The last shop I worked at was a Commercial Tire here in La Grande, and I left there after being the assistant manager for 3 years. You're on the right track Shack, and Busaandy is pretty spot on with some of his observations too.
Originally Posted by onebadcoastie
So, it's that time where I'm considering tires for my rig. Now, I currently have E rated tires and I know the trucks are supposed to have E rated tires on them but my question's centered around the max allowable load of the tires when compared to the max allowable load of the wheel the tire is on and the affects of towing heavy with them.
So the wheels I'm looking at are the Diamo 17 Karat 17x10 and they're rated at 3,200 lbs. The tires I am looking at are rated at 3,305 lbs at 50 psi but the tires are D rated with an 8-ply sidewall.
First thing's first, as this will help you a lot in tire decisions. The old school way of measuring tire plies was 2 plies for every letter of the alphabet (B=2 ply, C=6, D=8, E=10)...HOWEVER, this no longer applies and hasn't for many years. Because of new technology, tire companies can build a tire with only 6 body plies that will hold the same weight than an old school true 10 ply tire would SO my point in this is that saying an E rated tire is 10 plies and a D is 8 doesn't apply anymore. If you really want to know how many plies there truly are, it's always printed/grooved into the sidewall.
My question is, if the tire is rated higher than the wheel, is there really an issue with the fact that they aren't E rated? I mean I'll be towing a toy hauler that will have a pin weight of 2,000lbs...roughly but nothing extreme. Would I really be playing with fire or do I need to stick with E rated just cause everyone says so? Just curious on everyone's thoughts.
No there shouldn't be an issue that they're not E rated. However, some food for thought if you will; you should really know what is going to be the weight over the rear tires. Especially with the tire being able to hold more than the wheel, now you're playing with cracked/exploded wheel territory.
The biggest reason I ask is this is because if the rating really is that important, then it changes it the type and size of the tire I purchase. Just curious on everyone's input and maybe even Rob (JetJock15) will chime in as he definitely tows heavy and I know he's experienced a cracked rim.
Originally Posted by busaandy
if you bought them from a tire place they have to sell you the same rating as stock otherwise its a huge liability for the place you bought them from.. they could be sued if something ever happen.. i guess its happen before... so they had no questions when we complained after pissing through tires and have a almost blow out
True, but not 100% They have to sell you a tire that will carry the same amount of weight, but it does not have to have the same letter rating. If they sell you a tire that doesn't at least hold the same amount of weight per tire as the stock tire, no matter what rating it has (D or E) they are completely liable if any damage occurs due to the tires being unable to carry the weight the vehicle was designed for.... they have replaced the tires on my truck and 3 of my friends..
Originally Posted by busaandy
ive been told there checking the tires if a crash ever happens and if the tires are not within there weight for the truck they can fight you for insurance money.. not sure how true it is but does make since if your over loaded...
Again, 100% completely true....your insurance company may not cover you because you're using sub-par equipment. They may still cover you, but like he said, it'll be a fight...It's like if you wanted them to pay for a broken window that had been replaced with plastic somewhere along the line.
toyo told me. youll wear tires out a lot faster being "over weight"..
call the tire company and ask them for your best answer..
cclb i think are 11,500
ccsb are 9,999 lol
not sure what the rear weight is..
The tire company I worked for had a few incidents like this when tire salesmen weren't paying attention and sold the customer an underrated tire. It mainly boils down to weight per tire....not necessarily the weight "rating." A 285/70 R 17 tire in an "E" rating will carry more weight than a 265/70 R 17 E rated tire but a 285/70 R 17 "D" rated tire may (depending on tire) carry the same weight as the 265/70 R 17. The letter rating can change with tire size, even if it carries the same weight per tire.
Either way back to your original question....if your "D" rated tires will hold up to 3300lbs, but your wheels only hold up to 3200lbs, then no it doesn't matter that those tires only carry a D rating....however if it were mine, I wouldn't want the wheel to be the weak point...I've seen a couple overloaded wheels come apart before and they do twice the damage that a blown out tire does.