My practice is this... stock up on rear belts. When replacing a new rear belt (and 18T pulley), set the tension TWO notches looser than what the sheets in the package tell you. After about two race days (6 5-minute runs or so), I tighten or set the tension ONE notch looser than what the sheets in the package tell you (in other words, tighten the belt ONE notch from the setting when the belts were new).
This gives the belts more life (roughly 25-30 5-minute runs). This is for my a Novak 6.5 Light powered 501X raced on high-traction indoor dirt. I now have a 7.5 Light in mine, so belt life may increase even more.
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Tamiya America - Trakpower - 92Zero Designs
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