Recognize that I am nit a ZEN expert, but I think th main difference is based on leg or inseam length. The seat and handlebar locations are tune able. I have bought and built maybe 30 bikes over the years and it seems thatbevery one of them needed tweaking. I am already planning on changing the ZEN when I get it because I tend to measure my rides in hours and 10s of miles and at my age comfort is king.
I finally found a bike that felt just right on a recent test ride, quickly comparing the geometry to the Zen Photon when I got home. The reach was less than a half inch difference, but the handlebars seemed to be higher relative to the seat height compared to all the other bikes I test rode. I noticed when comparing the head tube length, the bike that fit was over 3” longer, 8 7/8” vs Photon’s 5.5”. If the head tube angle was the same on both, would that mean an extra 3” of handlebar height? The other bike had no head tube angle spec, unfortunately.
If the bike thst seemed to fit just right had not been a derailleur drivetrain, I’d have bought it on the spot. I’ll compromise on some things, but not on an internally geared hub with belt drive.
This is the bike that seemed to fit right. It seems a bit overpriced for the spec level, but would overlook that for a good fit if not for the derailleur part.
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Serfas® - eDASH 500W E-Bike - Serfas
Serfas® Dart 500W - Step Over and Step Through Frame - 500W Electric Motor - Samsung® Battery - 30 Mile Range - Class 3 E-Bike
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