Both of those tire sizes are to wide for the rims that you have. Most tires like to run with the section width close to the rim width. 265 mm = 10.4" which would require about a 9" wheel as a 9" wheel will actually measure approximately 10" on the outside dimension.
In those sizes TireRack only lists 2 tires worth putting on a car and those are the KDW and the Continental Extreme Contact DW.
With the wheels sizes you listed I would look at a 235/275 combination in either 40/35 or 45/40 aspect ratios respectively. That really depends on the car but I would lean towards the taller tires.
So that leaves you with 235/45-18 and 275/40-18 for sizes, now you have to find out who makes them. Again, I like tire rack for this, as I can punch in sizes and see what comes back. In those sizes the only notable tire is the BFG Comp 2.....not bad. Tire rack does not carry the Falken or Nitto lines so you may want to check their websites for those sizes under the 615 (Falken)or NT05 (nitto)
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Donny
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