Stretch Fit Drive Systems Demand Highly Engineered Solutions.Gates Micro-V Stretch Fit Belts, with exclusive self-tensioning technology, were the first Aftermarket belts engineered to fit like a glove and perform properly on these unique stretch fit drive systems.Patented highly engineered EPDM belt ribs are extremely resistant to oil leaks, wear and pilling.Gates engineered tensile cord has the needed combination of strength and flexibility using advanced polyamide tensile cord.