I checked tire pressures on my, new to me, Jubilee. I found the front tires have over 60 lbs pressure in them. The tires are labeled as 6.50-16 6 ply. The manual I have does not show that size tire in the recommended pressures chart. The closest the chart comes to my tires is 6.00-16 6ply. The chart recommends pressures from 20lbs to 44lbs depending on the load per wheel. My thought was to lower the pressure to 40lbs to be under the max recommendation. Does this sound right? Thanks for any input.