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I am looking at purchasing a used Surly Pacer. However, the owner is unsure of the year (he also bought it used). Are there any visual cues that I can use to identify the year of the frame?

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    @RoboKaren - disagree on marking this duplicate. There is a Surly specific answer here that is more detailed than for a general bike. – Batman Jun 12 '17 at 22:33
  • Sure, I think the flag works well as a comment to help people see the 'reference' question, and I added a link back to your excellent answer from the 'reference' question page. The bigger 'meta' question is whether we want one of these q/a pairs for each manufacturer, or one unified question/answer. – RoboKaren Jun 12 '17 at 22:40
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From Surly themselves: "What year was my frame built?

You know that serial number on the underside of your bottom bracket? No?! Ok, so flip your bike over and take a look closely at the bottom bracket shell (the cylinder at the bottom of the frame around which your crank rotates). There will be a code stamped into the shell starting with the letter "M". Sometimes this stamp has a bunch of paint that has collected in it but look closely, it is there, I promise. The following number after the M signifies the last digit(s) of the production year of your frame. So, for instance, M2598144 was made in 2002, M8128666 was made in 2008 and M10034269 was made in 2010. Now write down the serial number and keep it somewhere you can find it in case your bike gets stolen. This might be the only identifiable mark on your frame if it comes back to you!"

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