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This is probably not true for all of the bikes in either range, but there were a number of bikes that were identical apart from the logo stamping.

In fact look closely at many Mongoose and GT BMX’s from the around 2000 to 2010 and you’ll see many similarities in frame design and geometry. After a bit of digging around online I soon realised that GT BMX bikes and Mongoose BMX bikes were owned by the same company and also made in the same factories in Taiwan. Many of the GT serial numbers start with the same letter sequence. The placement and sequence of the numbers is stamped in the same place under the bottom bracket. It didn’t take long to realise there were many similarities when looking at GT serial numbers and Mongoose serial numbers. Once you now when the old GT BMX bike was built it’s much easier to find out what model it is and also look at the original parts lists and colours from the bike makers catalogues.Ī while back I spend some time investigating how to read mid-school and new school serial numbers on Mongoose BMX bikes.Īfter buying and restoring a number of older mid-school and new school GT BMX bikes I also need to to figure out how to crack the GT serial numbers to get the same build date information. The first thing everyone wants to know when the buy a second hand GT BMX is ‘how old is it?’ Reading the GT serial number and finding out the build date is an important part of any BMX restoration.