You're correct, the tire/wheel size and bolt pattern is identical to the X series. Deere originally said no HDAP ties because of the greater load from the 210FEL but several on here have HDAP's with the FEL with no problems. All the tires are 4 ply so I have to believe the weight ratings are quite similar. I have both bar and turf tires for my 2210 and the difference in traction is quite amazing. Still, a set of HDAP's would be a nice compromise......