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Old 03-21-2015, 03:26 PM   #15
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Twenty inch wheels themselves are rated for lower weights because of their construction inmost cases. Lower psi air pressure. Jim
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Old 03-21-2015, 03:27 PM   #16
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Twenty inch wheels themselves are rated for lower weights because of their construction inmost cases. Lower psi air pressure. Jim
Really Jim? Where did you find this information, can you please share your source material from a manufacture?

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It clearly shows the increased towing capacity of my truck with 17" wheels rather than my 20''.
The 17 inch tires have a higher load rating and are LT as opposed to the P tires on the 20's.

Go to a cat scale. Airstream has a sticker inside that tells you the weight of the trailer minus propane and things. You can figure out your load for yourself. We have 3.92 and stated tow of 10K but a 2010 Laramie. I just realized you have the lower gears, and that is part of the problem.

But really, our's didn't way close to 6K when we bought it. I'm curious to see where it will be when we hit the scales again fully loaded the way we intended to travel.
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Old 03-21-2015, 03:37 PM   #17
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No. Jim
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Old 03-21-2015, 04:26 PM   #18
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I've never seen wheels that didn't have greater capacity than the tires you could buy to put on them.
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Old 03-21-2015, 07:02 PM   #19
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Quote:
Originally Posted by zigzagguzzi View Post
Twenty inch wheels themselves are rated for lower weights because of their construction inmost cases. Lower psi air pressure. Jim
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Originally Posted by BoldAdventure View Post
Really Jim? Where did you find this information, can you please share your source material from a manufacture?
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No. Jim
Lol!

Jim, I'm sure you were trying to help, but did you think about that before you typed it?

I do believe there are hundreds of thousands of tractor trailers on the road today with big ol' 22.5' and 24.5" wheels. Yes, 7,400b capacity.



Now, back to the OP's question
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Old 03-21-2015, 07:28 PM   #20
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Well, after thinking about it, and your comments, I have just about made up my mind. My truck is an '09 but is in good condition and only has 46,000 miles on it. I can't really afford to get a bigger truck anyway. So I'm going to get smaller wheels and tires to increase my GCWR from 12,000 lb to 13,000 and max trailer from 6,400 to 7,450 lbs.

Any additional comments are of course welcome and appreciated.
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Old 03-21-2015, 09:07 PM   #21
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Whatever makes you feel the safest and most comfortable.
However, you have basically the same truck as BoldAdventure and I do. A few differences, but not huge differences and mine is rated to tow 8,700lbs. If I had a Hemi, My tow rating would be over 10,000lbs. I have 20" wheels and GoodYear Wrangler SRA P275/60/20 tires. The 20" wheels and tires are not the issue.
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Old 03-21-2015, 09:35 PM   #22
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I will weight in on this. I have a 2014 Ram 1500 with Hemi but before that I had a 2005 Ram with a Hemi. The 2005 had 20" wheels when I bought it and kept them until I needed new tires then changed to 17" wheels. I have a 79 31' excella GVW 8550. While the 20" pulled ok after changing to 17" wheels it seemed to not struggle as much up hills and even increased my gas millage while towing by about .5 mpg. I was pleased enough that when I purchased the 2014 I had the dealer change the wheels to 17" YMMV.
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Old 03-21-2015, 10:27 PM   #23
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The smaller 17" wheels/tires will behave similarly to dropping down a gear....they will pull better than the 20's. Ram tells it like it is... :wink:
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Old 03-21-2015, 11:09 PM   #24
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I think we may be saying 'similar' things... The 20's vs the 17's will change the gearing ratio...right? So..Ram says.. the 17's let you 'tow' more... not 'carry' more... big difference.. as Gahorn said above.
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Old 03-22-2015, 08:17 AM   #25
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It's because of the decrease in rotational mass. The 17's won't handle the same as the 20's but you're probably already not taking tight turns fast in a truck anyways.
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Old 03-22-2015, 08:56 AM   #26
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The final gear ratio will not change with a tire and wheel change unless the overall diameter, or really more important, the circumference of the tire changes. Has to do with revolutions per mile.

So, what I'm saying is, if you have a 30" diameter 20" tire, a 30" diameter 17" tire will result in the same final gear ratio. However, weight capacity may go up....depends on the two tires.
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Old 03-22-2015, 09:25 AM   #27
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This is for a 2014 RAM 1500, but I'm pretty sure that 2009 is very similar.
20" wheels come with P275/60/20 tires that are 33"
17" wheels come with P or LT 265/70/17 tires that are 31.7"

It is a change in effective gear ratio, but not very much. Maybe 150 RPM at 60 MPH.
The LT245/70/17 would give the lowest effective gear ratio with about a 200RPM at 60MPH.

The following are tire sizes that are pre-programed in the PCM for speedo calibration-

235/80/17 31.8"
245/70/17 30.6"
265/70/17 31.7"
275/60/20 33"
285/45/22 32"
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Old 03-22-2015, 09:56 AM   #28
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This is for a 2014 RAM 1500, but I'm pretty sure that 2009 is very similar.
20" wheels come with P275/60/20 tires that are 33"
17" wheels come with P or LT 265/70/17 tires that are 31.7"

It is a change in effective gear ratio, but not very much. Maybe 150 RPM at 60 MPH.
The LT245/70/17 would give the lowest effective gear ratio with about a 200RPM at 60MPH.

The following are tire sizes that are pre-programed in the PCM for speedo calibration-

235/80/17 31.8"
245/70/17 30.6"
265/70/17 31.7"
275/60/20 33"
285/45/22 32"
Do you mean the tire size is user adjustable in the truck's heads up computer display? That would be nice.
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