The chassis of the buggy varies in size and shape depending on the manufacturer, but as a general rule of thumb, a shorter chassis is used on tighter tracks and longer chassis used on bigger tracks.
You may shorten or lengthen the distance between the wheels with the spacers included with your kit. Otherwise it is an expensive visit to your local model shop for an upgrade.
For the majority of racers, the chassis that comes with the kit will be absolutely fine for most tracks.
