Buying first cycling shoes

I wear Nike LunarEclipse 2, US Size 7 (On the label it says it is size 40 in EU), this shoe has a lot of extra space as when I run/workout/walk, I enjoy the extra space. I've never bought a European shoe in an EU size.
I used a measuring tool to measure my feet and my feet are exactly a US Size 6.5. I'm looking at Giro and Specialized shoes. (More specifically, the Giro Factor and Giro Trans).
I know a cycling shoe should have a tight, snug fit. What EU Shoe size should I be buying? I am exactly a 6.5 US mens. Giro does offer half sizes
I used a measuring tool to measure my feet and my feet are exactly a US Size 6.5. I'm looking at Giro and Specialized shoes. (More specifically, the Giro Factor and Giro Trans).
I know a cycling shoe should have a tight, snug fit. What EU Shoe size should I be buying? I am exactly a 6.5 US mens. Giro does offer half sizes
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You need to try them on or accept that you will have to order and return several (maybe even many) times to get the correct fit.
FWIW I had to go up 2 EU sizes in Giro Factor.
Road - Wilier Izoard Centaur/Cube Agree C62 Disc
Allround - Cotic Solaris