This feature carried over for the first few years till the ashtabula forks were replaced with the more rounder style Tange made forks. It is our guess that it was done this way to allow clearance for the squarer shoulder on Ashtabula forks. 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.Ī further feature was the headtube was offset to extend more to the bottom than it was to the top. The early 75 coaster brake tab is also thicker and is comprised of two layers of steel welded togetherĪnother feature of an early 1975 frame was the chainstay brace where it connected the seat tube. Some time late 1975 and onwards it became a single layer of steel, more oval and thinner in shape. The brake tab on these frames is rectangular in shape. For example, a frame from 1975 will have the numbers like 11994.Ī feature of an early 1975 frame is the brake tab. 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. Identifying the serial numbers on the early Mongoose frames is actually quite easy and intuitive. Interpreting the Serial numbers and features on BMX Products, Inc. If you are still unable to resolve the issue, please contact us directly: ONLINE You can reach the Mongoose customer support team via email at or you can direct message us on any of our social media pages: F. Please browse our FAQs page for a comprehensive list of frequently asked questions.
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