I was on a paved road when I did my runs with my GPS and let it go and go and go. Not so bad getting to low 80s with the 13T, but mid 80s with the 14T took a lot of road.Idk how u guys are hitting mid 80's stock. Mine topped out at 78 when it was new stock. With big 3 I still only hit 81 with wind at my back. All on 14 tooth. This was with both my vapor and gps.