Tried .5 down on the Fire Red 3's and I hate myself for doing so.
I can wear them but not for long. My pore pinky toes start hurting.
I think there is some confusion when people say a shoe runs big and should go a half size down.
My foot measures 8.5 on the scale, and the III's and VI's fit perfect in that size.
Most shoes from Nike and JB, I wear a 9 in, like the 1, nike free. Free Run 2's and 3's Im a 9.5.
There are a lot of older shoes from before 2010 that I wore a 9.5 in, like AM 90's, 95's, 99 IV's, and 99 V's etc.
If I bought shoes in a 9 Im fine, because that's what fits the majority of the time, but never would I say those shoes are tts. But its easy for people in this same scenario to say they run bigger and need to go half size down if they are used to wearing a 9 all the time.
In conclusion, its doesn't feel correct to ever say "a nike/jb shoe runs large, you should go half size down from your TTS". Always get your TTS, Ive never owned Nike/JB Shoe where TTS was too big.