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09-29-2020, 01:07 PM
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#1
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Seasoned Camper
Join Date: Oct 2019
Location: Colorado Springs
Posts: 72
M.O.C. #25159
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Wheel Size For TV 20" vs 18"
Good day Montana owners!
I am about to pull the trigger on buying a 2020/2021 SRW new truck to pull my 3000RK (12,500 GVWR).
I would like to know if it matters which size wheels 20" vs 18" I have when towing. Both sets of wheels have E rated tires and the sidewall profile difference is 5mm (65 vs 70). The big difference is price. The 20" wheels cost $1340 and when I have to replace tires, the 20" tires cost $100 more per tire than the 18".
I would like to get some feedback on my dilemma.
Thanks,
Igoo65
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09-29-2020, 01:18 PM
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#2
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Montana Master
Join Date: Aug 2018
Location: Minden - NV
Posts: 501
M.O.C. #22360
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I think you answered your own question. 20's cost more than 18s both initially and down the road. Other than looks, you can get tires with load ratings up to 4080lbs per tire (LT295 and some LT285s)
FYI, the 65 vs 70 is a percentage, not a 5mm difference.
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2013 F350 Lariat Ultimate CC LB
2019 3790RD
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09-29-2020, 01:19 PM
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#3
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,547
M.O.C. #2283
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Yes it definitely does make a difference. There is less sway in the 20 inch tires. You have an inch less side wall. I have had both. I would bite the bullet and get the 20s.
Lynwood
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09-29-2020, 01:21 PM
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#4
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Montana Master
Join Date: Mar 2020
Location: Lamesa
Posts: 621
M.O.C. #26010
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If you can find the truck you want and get the 18s I'd say go for it. The 18 and 20 inch tires both do the same thing but the 20" wheel pkg. costs up front and tires cost more down the road. The only thing they have going for them is looks in some folks opinion. I've had 20s on the last 3 trucks because the trucks I could find with the equipment I wanted (not 20 inch wheels) all had them.
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Danny and Susan wife of 55 years
2019 Ram Laramie 3500 6.4 4x4 CC 4.10 SRW
2020 Montana High Country 331RL
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10-02-2020, 01:07 PM
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#5
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,690
M.O.C. #12947
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On our 4WD truck, in the manual it said the 20’s were not recommended for off pavement driving. The dealership had put after market 20’s on our truck and it rode harsh. I had them put the 18’s back on before we would purchase it, and the ride was vastly improved.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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10-02-2020, 01:56 PM
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#6
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Montana Fan
Join Date: Dec 2017
Location: Sharpsburg
Posts: 202
M.O.C. #20974
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go with 18"
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2023 GMC 2500 HD AT4
2018 High Country 340BH
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10-02-2020, 07:19 PM
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#7
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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That trailer weight isn't an issue with either size. 18s will have a better ride, lower cost, and after 3 months you won't even know the difference with regards to looks.
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2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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10-02-2020, 08:24 PM
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#8
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,160
M.O.C. #6433
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The same tire in 20” will have a couple hundred pounds heavier load rating per tire than the equivalent tire in 18” if that matters to you. Due to the shorter sidewall I suppose.
I used to have a link to Ford published truck specifications for all the various configurations and options and the F350 with 20” wheels had higher payload ratings than the same F350 with 18” wheels. Can’t find that link now.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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10-04-2020, 05:27 AM
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#9
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,137
M.O.C. #25165
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I don't believe there is a practical use difference between the 18 and 20 inch tires. My F350 SRW has 20 inch tires as part of the package ordered by the dealer before I purchased it. I have noticed that the DRW's have 19.5 inch tires in that same year. I guess some engineer decided that was better ratio for that model truck, but I'm not sure you'll know the difference either way. BTW, Ford put an 18 inch spare under my truck with the 20 inch tires, but it is taller so it will be roughly the same height as the 20's.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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10-07-2020, 03:31 PM
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#10
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Montana Fan
Join Date: Nov 2011
Location: Albany
Posts: 407
M.O.C. #11972
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I can't speak to the newer TVs but when I bought mine, with 20" wheels the GVWR was 10,000 lbs but with 18" wheels the GVWR was 11,500 lbs.
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2012 3150RL. G614 tires. Hardwired surge protector. Level-Up Hydraulic leveling.
2013 F-350 Lariat 6.7 PSD SRW SC LB 4X4 OEM hitch, air self-leveling on rear. 57-gallon replacement fuel tank. DieselSite water separator/fuel filter.
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10-07-2020, 05:09 PM
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#11
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Established Member
Join Date: May 2017
Location: Owego
Posts: 22
M.O.C. #19903
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I had 20" wheels on my 2011 2500HD Duramax. 20" tires are hard to come by out on the road if you need to buy them. 18s are a lot easier to come by
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Mark, Betsy, & the Keeshonden, Zaan & Tori
2019 Chevy 3500HD Duramax LTZ
2014 Montana HC 325RL
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10-07-2020, 06:00 PM
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#12
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,359
M.O.C. #4831
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The 20" tires have a slightly higher carrying capacity compared to the 18" ones. I have never had a problem getting replacements. Discount Tire carries the Michelin's and 20" replacement tires can be found at Costco and Les Schwab. Oh yea, my 2015 F350 with 20" wheels has a GVWR of 11,500.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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10-07-2020, 07:10 PM
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#13
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,160
M.O.C. #6433
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Quote:
Originally Posted by laverdur
I can't speak to the newer TVs but when I bought mine, with 20" wheels the GVWR was 10,000 lbs but with 18" wheels the GVWR was 11,500 lbs.
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My 2012 F350 SRW came with 20” wheels and 11,500 lb GVWR.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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10-07-2020, 08:43 PM
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#14
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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Quote:
Originally Posted by BB_TX
My 2012 F350 SRW came with 20” wheels and 11,500 lb GVWR.
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My 2014 3500 Ram SRW came with 18" wheels and 12,300 lb GVWR.
__________________
2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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10-08-2020, 08:02 AM
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#15
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,160
M.O.C. #6433
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Quote:
Originally Posted by Montana Man
My 2014 3500 Ram SRW came with 18" wheels and 12,300 lb GVWR.
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The point is that it is not the wheels that determines the GVWR, at least on Fords. What is the GVWR of that same Ram with 20" wheels?
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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10-08-2020, 11:32 AM
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#16
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Montana Master
Join Date: Jan 2017
Location: home base IL, OTR anywhere
Posts: 533
M.O.C. #19382
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Quote:
Originally Posted by BB_TX
The point is that it is not the wheels that determines the GVWR, at least on Fords. What is the GVWR of that same Ram with 20" wheels?
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the GVWR is whatever the sticker says. If RAM does not come with 20" from the factory, changing them out for 20" rims changes nothing on the sticker.
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2017 RAM 3500 Laramie CCLB Dually CTD Aisin, OEM auto level rear air-ride, B&W hitch
2020 3813MS Legacy Cobalt FBP, MORryde 8K IS & pinbox, PI EMS,DIY mods by in-house "craftsman", RV security system Mk1 Beagle Alerter
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10-08-2020, 12:33 PM
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#17
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,160
M.O.C. #6433
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Quote:
Originally Posted by BiggarView
the GVWR is whatever the sticker says. If RAM does not come with 20" from the factory, changing them out for 20" rims changes nothing on the sticker.
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And again, in spite of the post above, the wheel size does not dictate the truck GVWR, particularly since on same brand/same style tire the 20” will have a slightly higher load rating than the 18”. Don’t know if the RAWR would be lower for the 18” or not with the tire being rated lower.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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10-08-2020, 01:06 PM
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#18
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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Quote:
Originally Posted by BB_TX
The point is that it is not the wheels that determines the GVWR, at least on Fords. What is the GVWR of that same Ram with 20" wheels?
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I don't know what the rating is with 20's but all the charts I've seen showed 12300 lbs to be the highest rating for this class/brand of truck. In fact, I've not seen where wheels are mentioned specifically relating to GVWR other than SRW, DRW.
__________________
2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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10-08-2020, 02:30 PM
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#19
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Montana Fan
Join Date: Jul 2018
Location: Marion
Posts: 234
M.O.C. #22281
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I had 20 inch wheels on my 2015 Duramax 2500HD. When I decided to get a fifth wheel I started looking for tires with a better rating than the 3150 pounds that were on there, that was a weak link.
Not easy to find and very expensive. One reason I traded for a dually.
I will not have another truck with 20's on it.
__________________
2019 Montana High Country 384BR
2018 Ram cclb 4x4 6.7 cummins/aisin dually
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10-08-2020, 03:58 PM
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#20
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,547
M.O.C. #2283
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My 20 inch tires are rated at 3750 pounds at 80 psi.
Lynwood
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