Re: need tires for my 60" deck...any thoughts?
Well I just went on the GRAVELY parts radar and solved the mystery.
Up until 1988, pneumatic tires, starting in 1988 at least four different 60" deck model numbers, 45790, 49376, 887003, 887004 all show solid tires, part #045205
THEN, starting with 887024 and then 887031, the two newest model numbers listed, they go back to pneumatic tires. So without an IPL, we have no date on the change back to pneumatic tires, but it was near the end, which matches what you say about your deck.