I have the new Boyd 44 carbon clinchers. I cant say enough about them...stiff, light and ride very nice. They are also a very good lookin wheel. I highly recommend based on my experiences with Boyd wheels. I have the aluminum vitesses on my Tarmac that i use for canyon runs. Had over a year on back roads and riding up canyons...still true and are great...stiff and light for aluminum wheels. Also Boyd and his wife are great to work with.