ABOUT STREET TECH FORMULA™ (STF) Street Tech Formula™ (STF) is specifically engineered from top quality components to obtain all the best properties necessary for the ultimate in street wheel performance. BONES® WHEELS has created a wheel with a substantially higher rebound for more speed and amazing slide capabilities while maintaining a resistance to flat spotting well beyond any standard wheel. The technology behind STF is proven. The results speak for themselves. Hype is hype, “quality” is for real. Try Street Tech Formula™ wheels on your next setup and see for yourself.