One of the problems with motorcycle rims and tires on a bicycle is Rotational mass. Another is unsprung mass. Basically, the more mass you have, the harder it is to change it's speed and direction. This science behind this is is
Moment of inertia. In laymen's terms, a heavy wheel is much harder to spin up, causing slower acceleration. much harder to stop spinning, hurting braking performance, and harder to keep planted to the ground, hurting suspension performance. The difference between a 2 pound wheel and a 10 pound wheel is staggering.
As for Carbon fiber frames, not a good idea. Tensile strength of CF is stronger than steel by weight, but then some forms of glass are also stronger than steel. Would you want a bike frame made of glass? I hate to shatter your ideas, but the idea is just cracked.
There are many different ways to evaluate a building material. raw tensile strength by weight is just one. you also need to know what the torsional rigidity of the material is, what it's fatigue rate is, what it's compressive strength is, and what it's failure mode is.
One of the best built CF bikes I've ever seen was the prototype Phasor Cycle. The guy who's user name I forgot built it as part of a project here a few years back. If you want to dig around for the thread, it's an interesting read. the design and build quality were outstanding. Ultimately, the frame cracked. They developed the idea into a production frame, but it's steel now, and much better.
