New to the site and just bought my first tri bike. I wanted to get everyone's thoughts of me wanting to go a size down. I recently bought a Trek Speed Concept. It is a size small. I typically ride a XS Giant TCR. The guy at the shop who fitted me stated that my fit was good; however, he wanted to focus on comfort not aero. The fit does feel comfortable but I am more aero or lower on my road by in the drops. I wanted to get an XS with 650 wheels. I am 5'2" with a 28.5" inseam. I read several articles and posts on this site regarding fit but still need a little help. What are you guys' thoughts and check out the seat post or lack there of on my SC. Any help is greatly appreciated.