CapriRacer wrote:
Atlee wrote:
From reading this long thread, I get the idea that many folks want to go to a larger size TT tire because they are on the ragged edge between the weight of their loaded TT and the factory supplied ST tires. There is little margin for error. Is this correct?
Now to my situation. I just bought a used HiLo TT. The GVWR is 5,500#. The GAWR is 3,500# each, totaling 7,000#. The ST205/75R15 LRC Goodyear Marathon tires have a weight rating of 1,820# per tire at 50psi, totaling 7,280#.
Given these numbers, I presume "margin of error" isn't something I need to worry about, WRT the axles and tires. Am I correct?
Interesting side note. They are factory supplied tires. The 2 on the left side are USA Marathons built in 4408. The 2 on the right, plus the spare, are Chinese Marathons built in weeks 08,09, & 10 of 2008.
Let's follow what my web page says:
Barry's Tire Tech - ST Tires
First, it sounds like you haven't weighed your trailer - only quoted what is written on the certification label. If that is so.....
Then your 3500# GAWR (1750# per tire)has to be re-evaluated as 2013#. You'll want tires that are loaded to 85% of their rated load = 2013#/0.85 = 2367#.
So, No!, the tires are not according to my recommendations - and it looks like a simple one step up to a Load Range D isn't enough. This looks like a double step to ST225/75R16 Load Range D.
Barry -- check your numbers. This poster has two axles that combined are rated at 7000 pounds yet the GVWR is 5500 pounds. Assuming a minimum of 10% tongue weight, the maximum weight on the axles will be 5000 pounds. That is 1250 per tire. His tires are rated at 1820 each. So as long as he does not exceed his GVWR, he has a 33% margin on his tires.
