i believe the zircon is the replacement for the carbide. i've seen some articles on it over the last couple weeks. other than some cosmetic differences, it's about the same thing.
here is a link to TSC web page on it.
http://www.tractorsupply.com/outdoor...o-kart-1015780
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07 HH250SS
UNI
HIT CLUTCH
DR. PULLEY VARIATOR
RED MAIN
17g ROLLERS
12T/45T SPROCKETS
IRIDIUM PLUG
HP CDI & COIL
LED LIGHTS
ASW CARBIDE
UNI
12g SLIDERS
RED MAIN
39T SPROCKET (coming soon)
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