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GT help

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fouronethreeoh!:
Top tube length of expert frame from centre of seat tube to centre head tube is 17 inches.
Below is a 1983 made expert.
There is a no.2 stamped on the r/h rear dropout, which designates expert.
The pro has a no.4 stamp, top tube length of the pro is 18.5 inches, i think, i dont have one to measure.

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