can you post some pics? here in the US the Sport SX ended in '89. the only 105 components I see on a Sport SX are the shifters on a '85 but that came with Suntour derailleurs.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk