Ford Mustang Forum banner

aspect ratio

  1. 2005-2010 Mustang GT Tech
    ...Need some assistance from the Brain Trust: Will I need to recalibrate my speedometer if I switch from the stock 17" 2008 GT wheels running P235/55ZR17's all the way around to staggered aftermarket 18" wheels running 285/40ZR18's in the rear & 255/45ZR18's in the front...