[bl-is-future]

the 2.5 is good for 5s but the 1y is ballistic on 5s. so if you run 4s i would get the 1y. If you run 5s i would still get the 1y but others will say 2.5 cause it will rev lower. Seriously how often are you at full throttle. And these motors max at 60k and the 1y with 5s is no where near that so i say 1y either way.