Amain carriers both the Avid and the Schelle chassis, so it depends on which one you want
There's two different stretch chassis.... theres an Aluminum and Carbon fiber one.
Most of the people that run on med-high bite have been using the Carbon fiber one, and the Aluminum ive seen people run those on astro and high bite clay track.
I have the Schelle Carbon one and it make the car even easier to drive and can push it harder as well. I run both indoor on medium size track and outdoors on a 1/8 size track and the chassis has been great