I´m 5´10" 149lbs and bought a Spidi R2 kangaroo ventilated suit in size 50, but that was after trying some other Spidi models on. The R2 was not in stock at the dealer i bought it from, but I just tried on a couple of other models and determined my size. I live in Mexico and we do not have local options here. I waited until I had a trip to a major city in USA and did this. Traveled to DC and wound up at:
http://www.battley.com/
in Maryland. It was a long way out, at the end of a subway line, then 15 minute bus ride, 10 minute walk, but it was worth it. There is a guy there, Paris Tato, he's an expert in suits, he can help you. He shipped my suit to Texas once it was available. The fit is perfect! However, I do recommend you try them on first. You now have an excuse for travel!
