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Old 03-10-2018, 06:08 AM   #1
rcb
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Tire Size?

Ladies and Gentleman,

I have a keystone Passport with a tire size of 205/75R 14C with factory wheels and tires (currently). I am like everyone else on earth and getting rid of the "bombs".

I am keeping the factory wheels and upgrading the tires. Should I stick to this factory tire size or do I have room to get a larger tire. And If I can get a bigger tire what is the advantage of doing so?

Thanks
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Old 03-10-2018, 06:52 AM   #2
JRTJH
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Here is what you have and what you can get if you stay with your current wheels:

205/75R14 LRC @ 50 PSI max 1760 pounds x 4 = 7040 max tire capacity
205/75R14 LRD @ 65 PSI max 2040 pounds x 4 = 8160 max tire capacity

So you can install load range D tires in the same size and increase your capacity by 1120 pounds.

WalMart has Carlisle Radial Trail HD tires in that size for $50 each. They are currently out of stock on the WalMart website, so when they are back in stock, they should be a relatively current manufacture date.
https://www.walmart.com/ip/Carlisle-...-D-8/189531797
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Old 03-10-2018, 07:12 AM   #3
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You don't give the size of your trailer but running 14s I'm assuming it's not a big trailer. Given that, I would go with the LRD upgrade in the same size. Much less expense than new wheels etc., less problematic (actually easy) and accomplishes what you're after.

Note: and I do recommend the Carlisle Radial HDs. That's what I put on in 2016 and have been very pleased.
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Old 03-10-2018, 10:36 AM   #4
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I kept my stock wheels and upgraded the load range on original size Carlisle tires.


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Old 03-10-2018, 11:10 AM   #5
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Thanks for the advise. It is a 29ft TT that weights around 5500lbs dry.
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Old 03-10-2018, 03:24 PM   #6
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When increasing load capacity with the same designated tire size (ST205/75R14) from LRC - LRD there isn’t a warranty problem, they both use the same load inflation chart and provide the same load capacity at 50 PSI. However, there are a couple of safety checks you should confirm. One is the load capacity and PSI limits of the current wheels. The PSI is the primary concern because you’ll have to use inflation pressures above the 50 PSI limit of the LRC tires if you want to gain some desirable load capacity reserves from the LRD tires. . Sometimes the wheel/tire assembly provider will put the assembly together using the trailer manufacturer’s recommendations. That means a minimum PSI (50) valve stem may have been used and will have to be upgraded. Steel bolt-in valve stems are recommended for trailer wheels and they are very desirable if you want to add a Tire Pressure Monitoring system.
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Old 03-13-2018, 11:01 AM   #7
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Quote:
Originally Posted by CWtheMan View Post
When increasing load capacity with the same designated tire size (ST205/75R14) from LRC - LRD there isn’t a warranty problem, they both use the same load inflation chart and provide the same load capacity at 50 PSI. However, there are a couple of safety checks you should confirm. One is the load capacity and PSI limits of the current wheels. The PSI is the primary concern because you’ll have to use inflation pressures above the 50 PSI limit of the LRC tires if you want to gain some desirable load capacity reserves from the LRD tires. . Sometimes the wheel/tire assembly provider will put the assembly together using the trailer manufacturer’s recommendations. That means a minimum PSI (50) valve stem may have been used and will have to be upgraded. Steel bolt-in valve stems are recommended for trailer wheels and they are very desirable if you want to add a Tire Pressure Monitoring system.
How do you determine the "load capacity and PSI limits of the current wheels"?
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Old 03-13-2018, 11:21 AM   #8
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Originally Posted by kinggartk View Post
How do you determine the "load capacity and PSI limits of the current wheels"?
It's stamped on the reverse side of the wheel (typically on the spoke) or is stamped inside the wheel, in which case you'd need to remove the tire to see the rating stamp. Here's one example
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Old 03-13-2018, 12:34 PM   #9
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My wheels did not have the psi rating, just the weight rating which you can correlate back to the psi rating. They had the E rated weight stamped (28??) at 80 psi vs the 2540/65psi of the OEM tires.
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Old 03-13-2018, 03:56 PM   #10
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Originally Posted by JRTJH View Post
It's stamped on the reverse side of the wheel (typically on the spoke) or is stamped inside the wheel, in which case you'd need to remove the tire to see the rating stamp. Here's one example
IMO, those pictures confirm that the wheel is manufactured in two configurations. One is for four lug mounting and provides 2540# of load capacity with a maximum recommended PSI pressure of 65 PSI. The other configuration is for 5 lug mounting and provides 2830# of load capacity with a recommended maximum PSI pressure of 80 PSI.

NOTE: When increasing a tire's load capacity by increasing its PSI, one must insure the valve stem is certified for the higher PSI.
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