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I run 9 lbs in them. I do a lot of spraying with it so I like the extra air pressure. I have a 30 gallon tank on my sp500 and when it's full thats a lot of weight on the tires , still has a smooth ride though.
The spring spacers cost like 12 dollars and are worth the money you could probably put them in a grizz i will check this weekend as i now i will have to pull out a 99 600 all day long .