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Old 06-23-2015, 08:04 AM   #1
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Truck tires...20" or 17", E rated?

I have a 2005 Dodge Ram, quad cab with the 5.7, geared 3.92. It has the factory 20” rims & tires. I will most likely be purchasing tires before next camping season. Several other camping friends have went with “E” rated tires for their trucks pulling their campers. I am considering doing the same. I am well within the Ram’s tow rating with my #4100 pound camper even when I include all the “stuff” loaded. I am mainly considering it for peace of mind more than anything.
One thing that has come up in discussion is the 20” vs 17” tires. The Ram’s had both options for my model year (and many other years). Most say that the 17” with E rated tires are a much better towing option than the 20” E rated. I have found several sets of OEM Dodge 17” rims on Craigslist, but I am not sure about making the switch. If I would do so, I would go with a taller 17” tire to get it close to being the same overall diameter of the 20”. That should keep my speedometer close also. Of course the 17” tires have a wider selection and cheaper price. I’m not going to say price is no factor, but, The tires should last me for quite a while. The truck is not a daily driver and only has about 45,000 miles on it. Kept in the garage, so I have had no issues with dry rot on the current tires either.
For anyone with experience, I guess I have 2 questions after that long rant:

1 – Would the E rated tires just be overkill for a truck pulling a lighter weight camper like mine?

2 – Anyone else ever switched from a 20” to 17” (or 18” etc) and noticed a difference at all?


Thanks
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Old 06-23-2015, 08:07 AM   #2
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I ran e 20 inch tires on my F 150 Ecoboost. No advantage in weight carrying capacity as the truck is maxed out anyways with stock P series. I did not want to pay for another set of rims.
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Old 06-23-2015, 10:05 PM   #3
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I actually looked at the same thing as I have 20" wheels on my RAM... The 20's have a slightly better (higher) rating but I don't the night it matters too much as long as it "E" rated LT tire. Personally I wouldn't get new wheels. Look on tire rack.com. For the 20" tires I really like the Michelin LTX AT2 in the LT type tires, but that my opinion...
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Old 06-23-2015, 10:12 PM   #4
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Quote:
Originally Posted by dsjohns71 View Post
I actually looked at the same thing as I have 20" wheels on my RAM... The 20's have a slightly better (higher) rating but I don't the night it matters too much as long as it "E" rated LT tire. Personally I wouldn't get new wheels. Look on tire rack.com. For the 20" tires I really like the Michelin LTX AT2 in the LT type tires, but that my opinion...
X2. The AT2 are noisy but great in Snow as well!!
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Old 06-24-2015, 09:13 AM   #5
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Quote:
Originally Posted by howie70 View Post
I have a 2005 Dodge Ram, quad cab with the 5.7, geared 3.92. It has the factory 20” rims & tires. I will most likely be purchasing tires before next camping season. Several other camping friends have went with “E” rated tires for their trucks pulling their campers. I am considering doing the same. I am well within the Ram’s tow rating with my #4100 pound camper even when I include all the “stuff” loaded. I am mainly considering it for peace of mind more than anything.
One thing that has come up in discussion is the 20” vs 17” tires. The Ram’s had both options for my model year (and many other years). Most say that the 17” with E rated tires are a much better towing option than the 20” E rated. I have found several sets of OEM Dodge 17” rims on Craigslist, but I am not sure about making the switch. If I would do so, I would go with a taller 17” tire to get it close to being the same overall diameter of the 20”. That should keep my speedometer close also. Of course the 17” tires have a wider selection and cheaper price. I’m not going to say price is no factor, but, The tires should last me for quite a while. The truck is not a daily driver and only has about 45,000 miles on it. Kept in the garage, so I have had no issues with dry rot on the current tires either.
For anyone with experience, I guess I have 2 questions after that long rant:

1 – Would the E rated tires just be overkill for a truck pulling a lighter weight camper like mine?

2 – Anyone else ever switched from a 20” to 17” (or 18” etc) and noticed a difference at all?


Thanks
OK you had me confuse at first you stated that you have a 2005 truck but I really think this is a 2015 truck. Correct?

I my self would not buy the 20" tires and wheels for the truck. I know that you have the gasser; but this will should work for you as noted below. I only found one tire size in the LT series such as LT335/60R/20 125R is this the tire that comes on the truck? If so it is rated 3670 LBS @50 PSI.

You can go with 17" 10 ply 126R rated tires such as the Nitto Dural Grappler LT285/70R/17 126 R tires and aftermarket wheels that will support the tire load. The tire is rated for 3750 LBS each at 80 PSI; this is what I am running on my 2008 Ram diesel truck.

Now will your axle support this load, is it the same axle that is put under the diesel trucks? I am not sure.
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Old 06-24-2015, 09:33 AM   #6
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I had the AT2 (e rated) on my previous Dodge, they were a bit noisy and I had a hard time keeping them balanced (a separate problem, no fault of the tire) I liked them and the ride was fine.

I loved the tread wear warranty too!
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Old 06-24-2015, 10:14 AM   #7
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I had 20" tires on my 2013 Chev 1500 and thought about upgraded to "E" tires on it. The diameter is the same as 17"/18" tires but finding 20" E tires was very limited. Is their a reason for this? I think the shorter sidewalls would be stronger.(?) I would check the rims if 80 psi will work.
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Old 06-24-2015, 02:56 PM   #8
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Originally Posted by Jim34RL View Post
OK you had me confuse at first you stated that you have a 2005 truck but I really think this is a 2015 truck. Correct?

I my self would not buy the 20" tires and wheels for the truck. I know that you have the gasser; but this will should work for you as noted below. I only found one tire size in the LT series such as LT335/60R/20 125R is this the tire that comes on the truck? If so it is rated 3670 LBS @50 PSI.

You can go with 17" 10 ply 126R rated tires such as the Nitto Dural Grappler LT285/70R/17 126 R tires and aftermarket wheels that will support the tire load. The tire is rated for 3750 LBS each at 80 PSI; this is what I am running on my 2008 Ram diesel truck.

Now will your axle support this load, is it the same axle that is put under the diesel trucks? I am not sure.
Nope, 2005 is the correct year. It already has 20" tires & wheels, (265/60/20) what I was considering was buying 17" wheels and tires.
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Old 06-24-2015, 04:31 PM   #9
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Just posted this another tire thread as well -, some good info at
http://www.tirerack.com/tires/tirete...jsp?techid=194
Note the following:
P-metric tires used on passenger cars and station wagons are rated to carry 100% of the load indicated on the tire's sidewall (or listed for the tire in industry load/inflation charts). However, if the same P-metric tires are used on light trucks, (pickup trucks and sport utility vehicles for example), their carrying capacity is reduced to 91% of the load indicated on the tire's sidewall. This reduction in load results in causing light truck vehicle manufacturers to select proportionately larger P-metric sized tires for their vehicles to help offset the forces and loads resulting from a light truck's higher center of gravity and increased possibility of being occasionally "overloaded."
.
.
.
For example, P235/75R15 P-metric sized, standard load tires used on cars and light trucks would be rated to carry the following maximum loads at 35 psi:
.
.
CarsFull Value2028 lbs.
.
Light Trucks
9% Reduced Value1845 lbs.
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Old 06-25-2015, 06:59 AM   #10
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I have 20 inch tires on my 2500 HD i chose a set of cooper with a litter more aggressive
tread since i live in Iowa and in the country roads are usually snow or mud this year they are an E rated and there was not much of a choice in the 20 tire with the tread style i was looking for but very happy with them ,got them at discount tire
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