Hmm ... Yuba? Step thru... Bike Friday? Step thru. Benno Carry on? Step thru. Most all dedicated utility/cargo bikes I see are either step thru or "female" mountain bike styled sloped top tube...and for good reason. Speaking of non bakfeits of course. Now we have game changer bikes like Circe Morpheus.... But even the city and rail friendly Orbea Katu has a step thru.