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Old 03-26-2015, 12:17 PM   #1
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18' or 20' tires?

I recently purchased a 2005 F150. Came with 2 sets wheels & tires.
20' Roush wheels installed from factory. Also have a set of 18's. Both have P range tires. Tires are good so I won't be upgrading until next year.

Wondering if I should run 18's or 20's when towing my 28BHS?
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Old 03-26-2015, 12:25 PM   #2
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I don't think the rim size will matter. What might be an issue are the P range tires. Those are passenger tires. They may not have the load capacity you need for that trailer. You probably want at least a D. I'm sure others will have better info. Check the max load per tire on what you have, subtract the vehicle GVWR and the trailer tongue weight as it will be for towing, not the dry tongue weight. It will probably be closer to 1,000lbs.
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Old 03-26-2015, 01:29 PM   #3
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What's the OD difference in the mounted tire? Smaller would be better for towing. If they are the same OD based upon the profile of the tires then it would not matter. But I do agree that you need some LT's with a load range.
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Old 03-26-2015, 01:47 PM   #4
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Quote:
Originally Posted by ddrueckh View Post
I don't think the rim size will matter. What might be an issue are the P range tires. Those are passenger tires. They may not have the load capacity you need for that trailer. You probably want at least a D. I'm sure others will have better info. Check the max load per tire on what you have, subtract the vehicle GVWR and the trailer tongue weight as it will be for towing, not the dry tongue weight. It will probably be closer to 1,000lbs.
Just checked...20's are Cooper Discover H/T load 2835 max psi of 50.
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Old 03-28-2015, 01:03 AM   #5
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New to the forum. I'm in the process of buying my first TT(26bhs). I was looking in my owners manual(2006 f150) to find out my tow rating and noticed the tow rating was higher for 17" vs18". Not sure why but maybe the 18s would be better than your 20s? Anyone know why?
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Old 03-28-2015, 06:03 AM   #6
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Originally Posted by Emberley_J View Post
New to the forum. I'm in the process of buying my first TT(26bhs). I was looking in my owners manual(2006 f150) to find out my tow rating and noticed the tow rating was higher for 17" vs18". Not sure why but maybe the 18s would be better than your 20s? Anyone know why?
Distance from center of wheel to where rubber hits the road is a resistance load. Its a lever principle. Big wheels are for ground clearance top end gearing for dragsters and looks. Small wheels are for power transfer to the road.

Rim size is not the only factor, tire profile also factors in.
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Old 03-28-2015, 08:47 AM   #7
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Ya I get that two different OD Tires are going to have different tow ratings but why would 17"rims have a higher rating then 18s if the tires have the same OD?unless they are? I'll have to check. Thanks for the reply
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Old 03-28-2015, 09:13 AM   #8
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Ya I get that two different OD Tires are going to have different tow ratings but why would 17"rims have a higher rating then 18s if the tires have the same OD?unless they are? I'll have to check. Thanks for the reply
18's come with a higher load range than the 17's .
18's can go as high as 3700, 17's are maxed at 3200 usually.
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Old 03-28-2015, 09:18 AM   #9
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That make sense. I never thought about a load range on the rims. Thanks
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