The 3rd letter corresponds to the year of manufacture. Mid-school Mongoose BMX bikes built through most of the 90’s have a serial number that begins with 4 letters.

This is not always the case and there will be some bikes that do not fit into this formula. Mongoose serial numbers are usually found stamped on the bottom of the bottom bracket. I spent quite a bit of time looking into these numbers on a few of my bikes as well as checking against other Mongoose BMX owners to see if my serial number crack was right. There are much more difficulties when looking at Mongoose serial numbers through the 1990’s and 2000’s. There were a few variations on this type of serial number, but usually they were pretty easy to work out.

It is assumed that the G0652 is the production number. The next letter relates to the month (E) is May based on the convention January (A), February (B), March (C), April (D), May (E), June (F), July (G), August (H), September (I), October (J), November (K), December (L). The first number (6) relates to the year – 1986. For example my 1986 Mongoose Expert has a serial number M6EG0652. Generally the year and month of build was stamped as the first part of the serial number. Older Mongoose bikes made through the 1980’s had pretty easy serial numbers. It seemed nobody figured out how to read the serial numbers. The problem was there was no information helping to date Mongoose BMX bikes built from 2000 onwards. However, there are a few BMX restorers who have painstakingly attempted to decipher these multi-digit mysteries.Ī big part of buying, rebuilding and restoring old BMX bikes, is knowing exactly how old they are. When I started looking into finding out how to read Mongoose serial numbers I found plenty of information on Mongoose BMX bikes made in the 80’s and early nineties through google and BMX forums. Mongoose serial number information has never really been properly documented, possibly lost as the company changed hands and moved production. There were many different factories making Mongoose BMX bikes and all had different serial number codes. The guide covers many serial numbers but not all. Find our what year your BMX was built and sold and date mid school and new-school bikes made between the mid 90’s to mid 2000’s. Your guide to old Mongoose serial numbers.

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