From 16's to 17's. Quick question.
 

I now have 245 50 16's. I'm getting some 275 40 17's tomorrow. Will my speedo and mileage need to be re-calibrated for it to be correct ???

speedo will read just 1% too slow, no calibration necessary what-so-ever

mine didnt see any real change

thats because it's only 1% ! or equivalent to you speedo reading 99mph when you're actually doing 100mph, well within speedo tolerances anyway

I didn't notice much of a change on my 94 when I put the 17s on it

Remember both combos was offered on camaros depends on the package so no. Same ratio