Originally Posted by
merlinextraligh
Moreso for marketing. Also, allegedly, it's cheaper to build a frame with a bonded in CF stays, than it is to weld an aluminum rear end.
These frames came out when CF was just becoming the big deal. I think they're dying out because people are realizing they actually don't make a ton of sense.
Unless it's like my Tricross - carbon stays with Zertz inserts. Zertz makes you go faster, and also makes you more attractive to the ladies. And it makes your breath minty fresh.