The overall dimensions as re exactly the same
you just get the tire ,not the rim , when you buy a rim it should come with new clips and bearings , some don't so read the description close
Tire Diameter, 15.8". Tire Width, 5.9". Rim Diameter, 8". Load Capacity, 500 lbs.16X6.50-8 rim lawn and garden
sometimes you can buy the rim and tire already together, check you axle size by your owner's manual .
16X6.50-8 rim ,with 5/8 axle some older mowers have a bigger axle but most are 5/8
most rims have one on inside on the rim ,but it good to pack the axle and grease cap with grease
your tire will tell you what the size of tire you need for your rim
5/8 axle for the rim