Overall diameter of the RSX tire is close to 1" smaller than TSX. You could try to find a compromise somewhere in the middle. 215/35/19 is a common size for the RSX because it is close to stock; if you went to 225/35/19 you'd be like .75" larger than stock-your speedo would be off 2mph at 75,-and that size tire is still too small for the TSX. TSX should be 235/35/19, which is too wide and too tall for RSX.CL9 nyte ryder said:I guess what I'm asking is are both wheel wells similar in size? If one size rim fits the RSX would it be safe to say that it fits the TSX as well?