There is no serial number under the bottom bracket of this 1996 Specialized M2 Pro

Specialized.jpg

and I haven't found it anywhere else. Where is it hiding?

Under the BB or the dropout are common sites, may be under thick paint.
all else fails ask the dealer..

If the bike was stolen at one point, it's possible the serial number has been ground off and painted over.

I have a mid-'90s Specialized that has numbers on the inside of the left dropout (not sure if it's the serial # or not.) You might have to take off the rear wheel and clean up the area to read them.

The headtube is another possibility, but I doubt it.

check the inside of the derailleur hanger

Look under the bottom bracket plastic cable guide. I've found a bunch of serial numbers under them.

What he said. That's where it is on my BMC.
Anyone noticed some of the new bikes are cheaping out and putting them on a barcode label on the underside of the downtube now? Heatgun and the bike's untraceable. Bah.

Unless the barcode lable is under the clearcoat. That would make it hard to remove without obvious damage.

It was on the inside of the rear dropout, derailleur side. Thanks for saving me some searching time.