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Old 08-15-2013, 08:05 PM   #15
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Location: Sioux Falls, SD
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I have an 08 F350 SRW that the original owner upgraded to 20" over the 18"'s. The radius is the same with lower profile walls. I think it handles better with the 20's because of the amount of sidewall flex.

2014 F350 diesel
2011 Open Range Rolling Thunder H345
2013 BMW 800GS - 2005 BMW 650GS
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Old 08-16-2013, 07:39 PM   #16
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Join Date: Mar 2013
Location: Elizabeth, IN
Posts: 24
I found a set of 17" tires and rims, having them put on Sunday and we'll see what happens.
Thanks for all the input

2002 Keystone Hornet 5th Wheel
2007 Ford F-250 XLT 6.0 Diesel
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Old 08-17-2013, 09:05 PM   #17
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Posts: 1,312
I went 17 to 18 because I gained over 400 lbs per tire. I was on the edge with our 5th wheel pin weight. Difference is 4% in diameter that I programmed with my Hypertech.
Barbara and Laurent, Hartland Big Country 3500RL. 39 ft long and 15500 GVW.
2005 Ford F250 SD, XL F250 4x4, Long Box, 6.0L Diesel, 6 Speed Stick, Hypertech Max Energy for Fuel mileage of 21 MPusG empty, 12.6 MPusG pulling the BC. ScangaugeII for display..
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Old 08-24-2013, 08:28 AM   #18
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Location: Midland County, Texas
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Originally Posted by RLM4x4 View Post
That's why I'm really considering going back to 17" tires . Just having trouble finding some OEM rims
Look for both 17" and 18" rims. 18" rims were standard on some trims, and optional on the ones that had 17" standard. 18" tires are now available at reasonable prices. Be awake because those 18" size tires come in P-series car tires as well as load range C and the required load range E.

LT275/65R18E was std on some SRWs - those have revs/mile of 647. Cost from $179 for Kumho to about $300 for the Wrangler DuraTrac, with most around $225 each. http://www.tirerack.com/tires/tires....=yes&tab=Specs

LT275/70R18E was also std on some trim levels and probably 4x4s - has revs/mile of 628, or about 3% taller than the LT275/65R18E. That slightly taller tire is a tad higher priced than the 65 profile.
Grumpy ole man with over 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 3.5L EcoBoost SuperCrew.
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Old 08-25-2013, 07:51 AM   #19
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Location: Elizabeth, IN
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well I had them put on but I had to have a new rear brake caliper put on and then they replaced the front axle bearings and seals so I haven't pulled the camper yet. I think it drives better. As far as shifting it seems to shift more smoothly. As soon as I pull the camper I'll post how it went.

Thanks for all the post.

2002 Keystone Hornet 5th Wheel
2007 Ford F-250 XLT 6.0 Diesel
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