im not exactly sure as to wat offset to get

im getting the Rota Slipstreams for my integra gsr.. 16" 4x100. .. i was thinking +40mm but not sure.. can anyone help me confirm this thx

 

with 40 you will need to roll your fender lip.....depending on of course how low your car is. With 45 you will have no clearance issues at all...so 45 is best, I like 45 also because you can run wider beefier tires.