Originally Posted by
CHenry
Before the age of identity theft and general paranoia, bike owners had crazy stuff like their social security numbers, names and drivers license numbers engraved or hammer-stamped into their bottom bracket shells. If you clean off that putty (epoxy putty?), you might find such a thing.
That's true; hadn't thought about that. Now, if you fine the numbers 4 8 15 16 23 42, get rid of the bike immediately. It's cursed, man, the numbers are cursed.
But seriously, if it's not a serial number, you can either file it down or fill it back in. Most likey, tho, it is a serial number.