What is Miata Challenge? Miata Challenge is a simple and fun Time Trial series held exclusively at Speed Ventures events. Any Miata can participate. There are four classes for different levels of modifications. See the rules page for more details. Standard HPDE safety equipment is all that is required; 4 pt roll bar on 90-05, Snell SA2005 or newer approved helmet and basic tech inspection. When and where is the next event?