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you dont need to run 18/19 combo if you dont want. I have had CCWs in all of the following:
race - 17 all around 295 front 315 street
Race - 17 all around 315 square
Street - 18 all around 295 front 315 rear
Street - 19 all around 285 front 315 rear
Street - 18 all around 275 front 315 rear
for the street I would not go above 275 front because they start to track in the truck groves outside of that you have many options.