You would need to call Tire Kingdom
I can't speak for Tire Kingdom but I also have that same size and found some lower treadwear desent brand name tires for about 90. The middle of the line tires I got were around 120 or so. Do yourself a favor, for the money you'll spend for a set of tires, don't buy cheap tires they don't last. This may not be true for all tires out there but I have found you get what you pay for. Spend a little time discussing the tires they reccommend. Never pick a tire because you like the cool tread pattern it has. Looks can be deceiving!
235/55r18 how much
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