Now that is the question... Lo pro sizing is notoriously tricky but as I understand it the generally approved school of thought is a correctly sized lo pro should mirror the position when in the drops of your road bike.
I've always thought a lo pro should have roughly the same top tube length (horizontally) as your road bike or slightly shorter to hopefully achieve the above, avoiding the faux pro situation. #pubbikefitting
Now that is the question... Lo pro sizing is notoriously tricky but as I understand it the generally approved school of thought is a correctly sized lo pro should mirror the position when in the drops of your road bike.
I've always thought a lo pro should have roughly the same top tube length (horizontally) as your road bike or slightly shorter to hopefully achieve the above, avoiding the faux pro situation. #pubbikefitting