More fun with tires :-)
Lots of threads in the area, but I thought I would drop another on the pile. I have read a number of them and most have their opinion on brands and type (ie. st versus lt)... but was wondering about ...
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As stated ply rating is not often used. The load rating is the most common. With the used of steel and various plastic compositions it seem the "ply" number were phased out.
My tires are rated C at 50 psi and D at 65 psi. At 50 psi they are rated 140 lbs. more than the 7000 lbs. max axle rating; at 65 psi they are more than 1000 lbs. over the axel rating. However they definitely transfer more shock to the TT at 65 psi.
Since the scales tell me that my 7000 lbs. axle pair are only carrying 5600 lbs. when I am loaded for the road, the C rating would be fine but the D rating was only $20.00 more per tire.
I bought the TT used and put over 15,000 miles in three years on the original C rated tires. I changed them because they were 7 years old. I had the D rated tires two months and hit a road hazard that bent the rim, shredded a tire and broke a spring.
Road hazards have very little respect for tire ratings or price. :)
My tires are rated C at 50 psi and D at 65 psi. At 50 psi they are rated 140 lbs. more than the 7000 lbs. max axle rating; at 65 psi they are more than 1000 lbs. over the axel rating. However they definitely transfer more shock to the TT at 65 psi.
Since the scales tell me that my 7000 lbs. axle pair are only carrying 5600 lbs. when I am loaded for the road, the C rating would be fine but the D rating was only $20.00 more per tire.
I bought the TT used and put over 15,000 miles in three years on the original C rated tires. I changed them because they were 7 years old. I had the D rated tires two months and hit a road hazard that bent the rim, shredded a tire and broke a spring.
Road hazards have very little respect for tire ratings or price. :)
