riding mower tire questions

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i have a murray 12.5hp riding lawnmower running that sat in the woods for like the last 2 years.
Tires on it are basically shot. They are carlisle, fronts are 15x6-6 and rears are 18x8.5-8.

one rear has a big dry-rot crack in the sidewall about 4 inches long. I used a $5 can of fix-a-flat and slowed the leak quite a bit, the tire will be usable for about 6 hours after which it's down to < 5 psi and too soft.

I see this green slime stuff alongside just about every lawn & garden tire, what's the deal with this stuff? Are these type of tires so prone to leaking (or puncture?) that you need to pump this slime stuff into it? For my kind of tire problem, is it worth sliming the tire to try to make it hold air? Or is the sidewall crack going to be too much of a structural problem? I'm looking at around $60 a replacement rear tire from tractor supply locally or by mail order.


For a rear tire size now of 18x8.5-8, will a 18x9.5-8 tire fit on that rim? Or what sizes would fit on my rear rims now? Could a 20x10-8 fit?
My purpose for this thing is to tow my 10' raft on a small trailer up my back yard on the river bank, so I need max traction from the rear wheels, and some of the tread designs that i think would be better than the turf tread are a different size than specifically 18x8.5-8.

also, what's the deal with fluid filled tires? or ballast rimguard tires? how can this help with traction?
 
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These tires are very prone to cracking and dry rotting. Slime is just about a necessity for them, wheel barrows, garden trailers etc etc. It should seal the sidewall cracks for you. You can also have tubes put in them and forget the slime.

As for the tire size, not sure about the fit, but since they are both 18" wide, it might work.

The fluid fill is for extra weight to give it more traction, especially during snow removal or moving dirt piles with a blade or front end loader.
 
I have used the Slime on riding mower tires and it works wonders.You may have to use it once a year but it works.
 
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