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Asian Serial Number Guide

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Asian Serial Number Guide

Old 06-20-24, 10:26 AM
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Originally Posted by Insidious C.
Coincidentally, another Sekai model 2700 was posted here as a mystery bike just days ago. I misidentified it as a Fuji based on the s/n. Post 1 shows Fuji as one of several companies that manufactured bikes for Sekai. You probably already figured it out, but your Sekai looks like it was made by Fuji.
Discovered the fork is bent on the Sekai 2700. Steerer is 198mm which is a bit longer than all the other 23" bike forks I measured, most were about 180mm. I found a replacement on a Taiwan built Raleigh. Model name not on the frame but it might have been a Rapide. The Sekai fork was half chrome and the Raleigh fork has no chrome but it looks close enough. Next up is some silver paint for the Raleigh fork.



Bent steerer on a Sekai GT Deluxe 2700


Bent steerer on a Sekai GT Deluxe 2700


Fork on a Sekai GT Deluxe 2700


Bent steerer on a Sekai GT Deluxe 2700 steeerer length 198 mm


rubbing on lower bb cup, cracks in the paint. Bent steerer on a Sekai GT Deluxe 2700

Last edited by rickpaulos; 06-20-24 at 10:30 AM.
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Old 06-20-24, 10:45 AM
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More photos of the 1989 Fuji Ace serial number.

Looks like all the characters were stamped pretty evenly depth wise. The first 3 looks like it was a modified 3 or 8 die. Not as fully formed as the other 3s. Doesn't appear to be an 8 stamped an angle.

Both Suntour deraillers are EI (1988 - May).
The Suntour Edge right crank is marked SR 88 H (august?) made by Sakae Ringo.

The wheels look like newer replacements. A brand I'd never heard of before.

Left crank is a SR-Suntour XCT with a code of 4B. another replaced part. Hum, need to double check the length.

This bike may be getting a flat bar conversion. There is nearly no local demand for old dropped bar bikes. Add some stem shifters, non-V-Brake mtb levers and it would look more like a hybrid. The heavier wheels are more suited for this area.






3 or 8?


Last edited by rickpaulos; 06-20-24 at 10:51 AM.
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Old 06-24-24, 06:02 AM
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This thread is so awesome

Iím back on Bike Forums after more than a decade away and itís so refreshing to dive back into this community.

My girlfriend and I drove by a neighborís house yesterday who had just set out an old lugged orange/brown steel framed roadie wih a ďFREEĒ sign. While the bike has certainly seen better days, I immediately lit up, stopped the car, and told my girlfriend that we just found her an awesome new bicycle.

The bike has a Bianchi badge but very little else for identification. It has Suntour Allegro derailleurs, DŪa Compe brakes, and a Silstar crank. From this thread, the serial number: KS07473 indicates it was made pre-1975 by Kawamura. Very cool.

How a Japanese manufactured Italian branded bicycle winds up at the tip of Long Island, NY 50 years later , I have no idea, but I am so stoked to spruce it up and ride it around with my girlfriend. Maybe Iíll ask the neighbor where he got it once itís back in great shape, but I think weíll probably just give it a new chapter to its story.

Cheers, and thank you for this awesome thread! Weíll see you in the Bike Mechanics forum 🔧


Last edited by hank scorpio; 06-24-24 at 06:22 AM.
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Old 06-29-24, 11:13 PM
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Originally Posted by hank scorpio

The bike has a Bianchi badge but very little else for identification. It has Suntour Allegro derailleurs, DŪa Compe brakes, and a Silstar crank. From this thread, the serial number: KS07473 indicates it was made pre-1975 by Kawamura. Very cool.
Hello hank scorpio,

welcome back to the forum.

I would suggest that the serial number for your Bianchi is not from Kawamura. Rather it is from Oji Bicycle Factory in Tokyo, Japan.

The letter "K" at the start of the serial number is for the month of frame manufacture, November. The first digit "0" is for the year of Frame manufacture, 1980.

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Old 07-02-24, 09:01 PM
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Thatís interesting. I donít see anything about Oji Bicycle Factory online - any chance you have more information?

I decoded it as Kawamura browsing the initial post of this thread but may be reading things wrong.

i appreciate the help. I need a few more posts before I can post pictures.
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Old 07-04-24, 02:56 AM
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Hi. I have found a Koga Miyata Randonneur Extra, with a color scheme of 1990 (as per catalog).
The serial number should match a Miyata or does Koga when importing frames stamped its own?
If I read correctly here on the forum the frame they were using in Netherlands was an '86 Miyata 1000, but SN doesn't match that year, I think.

my sn is RS44043


thanks

Last edited by morom; 07-04-24 at 03:44 AM.
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Old 07-10-24, 11:07 AM
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Originally Posted by hank scorpio
Thatís interesting. I donít see anything about Oji Bicycle Factory online - any chance you have more information?

I decoded it as Kawamura browsing the initial post of this thread but may be reading things wrong.

i appreciate the help. I need a few more posts before I can post pictures.
It is unlikely that you will find any English language information on Oji Bicycle Factory. I think this company manufactured various products including bicycle frames and forks. I do not think the company assembled complete bicycles.

There were several companies in Japan that manufactured bicycle frames and forks. Other companies then took the frames sets and assembled complete bicycles.

Ouji Company,Ltd is the current company, but they no longer manufacture bicycle frames or components. The company has a website and the URL contains Japanese characters. This forum will not allow a link to that website.

Japan's Bicycle Guide 1972 shows Ouji fork crowns.

Japan's Bicycle Guide 1979 shows three Oji frames.
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Old 07-10-24, 11:20 AM
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Originally Posted by morom
Hi. I have found a Koga Miyata Randonneur Extra, with a color scheme of 1990 (as per catalog).
The serial number should match a Miyata or does Koga when importing frames stamped its own?
If I read correctly here on the forum the frame they were using in Netherlands was an '86 Miyata 1000, but SN doesn't match that year, I think.

my sn is RS44043


thanks
Hello morom,

welcome to the forum. The serial number that you quoted is a match for a Miyata frame manufactured in 1989. So a 1990 model year is very likely.

In general the frame manufacturer stamps a serial number into the frame. Sometime the distribution companies also stamped characters into the frame.
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Old 07-12-24, 03:19 AM
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Originally Posted by Hummer
Hello morom,

welcome to the forum. The serial number that you quoted is a match for a Miyata frame manufactured in 1989. So a 1990 model year is very likely.

In general the frame manufacturer stamps a serial number into the frame. Sometime the distribution companies also stamped characters into the frame.
That's what I imagined, Koga stamped KM on the fork but serial number is Miyata.
Anyway it's interesting because it has 130mm spaced vertical dropouts, that only appeared on the 1986 Miyata 1000 and then disappeared.

So it appears Miyata produced frames to spec for Koga, instead of Koga just buying frames and add changes (internal cable routing for example)?
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Old 07-12-24, 09:44 PM
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It said Bridgestone on the repair tag, but now I donít know.

serial number M8L 92350
here are pics:

I excitedly thought MB-0






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Old 07-13-24, 08:34 AM
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Originally Posted by Robvolz
It said Bridgestone on the repair tag, but now I don’t know.

serial number M8L 92350
here are pics:

I excitedly thought MB-0




Per the Asian Serial Number Guide above, SN format appears to match both Merida (Taiwan) or Miki (Japan) vice Bridgestone. Unfortunately, it's been stripped so no country of origin sticker to help out.
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Old 07-13-24, 11:11 AM
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Itís my understanding that Japan was lugged and Taiwan was lugged and tig welded

this has a lot more tig making it Taiwan.

but, I have zero knowledge on Asian bikes.

any and all help is appreciated.
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Old 07-16-24, 03:21 PM
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Originally Posted by Robvolz
It said Bridgestone on the repair tag, but now I donít know.

serial number M8L 92350
Bridgestone frame made by Merida of Taiwan. Based on the serial number a 1989 model year.

Looks like a CB-2 or CB-3 model.
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Old 07-20-24, 01:23 AM
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Hi guys, I need help to identify my road bike brand. There is no factory brand left on the bike. But, I got the serial number that written on the bottom bracket tube.
SN: 8371646
And other clue that I got is on the drop out is written: SHIMANO SF
The bike is from the 80s.
Is there anyone can help?
Sorry I cannot post the photo, because I am the new user. Thanks
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