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10-08-2021, 09:49 AM #1
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Go from 15" to 16" wheels on Trailer
Hi All - Anybody go up from 15" wheels to 16" wheels?
I have a 2021 Reflection 260RD fifth wheel that rides a tad nose high with my F250 Diesel Super Duty. The rear stabilizer jacks sit little more than 4" off the ground when fully retracted and have scraped a few times going over speed bumps. If I move up to 16" wheels, my thinking is that I'll gain a little trailer height (1.5") that may help with both of those concerns. Has anybody done this? Any thoughts, considerations or comments are greatly appreciated. Thanks.Jeff & Sandy
2021 GD 260RD Fifth Wheel ~ Snoopy
2012 F250 Super Duty 6.7L Turbo Diesel
B&W Companion Slider
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10-08-2021, 02:05 PM #22021 398M Full Body Paint 8k axles. LRH tires. Disc brakes.
Two bathrooms, no waiting 155 fresh, 104 black, 104 grey 1860 watts solar.
800AH BattleBorn Batteries No campgrounds 100% boondocking
2020 Silverado High Country 3500 dually crewcab Duramax Allison
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10-08-2021, 02:35 PM #3
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Jeff we did this in the spring of 2018. We had the GDRV Customer Service Center perform work on our 303 including installing 6K axles, 16" tires and wheels. We gained 1/2" from the wheel and 1.25" in tire diameter for a total of 1.75".
We also gained a little height in the springs as the 5.2K axles/2600 lbs springs were at and exceeding limits for our 303 when loaded on the fridge side resulting in a light sag on the street side vs the curb side. The fridge side when loaded was about 800 lbs. heavier.
In addition early GDRV Reflection fivers did not have the 2" tubing between the frame and axle mounting. We had these 2" tubes added as well to ensure we had more clearance......w/o doing this, we would not had enough clearance between the top of the new setup and bottom of RV especially in situations where the spring was compressed due to road bumps, etc.
The attached picture taken before leaving the FCS Center after measuring front and rear RV to ground shows we were nearly level. RV was empty.
DanLast edited by Canyonlight; 10-08-2021 at 02:40 PM. Reason: corrected math
Dan & Carol
2014 303RLS Reflection #185 (10/2013 build)
2012 Silverado LTZ Crew Duramax 2500HD
2700/16K Pullrite Superglide
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10-08-2021, 03:58 PM #4
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The 16" number is tire diameter. The difference in the sizes being 1" breaks down to 1/2"(radius), which is what you would realize in height change given the same tire aspect ratio.
2010 Jayco 26(SOLD)
2011 Keystone Outback 277RL(SOLD)
2021 Grand Design 268BH
2013 Ford F250 XLT, 6.2L Gas
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10-08-2021, 06:47 PM #5
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You can compare tire diameters using this calculator (be sure and use 1/2 of the diameter as the height you would gain):
https://tiresize.com/calculator/
One thing to keep in mind is clearance from the top of the tire to the underside of the trailer or slide. Typical leaf spring trailer suspension systems have 2-1/2 to 3" of travel... you don't want the tire and the subflooring making contact on a bump or pothole.
RobU.S. Army Retired
2012 F350 DRW CC LB Lariat PS 6.7
2020 Solitude 310GK-R, MORryde IS, disc brakes,
Sailun LRG tires, solar, DP windows, W/D
(Previously in a Reflection 337RLS)
Full time since 08/2015
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10-09-2021, 08:33 AM #6
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First I called Grand Design customer service who said it was a modification and they couldn't comment. Then I went to Les Schwab Tires who said I had the clearances to do it. Existing 15" wheels with ST225/75R15 tires have a 28.31 inch diameter. New 16" wheels with ST235/80R16 tires would have a diameter of 30.79 inches. An increase in diameter of 1.48". LS didn't give info about keeping the 15" rims and getting bigger tires. I'll check that out. Thanks.
There is about 8-10 inches of clearance to the subfloor and my tires are currently 7" apart. The suggestion by LS would reduce this distance by about 3" leaving 4" gap between tires, which I understand is okay.Last edited by Old Man; 10-09-2021 at 08:37 AM.
Jeff & Sandy
2021 GD 260RD Fifth Wheel ~ Snoopy
2012 F250 Super Duty 6.7L Turbo Diesel
B&W Companion Slider
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10-09-2021, 08:40 AM #7
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Jeff & Sandy
2021 GD 260RD Fifth Wheel ~ Snoopy
2012 F250 Super Duty 6.7L Turbo Diesel
B&W Companion Slider
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10-09-2021, 09:33 AM #8
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10-10-2021, 09:43 AM #9
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I did it on my Reflection 220RK Look for my post here and the other place - I included sources for wheels, etc. A couple of things you need to check. Clearance from top of tire to floor and everywhere else should be 3". If you don't have that consider Sumo springs to act as bumper stops. I have the HD set installed - another write up.
I just drove to Georgia and back from SW Colorado) with no issues (huge ride and handling improvement). Going out the trailer was fully loaded (including 1/2 rank water hauling my daughters stuff to her.
Hope this helps2018 Reflection 150 Series 220RK 5th wheel with 6K axle upgrade. B&W 25K OEM Companion, Steadyfast system, 2022 F350 SRW 6.7 King Ranch 8' bed, Trailer reverse lights, rear spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, and Solar
Too windy?
Today, 08:43 AM in General Discussion