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The 996 Cab with standard US suspension has significant understeer with stock front-rear wheel/tire width staggers. Increasing the stagger will only exacerbate the annoying understeer. I would go with the widest front tire for the matching front rim (8.5Jx18) of the set, and the narrowest rear tire to minimize the understeer designed into the factory US suspension (or upgraded suspension for that matter). So, my question would be what is the max tire size that the 8.5Jx18 will accomodate on a 996 narrow body, and then use the 295/30 on the 11Jx18.