Well I chose the 50s because I didn't want to have smaller diameter tires than what I had on the 15 inch wheels and I also wanted them to be as wide as possible while keeping the diameter close. My 295/50/15s were about 26.6 inches tall and the 245/60/15 were about 26.5 inches tall.
The 275/50/17 are 27.8 inches tall and the 255/50/17 are 27.0 inches tall. So in reality the Falkens sit my car about 0.5 inch higher in the rear and about 0.25 inch higher in the front and my speedo didn't require any change. My headers thank me also.
Your 275/40/17s are about 25.6 inches tall.