Thanks, Tom! I had assumed the ARX derailleurs were factory because this is the second '83 2700 GT Deluxe I've had with them. Derailleur date codes on the example above were both YE, while the example below had YH and YE. Serial number for the one shown here was Y2Mxxxx. Would Blue Line have enough capacity to swing the drivetrain you noted? I can't verify with Velobase offline.
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Last edited by Hudson308; 10-16-19 at 08:08 PM.