No sign of an oval. No visible lugs at the bottom bracket, just weld.

I have been using this nexus wheel four 4 years and I love it. I have a two year old alfine 8-speed on my Cannondale. I also have an old Bottechia with a Sturmey Archer 3-speed. The 3 speeds are not close enough together to cope with the Florida head winds and not far enough apart for the Maine hills. So I built the 8-speeds. I use gears 5,6,7 in Florida and all 8 in Maine. My Raleigh Folder with its 3-speed is also a real nice ride. (It called itself a Folder, I suppose that predates the word Twenty.) The only derailleur bike I have is the Trek XO1 which I do not ride. Used to use it on the dirt forest roads in Central Pennsylvania.