Hey all. My kid wants to try cross this year. (Yah!) He has an old Orbea road bike with 24" (507) rims and plenty of frame and brake clearance to fit a 28 or maybe even 30mm tire. I can not find ANY cross tire to save my life for the 507 bead size. And there is only one that I can find for a 520 bead - the Intense Micro Knobby 24"x1" or 1-1/8". I would consider getting different rims but I can only find BMX (single speed) rims. This is crazy. What can I do?