I ride a 06 Masi Gran corsa (mostly factory specs.). I've been back at it after losing 80 pounds, riding 150+ miles/ week. I ride quite a bit, but don't have a lot of tech knowledge. My problem, that I hope someone can help with, is that even on long rides for me (40+ mi) I feel like when I'm in my hardest gears I'm pushing to the point where I'm just spinning. of course this is not an issue long term and in the climbs, but I feel like i need harder gears to get a little more resistance when i'm peddaling. What are your thoughts? equipment? something I'm doing wrong? Thanks for the feedback. I just want to get better.