Off-diameter tires

[Brooks Ellis <brooks@fortnet.org>]

   Suppose, I was either real crazy, or I smoked a lot of crack one 
weekend, and I decided it was time to put new tires on my car. I thought 
it would be pretty cool if I put some 50-series tires on my '90 100Q, and 
figured I could put them on a '90 200Q when/if I got one. Yeah, sure, 
thats what I'll do allright. Ok, but you see, the tires are 15X6 inchaz, 
and the wheel wells won't fit larger tires, like, at all. Bum-mer. So 
I'll just go ahead and stick 205 vr (sr zr whatever) 50 15 boys on them 
wheels. 
    Would this 'screw things up BADD'? Could I get my spedometer 
recalibrated for the smaller tires for a low cost? would it $#%^ up my 
ABS/whatever else uses tire size to function?

Brooks 'I'm not really crazy or smoking crack, i was just curious. yeah.'