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Old 02-22-2013, 08:21 PM   #21
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Smiley,
Here is an attempt to answer your question about tire size…….you say you went from 17 inch rims to 18 inch rims. The important question is; what is the difference in overall diameter of the two sizes? My guess is, the stock 17 inch rims came with 70 series sidewall profile, and your new 18 inch rims have tires with a 60 series sidewall profile. In this example, the stock tires would have an overall diameter of 30.6 inches, yet the 60 series on 18 inch rims would have an overall diameter of 29.6 inches. For this example, the 18 inchers would actually improve your rear end ratio by a small amount. Have a look at your tire specs for overall diameter, before you worry too much about any reduced towing capacity because of that factor.
So since they are 65s, I can go to the original tow capacity of 8200 lbs and GCVW of 14000. This would keep me with a much better buffer in the limits.
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Old 02-22-2013, 08:26 PM   #22
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Yes, allow about 70lbs against the TV's payload.

FYI, depending on the product rating the ship weight on a Reese Strait-Line WDH (with Dual Cam) is 70lbs to 90lbs.

Bob
Thanks Bob. When it comes to the WDH $1000 sounds high to me. Should I look to get one on my own? If so any recommendations? I think I will need one no matter what trailer we end up with.
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Old 02-22-2013, 08:46 PM   #23
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snip.....When it comes to the WDH $1000 sounds high to me. Should I look to get one on my own? If so any recommendations? I think I will need one no matter what trailer we end up with.
Linda,

Yes, the 1K seems a little steep, even if it includes installation. For example, you can get a Reese Strait-Line 1,200/12,000 WDH with Dual Cam for around $500 off the internet. NOTE: The actual WDH weight size rating will be dependent on the potential loaded tongue weight conditions of the particular TT you are considering.

One source for Reese WDH products is: http://tweetys.com/stright-line-trun...hitch-kit.aspx

Please note: You will be towing off the RV dealer's lot under "unloaded" TV/TT conditions, the WDH will have to be re-adjusted under loaded TV/TT conditions.

Bob
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Old 02-22-2013, 09:12 PM   #24
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Yes, the 1K seems a little steep, even if it includes installation. For example, you can get a Reese Strait-Line 1,200/12,000 WDH with Dual Cam for around $500 off the internet. NOTE: The actual WDH weight size rating will be depended on the potentinal loaded tongue weight conditions of the particular TT you are considering.


Thanks Bob. I will look at that. $500 saved is a few tanks of gas!

Please note: You will be towing off the RV dealer's lot under "unloaded" TV/TT conditions, the WDH will have to be re-adjusted under loaded TV/TT conditions.

Bob[/QUOTE]
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Old 02-22-2013, 11:23 PM   #25
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Smiley,
A tire size of 275-65-18 has an overall diameter of 32.2 inches.

Often the base tire size would be 245-70-17 for a diameter of 30.6 inches. Sometimes the truck will come from the factory with an optional 265-70-17 for a diameter of 31.7 inches. From this info, the optional tire diameter from the factory is about 3.5 percent more than the base size. The truck's published GCWR will take into consideration the tire size range available from the factory.

My original example made the assumption that the first number of the tire size didn't change with your new tires. I should have been more thorough in my example.

The numbers in tire sizes have particular meaning. For example with your new tires, the 275 number is the width in millimeters (about 10.8 inches), and the 65 means the sidewall height is 65 percent of the width. This makes it wider than a 245 or a 265, and 65 percent of that 275 width makes the overall diameter slightly more.

I am assuming the base tire size is 245-70-17. Have a look at the sticker on the inside edge of the driver door, to see the tire size the truck was shipped from the factory with. The driver door sticker will tell you this OEM size.

A larger overall diameter is not favorable for your rear end ratio, although it looks like you are only about 1.5 percent larger than what I assume to be the factory size range. Again, have a look at the driver door to confirm the factory size.
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Old 02-23-2013, 09:42 AM   #26
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[QUOTE=David472;118503]Smiley,
A tire size of 275-65-18 has an overall diameter of 32.2 inches.

Here is a comparision chart with my info:
Stock Tire - 255/70R17 Search Tires Tire 1 - 275/65R18 Search Tires
Section Width: 10.03 in 255 mm
Section Width: 10.82 in 275 mm

Rim Diameter: 17 in 431.8 mm
Rim Diameter: 18 in 457.2 mm

Rim Width Range: 6.5 - 8.5 in
Rim Width Range: 7.5 - 9.5 in

Overall Diameter: 31.05 in 788.67 mm
Overall Diameter: 32.07 in 814.57 mm

Sidewall Height: 7.02 in 178.30 mm
Sidewall Height: 7.03 in 178.56 mm

Radius: 15.52 in 394.20 mm
Radius: 16.03 in 407.16 mm

Circumference: 97.54 in 2477.5 mm
Circumference: 100.7 in 2557.7 mm

Revs per Mile: 669.8
Revs per Mile: 648.5

Actual Speed: 60 mph 100 km/h
Speedometer1: 58.0 mph 96.8 km/h

Speedometer Difference: - Speedometer Difference: 3.284% too slow
Diameter Difference: - Diameter Difference: 3.19%

So according to this the dealer should have never used this size tire on the truck as it affects braking. Might look good but I forsee problems down the road. They changed the tires and said they would put back the original size tires on them if we like. Should I go this route? Thanks again for all your time and help. I really don't think I would want to stray from a Jayco because of the the wonderful support and knowledge of its users. You guys are the ones who really make the Jayco name stand out!!
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Old 02-23-2013, 10:27 AM   #27
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Smiley,
If you have the option of going back to your original tire size which came from the factory, you will be happier when it comes to towing a TT. Just my 2 cents worth.
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Old 02-23-2013, 10:53 AM   #28
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Smiley... you may want to consider a suspension kit such as http://www.activesuspension.com. Being close to your F150 limits, this might give you a little more comfort. I'm in the same boat as you except my TT has been ordered. I think you and I will be just fine towing, but will have to take it easy on steep incline/decline's. I'm do not expect to be speed racer when towing my TT, but do not think that our f150's or myself as the operator will have any troubles. I am ordering the above mentioned suspension kit and plan on putting it on myself. I've done the research on it and spoke to be Ford dealer about towing and they mentioned this same kit that I was already researching. Good luck and just take it easy out there on the road! Jay
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Old 02-25-2013, 09:30 AM   #29
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Ok so my game plan is to go to the dealer and hook up the trailer. I know it will not have my WDH on it yet and will be dry but want to see how it feels. I want to then take both to the CAT scale to see what GCVW it at this point and get tongue weight. The Rv dealer is about 1/2 mile from house and the CAT scale is less then a mile from there. Am I crazy to even do this?
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Old 02-25-2013, 10:07 AM   #30
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Linda,

Going to the CAT scale under your TV/TT "unloaded" condition isn't really going to give you any real usable weight data. Also, the TT's tongue weight (based on the actual Ship Weight) may exceed your TV's receiver "weight carrying" mode weight limit and towing any distance under this condition I wouldn't recommended (without a WDH) ...., that's just me.

As mentioned in an earlier post, taking your TV to the CAT scale ahead of time under simulated "going camping" loaded conditions will give you some real usable weight data (ie; amount of payload weight remaining).

Bob
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