VO2 Max isn't a particularly good predictor of road cycling race results. Athletes can only sustain their VO2 Max output for about 7 minutes (plus or minus). But stage winners tend to be either sprinters with high anaerobic power output, or climbers who can sustain a high aerobic power-to-weight ratio for much longer than 7 minutes. All pro cyclists have relatively high VO2 Max metrics but this is more incidental rather than something that they specifically train much.