1. Gt Bike Serial Number Decoder

Mongoose serial numbers were first and then GT serial numbers. When rebuilding and restoring old BMX bikes it's extremely helpful to know exactly how your bike is. This post is intended to be used as a helpful guide to help read your Redline serial number and find out what year your new school Redline BMX was built and sold in bike shops. I have an all original (as purchased) GT Mach One, but I can not find typical info a serial number and other stampings usually provide. Can any of you steer me in the right direction to help decipher what my serial numbers say about my bicycle? I’ve listed them below so they’re easy to see and copy. I bought it in 2001, I believe. Re: dyno serial numbers « Reply #8 on: October 04, 2013, 08:38 PM » I have a NOS Dyno Slammer frame here and that's a 1995 with the figure 4 stamped that in GT Terms means Pro or full size frame. U can buy it if your a Dyno man. A simple guide to help you check the serial number on your old GT BMX and find out what year it was built and sold. This serial number guide is for mid school and new-school GT BMX bikes made between the mid 90’s to mid 2000’s.

Anything youve noticed me leaving out please post it. Heres a collection of serial number examples to help you figure yours out.
Early Santa Ana serials, rear dropout.
31765 Can be found both with as well as without a model abreviation nearby. 3 for the third month March. 1 for the year 1981.
Santa Ana serials, rear dropout.
7841112 with a model abreviation stamped nearby.(3, 4, L4, Jr, FS, I, M1, M1M, PE, JPE, XL, XXL, XL E, 24, F) 7 for the 7th month July. 84 for the year 1984. Same code in the 1990s as well.
GT6842174 without a model abreviation. GT for GT. 6 for the sixth month June. 84 for the year 1984.
GT00185 without a model abreviation. GT for GT. 001 for the production #. 85 for the year 1985.
If the serial is just like these on the rear dropout but without a model abreviation its also US made, but in Huntington Beach.
7872459 without a model abreviation. 7 for the 7th month July. 87 for the year 1987.
Japanese serials.
Some of the Japanese factory's stamped the serial's on the rear dropout.
5X02157 with a baseball symbol. 5 for the year 1985.
5L0139 with a baseball symbol. 5 is for the year 1985. L for the 12'th month December.
GH891203267 G for the production line. H for the factory. 89 for the year 1989. 12 is for the 12'th month Dec. 90 model.
DH900413372 D for the production line. H for the factory. 90 for the year 1990. 04 is for the 4'th month April.
Some of the Japanese factory's stamped the serial's on the bottom bracket.
65J03205 6 for the production line. 5 for the year 1985. J for the 10'th month October.
G5I2981 G for the production line. 5 for the year 1985. I for the 9th month September.
F6026521 F for the production line. 6 for the year 1986. 02 for the 2nd month February.
T8040164 T for the production line. 8 for the year 1988. 04 for the 4th month April.
KS89111512 K for the factory. S for the production line. 89 for the year 1989. 11 for the 11th month November. 90 model.
Taiwanese serials, usually on the bottom bracket. Sometimes they are on the rear dropout though.
DS6I2760 DS for the Factory. 6 for the year 86. I for the 9'th month September.
DS7122150 DS for the factory. 7 for the year 1987. 12 for the 12'th month December. 88 model.
N0573129 N for the production line. 0 for the year 1990. 5 for the 5'th month May.
KGH1E3951 K for the factory.GH for the production line. 1 for the year 1991. E for the 5'th month May.
KG2A00220 K for the factory. G for the production line. 2 for the year 1992. A for the 1'st month January.
This one is made in the same Kinesis factory in Taiwan as the last two.
KGCG02419 K for the factory. GC for the production line. G for the 7'th month July and C stands for Year 1993.
Most foreign serials decode the same as those do but have different numbers of digits and letters.
YC96H39112 YC for the factory. 96 for the year 1996. H for the 8th month August.
YC4H3221 YC for the factory. 4 for the year 1994. H for the 8th month August.
ACI4L01724 AC for the factory. I for the production line. 4 for the year 1994. L for the 12'th month December, 95 model.
FY96133615 FY for the factory. 96 for the year 1996.
S8IY14150 S for the factory. 8 for the year 1998. I for the 9th month Sept. Y for the production line.
8Y6J03148 8 for the production line. Y for the factory. 6 for the year 1996. J for the 10'th month October, 97 model.
SY6A000250 S for the factory. Y for the production line. 6 for the year 1996. A for the 1'st month January.
IG9D0211 I for the factory. G for the production line. 9 for the year 1989. D for the 4'th month April.
Heres a couple foreign serials that are different than the others.
HM160798Q HM for the factory. 6 could be for the year 1996. The Q at the end is for the production line. The one I saw with this serial number is a 97 which tells me the 6 could mean it was built in late 96 as a 97 model or there is no build date whatsoever in it.
LS167495 LS for the factory. 1 for the production line. The one I saw with this number was a 94. Which means theres no build date in this serial.
GT serials info page:
http://bmxmuseum.com/bikes/info/122/

Last edited by Johnnny (2013-08-24 12:58pm)

Aermacchi VIN System:

VINs look like this example: “AERDAV350NE191301DGM10944 OM“

• AERDAV = Aermacchi Harley-Davidson;
• 350 = That is the cubic centimeters of the Engine = 350cc;
• N = Identification of the 350cc 4-Stroke bikes
• NE = Identification of the 350cc 4-Stroke bikes with electric start (73/74 SX/SS 350cc)
• These digits are the Production VIN;
• DGM = Direzione Generale Motorizzazione which is like Department Of Transportation, so DGM is the Italian equivalent of DOT
• These digits are the “omologation” number
• OM = omologation

Gt Bike Serial Number Decoder