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Although I run 20s myself, I think for the most part 19s fit better for most applications. With a full body kit though I think 20s fit very well. It also depends on the rim face design. Some rims look smaller than they are, and some look larger. Since I don't have a body kit, I think my 20s are just a tad too large at times, but I got a pretty good deal on them so I'm happy.