3T, e.g., measures c-to-c on the hoods. Deda, I think, measures outside-to-outside, but I can't remember whether that's in the drops or the hoods...
This seems to fit with my measuring. And yes, some sellers don't even tell you which doesn't help. Decent manufacturer websites always help but I'm currently looking at Nitto M109AA's and I know that Nitto don't even list them on their website...
One of my pet peeves: manufacturers who can't even be arsed to just have a little archive section on their website that lists the specs of stuff they've made previously.
This seems to fit with my measuring. And yes, some sellers don't even tell you which doesn't help. Decent manufacturer websites always help but I'm currently looking at Nitto M109AA's and I know that Nitto don't even list them on their website...