1. Mirraco Bmx Serial Number Lookup Trek bicycle frame serial numbers (SNs) are stamped into the bottom of the bottom bracket, or (more rarely) at the lower end of the seat tube. Serial Number Example: 01001PV217. Shop with Afterpay on eligible items.
2. GT serial numbers., I m All I ask is for a little serial number help, but with this being a BMX site, with knowledge on old school GT, Titan, Mongoose. Vintagebmx.com hosts a lively community of over 15,000 members who come together to trade BMX serial number should be letters serial numbers because GT.
3. If there's a C above the serial number on your Mongoose, the bicycle was probably made in early 1976. Look for a letter and number in addition to the C above the five-digit serial numbers. In May 1976, BMX Products began including a letter and a number with the C.

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Interpreting the Serial numbers and features

on BMX Products, Inc. Frames

Identifying the serial numbers on the early Mongoose frames is actually quite easy and intuitive. For the most part the early Mongoose frames from 1975 and into early 1976 were done with hand stamped 5 digit numbers starting from 10000. For example, a frame from 1975 will have the numbers like 11994.

A feature of an early 1975 frame is the brake tab. The brake tab on these frames is rectangular in shape. Some time late 1975 and onwards it became a single layer of steel, more oval and thinner in shape.

The early 75 coaster brake tab is also thicker and is comprised of two layers of steel welded together

Another feature of an early 1975 frame was the chainstay brace where it connected the seat tube. Note the flared shape of the 75 frame vs the later style (which carried on through all the later years of this frame style) and the extended seat tube.

A further feature was the headtube was offset to extend more to the bottom than it was to the top. It is our guess that it was done this way to allow clearance for the squarer shoulder on Ashtabula forks. This feature carried over for the first few years till the ashtabula forks were replaced with the more rounder style Tange made forks.

In early 1976, the letter C was added to denote Cromo ' During the early production of the Mongoose frames they were made using 1010 steel tubing,when we found problems with the heat from welding and breakage at the weld points they were changed to Chrome Molly tubing. Both frames looked the same but we need some way of determined the difference due to the frames being nickel plated or powder coated paint ,it was impossible to tell the difference in the material for warranty reasons. The letter C was used for chrome molly.' so the serial numbers would look like C17834.

Another feature of an early frame built in 1975 - 1977 was the extra single gusset above the bottom bracket.

In May 1976 the serial number process changed again with the addition of a month code. From here frames were stamped with the letter C for Cromo, a letter for the month, and a number for the year of production. It was around feb/march 77 that the extra single gusset was dropped from the frame.

Of course these are general guidelines in identifying Mongoose frames and there are the anomalies to this process of serial number identification. Need for speed undercover for mac.

The serial numbers were hand stamped on the bottom bracket tubes then packed in (empty beer) boxes waiting to be welded to frame tubes.