Next. Merlin mountain bike frame of unknown vintage. The on-line Merlin serial number lists are unclear on this, but this is likely an 89/90 frame. Here’s some basic information on the frame:
Serial number: 1812
Head tube length: 6.5″

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. The dates coded in the serial numbers, or the dates inferred from the numbers, are dates of brazing or dates on which the new frames were stamped with serial numbers. For more information, click here or call Giant Bicycle toll free at (866) 458-2555. Bike Serial Numbers November 30, 2015. Your bike is one-of-a-kind. The serial number will be engraved underneath the bottom bracket shell on the frame. Just flip that bike over and take a peek!

Seat tube: 19″ center to center, 20.5″ center to top and a 27.2 seat post will fit
Top tube: 23″ center to center

Merlin Bicycles Serial Numbers

The frame is designed for a 1″ steerer tube fork and probably rigid. At the time, this frame likely would have come with a Ritchey Logic fork.
The bottom bracket is a non-grease guard style and appears to have new bearings. The axle is roughly 120mm.
Overall condition is pretty good. The decals have pretty much worn off the frame. There is some evidence of chain suck, but no bad gouges. Normal wear and tear. The pictures posted show the condition pretty clearly. This frame is sold as-is with no returns. Please ask questions if you have them or click on the photos for larger resolution pictures with more detail.

Price is $650 + shipping and any applicable sales tax.

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Unlike automobile serial numbers bicycle serial numbersoften tell very little if anything about the year, model, options, or otherinformation. Collectors through the years have assembled lists based on severalsources to include dealer inventory sheets, documentation of original ownerbikes, and observations of many hundreds of bicycles.

Merlin Bicycle Serial Numbers

The following lists are based on various sources and shouldnot be considered the last word but are the most accurate to date. These willbe updated as more information is discovered. Noticeably absent are Shelbyserial numbers as no reliable list exists.

Merlin Bikes Serial Numbers

The best way to identify a bicycle is by looking at the bikeas a whole and examining frame features, paint schemes, and the othercomponents present. Keep in mind that over the course of 70 years many thingsmay have been changed. It is not unusual to find bikes with mismatchedcomponents not only of years but various manufacturers.The following lists are based on various sourcesand should not be considered the last word but are the most accurate to date.