Changing Wheel Size - Safe to do? on 2002 Ford Mustang

The wheels and tires I want for my 16" Mustang Wheels can only be found in a 15" version. Can I switch to 15" wheels and tires without throwing off the speedometer or causing damage to any components? (Mustang Premium Convertible V6)

Asked by for the 2002 Ford Mustang
Check out the tire rack web site lots of useful information afterward call their tech people!