Those are 12.4 x 24 tires on the correct width rims (I think 11 inches wide). When I went to add the ROPS, I noticed spacers that raise the fenders up. I think the spacers were put on because of the oversize tires. There are pictures of the fender spacers in this old thread I posted about the ROPS. http://www.tractorbynet.com/forums/yanmar/75272-rops-ym240-ym2000-pictures.htmltmar04 said:California, what size are the rear tires on your Yanmar? I have YM2500 with 11.2X24 and want to replace with bigger tires. Mine is also 2wd. wonder how big I can go? I know I can go up 1 size to 12.4 X 24, but might like even bigger. thanks so much.