My wife has a 4900 WSD I bought as a gift for her. The WSD has smaller brake levers with less reach for smaller hands. The seat is wider and shorter the typical shape for women then. The frame sizes available were smaller. I have not looked at the geometry tables but think the top tubes may be shorter. The theory was women had shorter torsos then men. It’s a good bike. My shorter friends ask if they they buy it. It’s my wife’s Girl Bike as she calls it. It maybe gets ridden 20 miles a year. She’s into horses. Anyway it’s is all original down to the tires and tubes. If I sold it she would be pissed.