I don't know if they screwed up or not, but I bought the right tire size. However, I received an Implement rated 8 PLY US made tire. This far exceeds what my small John Deere F510 front mower requires or was originally supplied with (2 layers). They were a bit difficult to mount without giving in to the profile or sidewall. The key to easily mounting a tire is to use REAL tire soap (heavy soap mix in a bucket - no liquid mud, no dish soap, no aerosol cleaner, no WD40. And clean the rim. If the bead doesn't saddle then, use a ratchet strap around the Circumference of tread tighten and the bead lifts off the rim Apply some more tire soap inside the bead if needed I had to use my skid steer to slide the sidewall over the edge to work the bead around the rim around the tire was a bear.