Over the 22 years I've had my car and dabbled in research the glass springs don't appear to have little if any popularity in the upper-end hi-performance arena. Simply put - If they were really that good they wouldn't they be more popular?
In general the leaf spring for passenger cars are pretty much a dead design. Another issue is consistency of flex/spring rate, with golf club shafts the early graphite/boron stuff was horribly inconsistent, impossible to exactly duplicate a club due to overall stiffness and flex-point variations. The newer generation golf shafts have narrowed the margin of deviation substantially. You have to ask the question: Are the fiberglass composite leaf manufacturers as sophisticated?
I know you want them, but I just don't perceive them as the better choice in todays market.
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