My long-term Aprilia is losing flab faster than a Lap-Band patient! In my last update the RSV4 was just 1 lb. shy of the 459-lb. RSV4 Factory, and now it’s a full 9 lbs. lighter than the upscale model. The majority of that weight reduction was achieved by swapping the R’s cast-aluminum hoops for the Factory’s forged ones. The $2400 price tag is substantial, but so was the weight savings: 11.4 lbs. in total. That’s a big deal any way you slice it, but the fact that this is unsprung, rotating mass means it has a _huge _effect on handling. As an additional benefit, I can keep the original-equipment Metzelers on the cast wheels and swap the entire assemblies instead of changing tires. The brake discs need to be transferred, but that’s still quicker and easier than mounting and balancing buns. A second set of rotors for the track would make things even easier.