If living well is the best revenge, I hope this bike is happy.

Last summer I rescued this 1977 Sekai 5000 Superlite from death by dumpster. (story here)

I spent the winter restoring it, and doing a little research too.


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Sekai was a small bike brand of the 70s and 80s, founded in Seattle by the one of the Tamura brothers, of the same family that owned several Seattle bike stores including Velo Bike Shop, which is still open.

“Sekai” means “the world,” “society,” or “the universe.”

The 5000 Superlite was Sekai’s top of the line racer. It seems to be quite rare (I haven’t come across another anywhere), probably because 1) it was hand-built in Japan at a rate of only 6 per month; and 2) the extremely thin tubing made it lightweight but very damage-prone.


The tubing is Tange Professional 0.6 x 0.3. It’s so thin, it squishes between your fingers and dents easily. Mine has various dings and a replacement rear dropout due to a crash or workstand clamp damage. I suppose it would be worth a lot if it weren’t so battered.



Gary Fisher tested the Sekai 5000 for Bicycling! magazine's February 1977 issue. He gave it a grudgingly favorable review (p.1, p.2, p.3), despite being put off by the thin tubing:

"After the tube-pressing demonstration I was afraid to let it all hang out. But I found good design has eliminated most of the problems inherent in this light a frame. The tight rear triangle [16 inch chainstay] and heavier down tube [0.8 x 0.5] have minimized bottom bracket flex, and the bike gives good response when the rider is thrashing away in large gears. The shallow head angle [72 degrees] eliminates that uneasy feeling at high speeds.... While I wouldn't recommend this frame to anyone but the most super-careful, weight-conscious cyclist, I certainly liked it."




Sekai sold the 5000 Superlite to dealers as a frameset only, so there is no official original build. This bike remains almost completely in “time capsule” condition as originally built at Yellow Jersey in Madison, Wisconsin. I replaced the saddle, tires, bar tape, brake pads, toeclip straps, and some cables and housings. I also rebuilt the crankset with period-correct TA chainrings (going from 49/40/28 to 52/38).



I also added this period-correct TA bottle cage (thanks Iowegian and intron!).



The Tange Levin headset was advertised as a component you "can't distinguish from Campy at 2 feet." Seems like everybody felt they had to sell against Campy.



Weyless marketed these cartridge-bearing hubs as "over 3 1/2 ounces lighter” than Campy in a 2-page photo spread ad campaign. They are laced to Fiamme Ergal yellow label tubular rims.



The seatpost and pedals are also Weyless.



The pedals look like Suntour Superbes but are apparently an earlier Bill Shook design that inspired the Suntour Superbe. They have Afa Christophe chromed toe clips.



This TA Cyclotouriste 52 tooth outer chainring is size-stamped on both sides. On the outer side, the size stamp is superimposed on the TA brand stamp. I like to think of this goof as a rare curiosity, like the famous postage stamp with the airplane flying upside down.


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Thank you to Iowegian and intron (again) for answering my iso/wtb postings, and sending me the vintage bottle cage and clamps. Also to Don Gillies for the Sekai catalog flyer; to Steve Kurt for the Bicycling! article; and to many BikeForums members for restoration and wrenching advice.