Here is an email I got from an actual employee of GT:
Wna1100 driver for windows 10. If the bike frame was manufactured at the Santa Ana CA facility, the first three or four digits of the serial number should be letters abbreviating the model or size of the frame such as 'XL', 'XXL', CR24, or something like that.
The next part of the serial number is eight numeric digits. The first four numbers should be a two digit month followed by a two digit year.
The last four digits are the serialization digits 0000 to 9999 depending on what number the frame was of the years production.
List for Monark serial numbers Monark #s prior to 1941 #s deeply punched under crank housing. 3600 or under.1934 3601 to 81 to 91 to 1100 to 30000.? 30001 to 4601 to 6201 to 7901 to 100762 to 112911 to 118000.? #s on aluminum tag: starting in 1946 118106 to 2 286521 to 429920 to 539001. Here is a very nice 1947 Monark Super Deluxe 26' Ladies' Bicycle. The model number is 4416 and I believe the serial number is 027432. The bike is missing the headlight and has minor surface rust and paint scratching consistent with age of bike. See photos for details. The tank is not original to this bike. But does match the color scheme of the. Monark Sports is setting the industry standard using top class Swedish engineering to test and create exercise treadmills, exercisel bikes and other equipment to improve life and performance for athletes all over the world. In 1980-81 the hutch bmx frames had no serial #and the hutch logo was drilled out of the brake bridge. Second version(82-83) still had no serial #and the hutch logo was stamped into the brake bridge in western style font.the last version is similar to the second one but with serial #on the inside left rear dropouts these # are 7digits and are all numerical. The first batch of frames starts w.
If the frame was made overseas in Taiwan, it gets more complicated. If the number starts with a K, the frame was made by Kinesis.
That's the only one I remember off the top of my head.
There were at least four companies in Taiwan that made the GT lines :
Monark Bike Serial Numbers
Robinson, Dyno, Powerlite and Auburn included)
The first digit would be a letter designating the factory that made the frame. There might also be a second letter digit specifying the factory that assembled the bike, if applicable. The model and year of production was also coded by a letter, so you won't be able to spot a two digit month and two digit year.
Before I left, I was writing a specification to standardize all of the serial numbers because GT was starting to send most of its US production to other US fabrication shops.
The information might also come in handy for deciphering other makes because the factories in Taiwan make bikes for a lot of different companies.
I am tinkering around with the idea of starting to make my own frames, kind of on a 'one-off' basis. I am also teaching welding at a local community college.
By the way, did I tell you that the guy ran GT's in house fabrication for the last ten years (he recently retired) was none other than Gilbert Axt. Who? Do you remember Race, Inc.? That was Gilbert.
He also did the original PK Ripper for SE Racing. History, man.
It might be a really cool thing if I can track down Gilbert now and interview him for you.
THAT is the kind of stuff that belongs in the BMX Museum!
Monark Bicycle Serial Number Database
Later. I'll write you when I get a chance. Dan Garcia
Monarch Bicycle Serial Numbers
and here is the updates, thanks to love thegoose! (Michael S)
well we get a good bit of gt serials that could be identified by the owner, if they only had the tips that some of us have learned, so i will post what i know, and anyone with more knowledge can add to it.so here we go.
here is an example to go by. on the dropout you have 'M1' followed by '08922198'.this one is simple.
M1 stands for 'mach one' that is your model gt.
it can also be a 'I' for interceptor and so on.
next on the serial is '0892' this is easy to decode too,
08 means 8th month, which would be august.
then you have '92' next in the lineup, this would be 1992
the last 4 digits, are your build number, this one would be the 2,198th one built.
Here is another example. if your serial is KGCG2297 this one gets a little complicated. but still easy once you learn the code to it.
the first letter is who made the frame itself, in this case it would be 'Kenisis', an overseas company.this could be replaced by another letter but at least we know what that one is there for.
next is the letter 'G'.this isnt always there, but if so, this is where it was assembled, (ever notice the built in usa sticker on your gt or dyno?) this is what that letter is there for. it wasnt made here, but was built here.
next is the letter 'C'.C is the 3rd letter in the alphabet, and march is the 3rd month, so march is the build month.
next is the letter 'G' this is the year. G is the 7th letter in the alphabet,
so this would be a 1987.
here is one more.your serial resembles this:f6030578.
to start, if you have a 'baseball' looking stamp behind your serial, this frame was made overseas..no its not a pacific, so dont cry, or get mad..and lets continue.
on this serial, the first number is the last digit of the year, so 6 stands for 1986
next is '03'..this is the third month.which is march.
so you have a gt built in march of 1986.
but still use the museum as a guide to id the frame, cause sometimes you can find the year, but getting a posotive id on the model isnt possible without knowing which style frame you have.
this doesnt apply to new gt's, but hopefully some people with info on those will chime in. this isnt always going to match your serial, you may have a 'fake'.its not likely but it happens. also on earlier models this can differ. this is for the 2 most popular style serial's i see on here. also, common sense tells you that if you have a suspected 'gt' frame, look it up and compare it in the musuem, knowing which style frame you have will help with the process of id'ing your bike with the serial, especially if the serial has some damage that prevents you from getting the full number.
hopefully this bit of info can be used for everyone, and this will save you from those late nights sitting around waiting for a response to your post looking for an answer to the idendity to your gt..although i do feel smart and proud when i can answer these posts. well, thats it for me, if anyone else has info on serials or if you see a mistake in this guide, tell me so i can edit it. happy holidays people.
