![]() ![]() 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 hundreds of bikes mine as well as other Mongoose BMX owners to see if my serial number crack was right. Mongoose serial numbers through the 1990’s and 2000’s are much more complex. There were a few variations on this type of serial number, but usually they were pretty easy to work out. The last numbers after the month - 0652 are the production line number. The fourth digit is the production month G = July 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 second digit is the the year - 6 = 1986. The first digit is the factory code - M = Merida. For example my 1986 Mongoose Expert has a serial number M6EG0652. Generally the year, model and month of build was stamped as the first part of the serial number. Late 1980’s and a few very early 90'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. Triumph Alpha-Numeric prefix numbering system started in 1969Ī Triumph T140V with a motor number of T140V NP79000 would have been manufactured in October 1976 (N) for the 1977 Model year (P).Your guide to old Mongoose serial numbers. Military – TRW Military 500cc Side-Valve Twins YEARġ950 to Current engine and frame numbers match DATE Thanks to Dave Gaylin and Lindsay Brooke for printing the above information in their book “Triumph in America”. By 1950 frame and engine numbers were matching. TR5 models had separate number series engines from 101001 to 106424, frames from TC11001-T to TC13107-T. Note: All Grand Prix T-1 00’s have letter ‘R” suffix following engine and frame numbers. TR5 models did not have separate number series but ran concurrently with all other models. TR was followed by a ‘T” after the actual number. Frame prefixes were ‘TL” for the 3T up to 1948 and TC for 1949. This practice followed religiously and some single prefixes may appear on postwar models. Year shown in engine number prefix with two figures. “TF” for the T-I00 and later 39/40 Speed Twin. Frame prefixes were-“TH” for early Speed Twin. For example 8-T-33445 is a 1938 Speed Twin (later identified as “5T” instead of just “T”). Year and model shown as prefix to engine number. ![]()
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