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Bridgestone RB-1 number

Old 11-25-21, 12:59 PM
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Bridgestone RB-1 number

I've got this "known to be" 1992 RB-1 road bike on my stand right now. I've got the catalog for that year and it all checks out except for one thing. The frame number does not match the resources I have seen for Bridgestone bikes. Maybe I didn't get the right resource to consult. Any thoughts?




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Old 11-25-21, 02:21 PM
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Yeah that's a '92 paintjob and yeah starting with an X like your number does throws all the B'stone SN decoders stating A-L tells you the month it was made out of whack. My '93 has 7 digits after the letter to tell the day it was made and such. So yours differs from the norm there too. But I bet you've heard this all before. Have you been to the Bridgestone Owners Bunch on Facebook? There's a couple guys there who know this SN stuff in and out. Good luck...
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Old 11-26-21, 06:52 AM
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While Grant Peterson is on record as stating that the alpha characters, represent months, I believe that they are actually fortnights. That would make make the frame manufacture during weeks 47-48 of 1991, which is certainly late enough in the calendar year to be a 1992 model.
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Old 11-26-21, 10:36 AM
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Originally Posted by T-Mar View Post
While Grant Peterson is on record as stating that the alpha characters, represent months, I believe that they are actually fortnights. That would make make the frame manufacture during weeks 47-48 of 1991, which is certainly late enough in the calendar year to be a 1992 model.
So far the experts over at the BOB group on Facebook agree that it was a "built in 91" as a 92 model but are confused by the rest of the number. Here is an excerpt.

"The 1 means it was made in 1991. No doubt itís a 92 model but it was likely made in late 91. The first letter is usually an A-L which signifies the month however there were frames stamped X or M and Iíve never seen an explanation."

If the X means it is a custom order then that likely puts the rest of the number as a non standard method, except for the second digit (1) which indicates 1991.
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Old 11-26-21, 10:54 AM
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The '92 RB-1 I used to own had a serial number of X124108.
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Old 11-26-21, 11:40 AM
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Originally Posted by rjhammett View Post
The '92 RB-1 I used to own had a serial number of X124108.
Was your bike a custom order?
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Old 11-26-21, 12:43 PM
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Originally Posted by Oldairhead View Post
So far the experts over at the BOB group on Facebook agree that it was a "built in 91" as a 92 model but are confused by the rest of the number. Here is an excerpt.

"The 1 means it was made in 1991. No doubt it’s a 92 model but it was likely made in late 91. The first letter is usually an A-L which signifies the month however there were frames stamped X or M and I’ve never seen an explanation."

If the X means it is a custom order then that likely puts the rest of the number as a non standard method, except for the second digit (1) which indicates 1991.
I've been collecting Bridgestone serial numbers for quite some time. I've seen a lot letters beyond L, besides M and X, probably around 18 different letters in total and about 8 beyond L. The first numeral does appear to be the calendar year indcator. That would make the letter prefix a fortnight indicator. The remaining number string, typically 5 characters, is likely a sequential frame numbering for the fortnight.

It's possible that at one time the letter prefix was a month indcator but they may have converted to a fortnight indicator once the monthly volume started exceeding 99,999 frames.

Last edited by T-Mar; 11-26-21 at 12:59 PM. Reason: changed capacity to volume
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Old 11-26-21, 12:48 PM
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Thanks @T-Mar, I will consider the mystery solved.
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Old 11-26-21, 01:07 PM
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Originally Posted by Oldairhead View Post
Was your bike a custom order?
I was not the original owner so I donít know.
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Old 11-26-21, 08:13 PM
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I am not aware that Bridgestone ever made customs. The 1992 catalog discussion of the RB-1 touts their geometry, but certainly doesn't say anything about doing custom builds. It does say you can take their geometry to a custom builder if you want to. FWIW, that sounds to me like customs were not on the menu, at least not for 1992..

And as usual, my opinion is worth exactly what you are paying for it . . . .
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