TrailManor Owner's Forum - View Single Post - Tire brands

Padgett · 08-26-2015, 07:16 PM

Just to expand a little (remember 2 ply - 4 ply rating ? Today that would be LRB (if we had a "B"))
6 ply rating = LRC = 50 psi max
8 ply rating = LRD = 65 psi max
10 ply rating -LRE = 80 psi max

Now the "Load" is a function of the tire volume (205x75) and the pressure. For a given size the higher the pressure the greater the load rating so a LRE tire at 65 psi can carry the same load as a LRD, just the construction should be more robust to carry the higher pressure and is generally more resistant to heat. OTOH a LRD with a nylon overlay is as heat resistant as a LRE without. (frankly for a trailer without shocks IMNSHO anything over 65 psi is going to create a very harsh ride for the innards).

Now I like at least a 25% overdesign for a street tire to account for shocks and "oops" so fo a 3500 lb axle load, that is 1750 lbs per tire x 125%= 2187 so 205x75x15 LRD at 2150 lbs @ 65 psi is good enough for me.

Am I rambling again ?

08-26-2015, 07:16 PM	#20
Padgett TrailManor Master Join Date: Apr 2014 Location: Orlando Posts: 2,796	Just to expand a little (remember 2 ply - 4 ply rating ? Today that would be LRB (if we had a "B")) 6 ply rating = LRC = 50 psi max 8 ply rating = LRD = 65 psi max 10 ply rating -LRE = 80 psi max Now the "Load" is a function of the tire volume (205x75) and the pressure. For a given size the higher the pressure the greater the load rating so a LRE tire at 65 psi can carry the same load as a LRD, just the construction should be more robust to carry the higher pressure and is generally more resistant to heat. OTOH a LRD with a nylon overlay is as heat resistant as a LRE without. (frankly for a trailer without shocks IMNSHO anything over 65 psi is going to create a very harsh ride for the innards). Now I like at least a 25% overdesign for a street tire to account for shocks and "oops" so fo a 3500 lb axle load, that is 1750 lbs per tire x 125%= 2187 so 205x75x15 LRD at 2150 lbs @ 65 psi is good enough for me. Am I rambling again ? __________________ Looking for a 24/17 in or near Florida.