chevy venture tire sizes

tirerack.com

They will fit the rim but they are smaller.

205 first number is width.. 205mm wide. or 8.07" 70 second number is the tire sidewall height. It is a percentage of the width. 70% of 205mm = 143.5mm or 5.65" rim to tread. 5.65 X 2 + 15 = 26.3" tall Your original tire is 26.85" tall.

The new tire is about 1/2" shorter & 3/8" narrower than your original. The speedo will be fast by about 2%.

Try this

I have the olds van version and if were not aware, tires make a huge difference in feel and handling. I drove a pontiac who's owner put on what appeared to be smaller & 4 for $100 type tires and the thing was horrible! Even at 35 it seemed to go all over the road. In contrast my '98 Olds has 16" michelins and for a van, it feels "sporty" and will go around turns faster than the occupants typically want to go. Don't chintz in other words.