1989 Jeep Wrangler YJ Tire Size?

Summer

New member
I am looking at buying a 1989 Jeep YJ.... But it needs all new tires. I found on Craigslist a set of four affordable tires, that say they fit a YJ, however I was online and saw that the size of a YJ tire is very similar to these tires with one difference.

one says 225/ 75/ R15
the other is 225/ 70 / R15

(the ones I plan on buying are the 225/ 70/ R15

I was wondering if this difference between 70 and 75 makes a difference in the tire? and what does that number mean?

Also, I dont plan on going off roading, just driving myself around anywhere I need to go. Just an every day car.

so does it matter?
Please help!
 
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