Baby Trend Rocket Stroller Princeton Replacement rear wheel. Condition is "Used". This is the wheel only, not the stroller, the stroller is shown for reference only and it's not included. #100521, this number is not the model number it's just for my inventory. Model number is shown in the last 2 pictures. Size is 5 3/8" in diameter and leg hole is octogon shape and is 7/8". Flaws, has some rust on the metal bar piece, see pics 2, 4 and 5 for details.