ROP--
In stock sizes,The Luna and the D'Fly are more alike in construction technique and the tetra is somewhat different.All 3 use the same rear triangle,but the main triangle tubesets vary. The Luna and D'Fly use an aluminum BB shell,and the headtube is al.The tetra uses Ti in the BB shell,and the headrube may be ti or Al,depending on size.
Things change when you go custom on a D'Fly-joints amy be lugged,or hand wrapped,depending on angles.
I would suggest you order a frame,rather than buy off the peg.The order form has a place for rider weight,and they consider this when choosing the tubeset.Also,short of full custom,you can get head-seat tube extensions,decal choices,color,and some other things,such as requesting the stiffest possible BB.
The Luna is not a "worse" bike.The price and shorter history result in the shorter warranty,which protects Calfee somewhat.Theoretically,the Luna has the most vihration damping ride,but most say they can tell no difference from the Tetra.
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