SMART Tire Company is one of the most interesting companies on Season 13 so far 

The Smart Tire Company partners with NASA to create sustainable tires made out of nitinol. 

The rubber tire is old and unreliable technology. Brian Yennie and Earl Cole are using space-age technology to reinvent the wheel 

Aerospace Company NASA  is helping Brian And Earl to Commercialize  the use of technology  for tires

Then Brian and Earl revealed that a set of tires would cost $2,500 to $3,500. The sharks all agreed that this was too costly 

The company has recently introduced a lighter and lower-cost version of the tires pitched on Shark Tank 

Entrepreneur: Brian Yennie and Earl Cole Business: High-performance airless tire Ask: $500,000 for 2.5% equity Result: No deal Shark: None

This was one of the good startup  which went uninvested