Taboky
Nashua, NH
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Joined: 07/14/2007
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OK, I would love to upgrade my rims/tires to 16". My Raptor sits at 13'5" now on 225/75r15. I fifgured I would check to see what the '08 Raptor, same model but with 16" tires used. They sit on 235/80r16, which by my measurements are almost 2" taller. Yet, the height on the rig is listed at 13'4". How can they use a taller tire yet have a lower height? My big comcern about upgrading to 16" tires is the hieght. I am already to close to the standard 13'6" of big rigs.
What am I missing?
Steve
'07 Raptor 3712
'08 F350 DRW Lariat crewcab longbed 4.10ls 4x4
'02 Kawasaki Nomad dresser
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Golden_HVAC
Fulltime, CA, USA
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Joined: 08/19/2003
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They might be using springs with longer length and are not as tall. But who really knows. Your 13'6" might be an "Estimate". The accurate way to check your actual hieght is to pull under something that is slighly taller than the RV then measuring the top of the RV to the underside of the carport or 14' tall doorway that you pulled under. Then carefully measure the carport to the ground and do the math.
You might find that your RV "As Equipped" is slightly lower than the advertized hieght. And they might have claimed that the 13'6" high is the maximum hieght, while all of the RV's where slightly lower than that high, so that they don't accidently make a RV that is 2" higher than the claimed hieght, and have an owner place a claim because they ran into a 13'6" bridge.
I know that I was a bit nervous when passing under a brick railroad bridge that was marked 11'6" with my RV that has a manufactures claimed hieght of 11'4" tall. But I heard no scrapping noises. And I went as close to the center of the archway. I was just hoping that the highway department did not add 2" of asphalt after the bridge was marked 11'6".
Also consider that when the RV is loaded it will sit slightly lower than when unloaded. And if the fifth wheel roof is the highest part, then the total overall hieght can be effected by how high the hitch rides on the truck. So if hitched to a taller truck with 4 wheel drive or a lift kit might be taller than the average trailer. Many times it is the air conditioner that is the tallest point.
Fred.
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WhitehouseLV
Formerly Las Vegas, Now Big Sky State - Montana
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Good old Raptor tires. Sorry I dont have an answer to your question. There have been a few people here that upgraded to the 16" Mich XPS Ribs. Just an FYI check the ratings on your wheels and tires. I have a 2006 3612 w/same size tires (Mission) as you have on your 07. Max load on my wheels and tires say 2540 per tire. Multiply that by 6 and I'm under the GVWR of the TH??? I'm working with Keystone and Tireco to get all new tires.
Traveling Whitehouse
2006 Keystone Raptor 3612DS 
2004 Chevrolet Silverado 3500 CC LB DRW Duramax LLY 4x4 
Reese 20K Hitch
Prodigy Brake Control
2007 Honda Rincon & 2000 Honda Rancher
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Taboky
Nashua, NH
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WhitehouseLV, don't forget that about 3k lbs is on the landing gear or hitch. So the 6 wheels hold 15,240lbs, and the hitch/landing gear around 3k lbs, total capacity is ~18,240lbs. Wheels are really fine for the rig. If we could get decent tires in that size, all would be good.
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WhitehouseLV
Formerly Las Vegas, Now Big Sky State - Montana
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Taboky wrote:WhitehouseLV, don't forget that about 3k lbs is on the landing gear or hitch. So the 6 wheels hold 15,240lbs, and the hitch/landing gear around 3k lbs, total capacity is ~18,240lbs. Wheels are really fine for the rig. If we could get decent tires in that size, all would be good.
 I feel like a dumb@ss!  I realized this at work this morning going over the #s and they didn't add up to yesterday. My mind must be on vacation. To get back to your topic, would 2" make that big of a difference? How would if affect you being a little over 13'6"?
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johntank
Oxford, Ms 38655 USA
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Just remember only 1/2 of the diameter difference of a smaller tire to a larger tire is what the trailer will be raised.
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Taboky
Nashua, NH
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I believe anyhting over 13'6" is oversize and needs a permit. Since big rigs are at 13'6", I wouldn't want to go over that. Just can't figure out how, with a bigger tire on the same rig, the overall height decreased? Maybe I will just take my rig to the dealer and park beside a 2008 model to compare
I am going to go and put a level on the AC and measure to the ground. I'll report if it is close to the spec sheet or not.
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SAS!
So. Cal.
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Joined: 04/29/2005
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I got this from HERE about half way down the page.
This is from info for a commercial Drivers License so I would think it is a national law? I could be wrong..........again?
Height Of Vehicles And Loads
The vehicle height limit and/or load limit, measured from the surface of the roadway on which the vehicle stands, is 14 feet.
Exceptions:
Double deck buses may not exceed 14 feet, 3 inches.
Farming equipment moved incidentally over a highway.
2008 Rage'n Falcon 34-05
2004.5 RAM 3500 QC 4X4 SLT SRW CTD 600
2001 Bombardier DS 650
2001 Yamaha Raptor 660
2004 Suzuki Z 250
CORVA........The Action Program........The BlueRibbon Coalition ........aSa
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rocmoc
Tucson, AZ/Mexico
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Joined: 09/30/2006
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When we installed the second AC on the front of our 3612, it appeared to be taller. The actual height measured 12'4" but we treat it as 12'6" for safety sake. A bounce in the pavement or a root could easily take away space between the roadway and a structure. We have come close a couple of times entering RV parks and on a railroad bridge crossing. The railroad bridge crossing was 12'8" arced so much to the displeasure of the oncoming traffic, we drove down the center of the road. Who knows where they take the measurements or if bridge has settled. Good luck!
rocmoc n AZ/Mexico
rocmoc n AZ/Mexico
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