Analysis of information sources in references of the Wikipedia article "Buell Motorcycle Company" in English language version.
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(help)ZTL has less unsprung weight, and the reduction in wheel weight is mostly near the hub. Some heat will be transferred to the rim and tire through the fasteners, which might be a negative factor in racing applications. However, the rotating mass/inertia of the large-diameter ZTL disc and its fasteners are a negative factor. You'd have to do the math to get an exact rotational comparison with two discs, but that one big disc certainly isn't a large improvement. [...] A ZTL caliper of equivalent rigidity will be heavier than a conventional caliper, but lighter than two. [...] With the ZTL system, one fork leg takes all the braking force.
ZTL has less unsprung weight: This is critically important in a performance motorcycle because minimizing it results in better suspension control and enhanced traction. ZTL is 30 percent lighter than the system on a Suzuki GSX-R1000!