The speed rating on the tires is 91V which i believe is 129mph -139mph. I am thinking if these tires are mounted on a 300e the performance is going to be much better because the 300e is much lighter than the 400e. Also , lately I've noticed these tires are being advertised in ESPN. Hopefully the prices don't go up.

smk_texas
93 400e
99 Mercury Villager Estate