^^...what badmother said.
I have three different suitcases that I use for my various Bike Fridays: Carlton, Samsonite Oyster and Samsonite F'lite.
The first two are within 62" maximum airline dimensions, the last is slightly over....but that doesn't stop me from flying with it.
Couple things to keep in mind: Never, ever exceed the 50 lb. weight limit if you're using a slightly oversize case. Why? The minute you exceed, the agent will pull out a tape measure, and see if you can be socked for oversize in addition to overweight charges.
I've never flown where they didn't check the weight of my suitcase. But I have flown with the F'lite and they didn't measure size for whatever reason.
I've actually waited for the agent to become busier before approaching. The busier they are, the less likely they are to check size. And I've never been charged oversize on any flight with the F'lite.