Thread: Trek 91x with unreadable serial number
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Old 12-21-20 | 08:44 AM
  #18  
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JohnDThompson
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From: Appleton WI

Bikes: Several, mostly not name brands.

Originally Posted by IsleRide
There might be a year date on one of the head tube lugs.
If there's a number on the lug, it refers to the lug angle, not the date. E.g., here's a Nikko head lug of the type used on the OP's Trek:
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