Hello saswad welcome to the forums
is it a Triomphe or G.S. RD? I don't have any reference material with me. off to velobase. the brakes say GS. nice looking ride but not the most sought out frame material or components. I kind of agree with Jim
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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