20" Zas LE frame

Isn't that an 18", it doesn't have the extra gusset on the downtube.
It might be the angle of the pic and they've measured to top of seattube.
 
correct, not a 20" frame as according to GT. does look to be 18, folks measure them to the top of collar or top side of top tube and 'call' it 20
 
Possibly a 19'. Third triangle is larger than in 18' while headtube remains the same. Fairly rare size and fit best for me.
 
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