I usually ride with friends 5 - 10 years younger and have trouble keeping up. I have a Jamis Endura, a 19# carbon bike with upright geometry with Ultegra components. Rather than buy a lighter bike, I am thinking about a new wheel set to add some speed and help with hills. I currently have Shimano RS30. This entry level wheel set seems to be my weak link. I am running 25mm Gatorskins. Any suggestions would be welcome.