Bushhog tire/rim size important

[hotchkiss]

I recently purchased a 10 foot Bushhog brand harrow disc. I believe the model number is 1404, but would not bet much on it. This weekend I noticed that the tread on one of the tires was seperating and intended to look at the tire size before I left the farm. My plan was to pick up the tires and change them when I got there because rain is expected later this week and it will be the first chance I have had to work some ground in the smaller food plots. That is right - you guessed it. I forgot to look at the tire size and need to pick up two tires before I go back later this week.

Does anyone have an idea or best estimate as to what size tire is likely on this implement? Thanks.