Joined: Feb 2012
Posts: 19,379
Likes: 5,524
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
I wouldn't be too worried about the vertical size, it looks like you have long legs for your height anyway. But I would be concerned about the reach/top tube length, especially if you have a short torso for your height.
Also I wouldn't have catorgized the 520 as a performance gravel bike although it will work well enough. Andy