So I've been to a few...I'm not aware of anything in the Inland Empire. Take a trip down to North San Diego to visit Nytro, great shop. Also head up to Santa Monica to visit Triathlon Lab, another good shop. Tri-Zone in Los Alamitos and OneTri in Santa Ana have a good online "store" but their physical shops are very small without much. Don't bother with Performance...it's all road and mountain bike stuff...very little, if anything Tri related. Bike Religion in Newport is a small shop, but nice guys and a fair, but not great selection. Overall, my vote goes to Nytro.