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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
BFG's recommended rim width range for that tire 6.5 - 8.5. If you are buying aftermarket rims, my opinion would be to go wider so you won't have a problem upgrading to a wider tire later if you choose.
Copy that. Looks like the Soft-8's don't come in a 7.5" width anyway so 8.0" looks like the way to go.