because 20's will greatly increase the upsprung weight of the car, thus degrading it's handling ability, as well as the obvious issue with incorrect speedo readings.
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WS Fiesta in Moondust Silver ~ G2 17's (205/40/17), 1700W Sony stereo, SOLD
ZOOM ZOOM: 2009 Mazda 3 MPS (2nd gen) 256bhp through the front wheels... hello torque steer!!! 
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