Speedometer off?

[Msp090697@domain.elided]

This may be a silly question but here it goes.......
I want to put 15" rims on my '85 Spider Graduate.  my question is what will 
this do to the accuracy of my speedometer.  does anyone know the proper 15" 
tires that will match height with the 14" stock tires to prevent any 
inaccuracies.  do i need to lower the suspension stop to prevent bottoming 
the car on the tire?   is there any info from someone who has done this that 
i did not mention?  this is my first Alfa.

Mark
'85 Spider Graduate
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