Tire Rating Different On Both Tires

[BornBlue82]

This may be an easy question. So last year I had a tire blow while returning from a lake trip. I bought a new tire the next day (Carlisle 225 75 r15 D rating). I decided to go ahead and replace the other tire this season, since both old tires where put on the same time. So the tire that I purchased this year is the exact same tire but it has an E rating. The D rating pressure is 65 psi and the E rating pressure is 80psi. Will this affect anything? I understand that the walls are thicker on the E rated tire, which is why the pressure is higher. Thanks in advance.

 

[Scott Danforth]

pressure is higher so you can carry more load. hence the thicker sidewalls to contain the pressure. if D rating is what you need, the other being an E wont hurt anything.

if one is load range D and one is load range E, they are not the same tire. maybe both are carlisles, maybe the tread is similar, however that is where the similarity ends. different number of plies, slightly different construction.

 

[BornBlue82]

Right, that's what I was trying to say. My only question is as long as my tires are the same as or above D Rating, I shouldn't have any problems, right?

 

[Scott Danforth]

no problems. inflate them both to the max. running the load range E under inflated will generate more heat.

 

[bruceb58]

You should inflate them both to the same pressure.

 

[phillyg]

I would not run those tires on the same axle without first contacting Carlisle to see if its okay. In my opinion, two tires running different pressure will act differently on the road.

 

[smokeonthewater]

SOOOOOO the answer here is that you need to buy another one of whichever weight rating is appropriate for your boat (weigh it so you know) and then with all three at rated pressure use the odd ball for your spare... done deal

 

[WIMUSKY]

^^^^^^ That's what I would do too. I wouldn't run mismatched tires....... You're going to have 1 tire flexing more than the other while going down the road....

 

[kjsAZ]

Running these two tires on one axle is a simple no-no. Even if you run the E rated tire at the D-pressure or both at their max pressure they will behave completely different.

 

[bruceb58]

yeah, i think I agree with you guys too now.

 

[BornBlue82]

Thanks for the advice, the replies went in both directions. So I guess I will ride like this for a short time and go ahead and order another E rating tire, and use the D rating as a spare.

 

[Gyrene]

Thanks for the advice, the replies went in both directions. So I guess I will ride like this for a short time and go ahead and order another E rating tire, and use the D rating as a spare.

Clearly, that is the safest option.

 

[smokeonthewater]

ONLY do that IF the boat and trailer weigh more than double the rated weight of the lesser tire... If they are at or under double the rating of the lesser tire then buy another of that one.... running heavier tires than you need doesn't do you any favors and beats up your boat and trailer more than necessary

 

[BornBlue82]

Where would I find the recommended tire rating for my boat & trailer?

ONLY do that IF the boat and trailer weigh more than double the rated weight of the lesser tire... If they are at or under double the rating of the lesser tire then buy another of that one.... running heavier tires than you need doesn't do you any favors and beats up your boat and trailer more than necessary

 

[smokeonthewater]

at any major truck stop, garbage dump, scrap yard, co'op, etc... fill the fuel tank and stow gear, cooler, etc, on board as if you were heading out on the water and take the rig to a scale... weigh it .... truck stops generally charge about $10 and other places may do it free or have a charge of some sort....

this is the only way to really know the weight.