I'd like to know for sure. I'm trying to decide what inner barrels I need to change to for 275-17s on my 17x 11.5 Classics. They work perfectly for 315s, but I'm not sure I can get the beads to set on the narrow ones. I'm thinking either 9.0 or 9.5 + my 1.5" fronts.
And the outer lip measurement is not the same as the bead shoulder clear distance.
I'd have to ask CCW where they pull their measurements from. These wheels came with the car (luckily they are what I would have purchased), my measurement of the front was pulled with rudimentary outside to outside.
I measured my 11.5 x 17 classics. 11.5" clear face of bead shoulders, just a hair under 13.0 lip to lip outside. There's the easy way to measure them, then there's the Accurate Way to measure them.
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