I love these things, but there's a catch: you can't guess every one of them in the exact same environment. In other words, two are 20psi, one is 19psi, and one is 21psi. It's almost impossible to get them exactly the same. However, I found a way around this by deflating each tire individually with the same tire so they all have the same pressure.
π Enhanced Traction Goodyear Wrangler DuraTrac 265/65R17 All-Season Radial Tire - 112S
28 Review
Hankook Ventus V12 evo 2 Summer Radial Tire Review: 255/40R19 93Y
50 Review
Nexen Roadian All Season Radial 30R22XL
18 Review
All-season Goodyear Vector 4Seasons Gen-2 Tires 195/65 R15 91H
15 Review