Quote:
Originally Posted by skyking
Thanks for that. I have a question to pose:
I am building a 5th wheel trailer with (2) 2000 pound rated axles, and the common tire size in that situation is ST175/80R-13, with a 24.1" dia. 23.2" loaded height, 1360 LB capacity. I have planned around the ~23.2" loaded height. Other design factors require that I keep the diameter around this value.
I can't find any resistance data on these tires.
The super low crr bridgestone b381's are available in a 185/70R14 with a similar diameter and a 1200 pound capacity.
The trailer's planned load values are closer to 900 pounds per tire, about a 10% cushion below axle rating.
So this tire is slightly wider, but has a lower aspect ratio. Any thoughts? Are trailer tires low crr to begin with?
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You beat me to it.
Let's start a thread on TT tires starting with your post. Sidewall stiffness, alone, makes it worthy of such (not just rolling resistance) in trying to determine best choices.
LT tires are the likely choice I'll make (not ST, appear to be junk tires) with a per wheel weight range of 1,800 - 2,200-lbs depending on the eventual tandem-axle travel trailer bought and outfitted. (A possible tridem would be below 1,700-lbs per wheel at GVWR.)
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