-09-20, 09:50 AM
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More updates - I think it was made in 1974Brakes: dia compe drop forged. Rear 74-7 (July 1974), Front: 9-74 (September 1974), Also etched on the brakes were these numbers: 5583, 610
Crank Arm: Sugino Maxy, Forged 165 49.2 = (February 1974)
Fork: SKV (sticker in shield)
Front Derailleur: Compe V, Maeda Industries, Ltd Japan QH (date code - Aug 1974)

Wish I could post pics, but I can't.
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Old 09-09-20, 05:45 PM
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I checked the database and there are no records of any other Sekai using this S/N format. Given the component date codes, it should be a 1975 model. The derailleurs, shift levers, brakes and crankset are all consistent with a 2000 Special model of the era. The only thing which doesn't match are the wheels
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Old 09-09-20, 11:34 PM
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Thanks T-Mar. I've looked at some pics of the 2000 and the decals are definitely different. Really leaning towards a Frankenbike that someone fixed up many years ago.
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Old 09-09-20, 11:34 PM
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Also, I uploaded some photos here
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Old 09-10-20, 06:55 AM
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It's common for bicycle companies, especially newer marketing brands, to change the graphics ever 2-3 years to follow trends. Consequently, unless the other 2000 were from the same period as the subject bicycle, it's meaningless to use decals as a model identifier. Also, all the component date codes mentioned span a time frame of only 8 months, suggesting they are all from the same bicycle.
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Old 09-10-20, 06:55 AM
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Originally Posted by shortybiscuit View Post
Also, I uploaded some photos here
The link is blocked. The good news is you have passed 10 post, so you can now post in the thread
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Old 09-10-20, 07:13 AM
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shortybiscuit
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Originally Posted by kermie View Post
The link is blocked. The good news is you have passed 10 post, so you can now post in the thread
UGH!!!! https://biscuitsplace.com/new-to-me-sekai-bicycle/

Apologies... these photos are HUGE.

Head badge

Rear Derailleur: Suntour VT Luxe 4532 QK (Date Code November 1974)

Seat Tube: N157

Rims: ARAYA 27 x 1 w/o HP

Fork: SKV sticker


Stem: SR CFR "5355" 74 12

Front Derailleur: Compe V

Crank Arm: Sugino Maxy
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Old 09-10-20, 07:19 AM
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10 photo limit. Here's the rest. they are also available at the link


Rear Derailleur: Suntour VT Luxe 4532 QK (Date Code November 1974)

Crank Arm: Sugino Maxy, Forged 165 49.2 = February 1974

Hubs: Front Maillard L 29 88. Rear 39 83. Made in France

Brakes: dia compe drop forged. Rear 74-7 (July 1974)

Brakes: dia compe drop forged. Front: 9-74 (September 1974), 5583, 610

Front Derailleur: Compe V, Maeda Industries, Ltd Japan QH (date code - Aug 1974)
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