right i got a flat the other day so ive put on the spare, but its a 16" and the rest are 18s although with the low profile tyres the difference isnt that great, but ive noticed now that when i start to drive my car for about the first 30secs the wee traction control orange triangle flashes and the car holds back, but then it passes and drives normally until next time i go to take it out for a drive, so is the 2 different wheel sizes giving my ecu wonkey readings at start up or whats going on