Traxxas 7772X Maxx AT Tires & Chrome Wheels (2) E-Maxx Parts and the pre-mounted option means

and the pre-mounted option means they are ready to install when you pull the tires out of the package

Spline: 25T (this a standard 25T)

Result: 2nd

It is designated for use with KE25SP2

Traxxas 7772X Maxx AT Tires & Chrome Wheels (2) E-Maxx Parts and the pre-mounted option meansAssembled and glued Maxx AT tires mounted on chrome X Maxx wheels, ready to bolt straight onto your truck. Each package contains one left and one right assembly, complete with foam inserts already installed. Mounting and gluing 8 inch monster truck tires is one of the more tedious jobs in the hobby getting an even bead all the way around a tire this size takes patience and a lot of CA glue. These come factory assembled and glued, so you skip that