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09-21-2022, 10:27 AM
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#1
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Senior Member
Join Date: Aug 2012
Location: Kalamazoo
Posts: 202
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Mismatched Wheel and Tire Max Load
I am WAY overdue for replacing my factory original tires (205/74R14C). My wheels have max limits of 1900 lbs / 65 PSI. I would like to upgrade to 205/75R14D GY Endurance tires which have max limits of 2040 lbs / 65 PSI. As long as I remember that the max load is limited by the wheel (1900 lbs) and not the tire (2040 lbs), is there any issue with putting this tire on this rim? I'm not about to buy new rims given the limited use our trailer gets, so the alternative would be to stay with load Range C tires.
__________________
Bill
Kalamazoo, MI
2013 Premier 19FBPR
2023 Ford F150 SuperCrew 5.0L V8, 3.73 Rear Axle (Photo to be updated)
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09-21-2022, 10:52 AM
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#2
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Site Team
Join Date: Oct 2011
Location: Joppa, MD
Posts: 11,757
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Where did you get the max wheel rating from? If the wheel supports 65 psi then it should support a load range "D" tire as the air supports the weight, the tire contains the air. I would go with Carlisle Radial Trail HD tires in a D rating.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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09-21-2022, 11:07 AM
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#3
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Senior Member
Join Date: Aug 2012
Location: Kalamazoo
Posts: 202
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Thanks. The wheel load rating is stamped on the back of the wheel, and I found the PSI rating on the Sendel website (where the load rating is also listed as 1900 lbs).
__________________
Bill
Kalamazoo, MI
2013 Premier 19FBPR
2023 Ford F150 SuperCrew 5.0L V8, 3.73 Rear Axle (Photo to be updated)
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09-21-2022, 01:30 PM
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#4
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Site Team
Join Date: Oct 2011
Location: Joppa, MD
Posts: 11,757
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A gvw of 6500 would yield around 850 lbs tongue weight. 6500 -850= 5650 lbs on the 2 axles. 5650÷4 =1,412.5 lbs per wheel at max trailer weight. So a wheel rated for 1,900 lbs would give you over 500 lbs. of reserve capacity per wheel. I wouldn't worry about the "mis-match as the lowest of the numbers (the wheels) will have plenty of reserve.
If you go with a D rated tire then you can put 65 psi (according to your numbers) but it will not increase the load capacity beyond the original 6,500 lb. GVW of the trailer.
__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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09-21-2022, 02:24 PM
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#5
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Senior Member
Join Date: Aug 2012
Location: Kalamazoo
Posts: 202
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Quote:
Originally Posted by flybouy
If you go with a D rated tire then you can put 65 psi (according to your numbers) but it will not increase the load capacity beyond the original 6,500 lb. GVW of the trailer.
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That was my thinking exactly, but it helps to hear it from someone else.
__________________
Bill
Kalamazoo, MI
2013 Premier 19FBPR
2023 Ford F150 SuperCrew 5.0L V8, 3.73 Rear Axle (Photo to be updated)
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09-22-2022, 04:19 AM
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#6
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Senior Member
Join Date: Feb 2010
Location: Taylors, SC
Posts: 3,031
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Quote:
Originally Posted by MISailor
That was my thinking exactly, but it helps to hear it from someone else.
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The specs for your trailer shows the OE tires being ST205/75R14 LRC. With trailers older than 2017 it's a wise choice to upgrade the designated size from LRC to LRD to gain the much-needed load capacity reserves. Wheels and valve stems need to be confirmed for supporting 65 PSI.
Designated sized tires with different load ranges can be used on the same axle. However, the inflation pressure MUST be the same in both tires.
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