Marathon runners are notorious for having a narrow gap. This is from the breaking 2 project. Of course, I don’t know how running speed scales with cycling watts. And LT2 is always a moving target with its myriads of definitions (only 3min steps!!!):
The blood [lactate]-running speed relationship in the incremental treadmill test. A : the individual athlete blood [lactate] profiles along with the mean response (in bold). B : the response of a representative athlete showing the selected values for lactate threshold (LT) and lactate turn-point (LTP). C : the mean ± SD running speed and blood [lactate] at which LT and LTP were identified.