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05-08-2022, 10:43 AM
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#1
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Montana Fan
Join Date: Mar 2022
Location: LYNDEN
Posts: 286
M.O.C. #30751
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Understanding weight ratings
I understand what GVWR is, the total max weight of a loaded FW. Mine is 12,140 according to the sticker on the trailer. Sticker says GAWR is 5,080 or 10,160 for both axles combined. Does this mean I have 6k axles? Tires are 235/85R16E from the sticker. Am I good to go then if my present tires meet this spec and are two years old? Model is FW in my signature.
__________________
2003 Holiday Rambler Navigator 43PKD 500HP 11L Cummins ISM
2005 Keystone Montana 2955RL (sold)
1999 F350 SC (sold)
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05-08-2022, 12:25 PM
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#2
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,366
M.O.C. #4831
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It has been a while, but I recall my 2005 2955RL had 5,200 lb. axles (I always believed they were de-rated 6K ones) with Load Range E tires. The axles were barely adequate for the RV with little reserve capacity. Remember GVWR minus the pin weight equals the axle load.
The Load Range E tire is rated for 3,195 lbs. which is fine for your RV.
You are good to go IMO.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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05-08-2022, 12:54 PM
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#3
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Montana Master
Join Date: Jan 2015
Location: Taylors
Posts: 562
M.O.C. #15948
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Back in the day it was keystone's policy to derate axles to a GAWR value they wanted to use. They normally used a 5200# axle when derating to 5080#. The derated value becomes certified at 5080. In later years Keystone would use ST225/75R15 LRD tires to satisfy the 5080# vehicle certified axles.
The LT235/85R16 LRE @ 80 PSI has an official load capacity of 3042#. The ST235/85R16 LRE has a load capacity of 3640# @ 80 PSI.
Load range letters are the official method for determining load capacities for all ST & LT tires according to a NHTSA 2007 ruling. The prefix letters LT & ST also became a part of all ST/LT tire "designated sizes".
The only reason for tire load index numbers on ST/LT tires is to officially display a tire speed letter. (Thank President Trump for that).
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05-08-2022, 04:32 PM
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#4
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Montana Fan
Join Date: Mar 2022
Location: LYNDEN
Posts: 286
M.O.C. #30751
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Quote:
Originally Posted by Carl n Susan
Remember GVWR minus the pin weight equals the axle load.
The Load Range E tire is rated for 3,195 lbs. which is fine for your RV.
You are good to go IMO.
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Based on GVWR of 12,140 minus the 2600 pin weight I'm at 9,540 for trailer axles or 4,770 per axle or 2385 per tire. Am I thinking correctly?
__________________
2003 Holiday Rambler Navigator 43PKD 500HP 11L Cummins ISM
2005 Keystone Montana 2955RL (sold)
1999 F350 SC (sold)
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05-08-2022, 04:35 PM
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#5
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,366
M.O.C. #4831
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You are thinking, and calculating, correctly. Just use a good quality LRE tire.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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05-09-2022, 09:21 PM
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#6
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Montana Fan
Join Date: Mar 2022
Location: LYNDEN
Posts: 286
M.O.C. #30751
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Quote:
Originally Posted by Carl n Susan
You are thinking, and calculating, correctly. Just use a good quality LRE tire.
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FW came with Power King TowMax ST235/85R16 that are about 3 years old and have great tread on them. Not sure of the quality of these tires or if they are a "good quality LRE tire".
__________________
2003 Holiday Rambler Navigator 43PKD 500HP 11L Cummins ISM
2005 Keystone Montana 2955RL (sold)
1999 F350 SC (sold)
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05-10-2022, 08:05 AM
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#7
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Montana Master
Join Date: Aug 2015
Location: SWFL
Posts: 964
M.O.C. #17801
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Quote:
Originally Posted by Joint Venture II
FW came with Power King TowMax ST235/85R16 that are about 3 years old and have great tread on them. Not sure of the quality of these tires or if they are a "good quality LRE tire".
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Power Kings are reportedly one of the worst. ConsIder yourself fortunate that you've gotten three years out of them.
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05-10-2022, 09:25 AM
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#8
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Montana Fan
Join Date: Mar 2022
Location: LYNDEN
Posts: 286
M.O.C. #30751
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Well if Power Kings are a poor choice then what is a good choice for my FW? I just finished putting 6 new Michelin tires on my truck and would consider Michelin XPS
RIB 235/85R16 LRE for the FW as well. Rated at 3042# seems it would be adequate.
__________________
2003 Holiday Rambler Navigator 43PKD 500HP 11L Cummins ISM
2005 Keystone Montana 2955RL (sold)
1999 F350 SC (sold)
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05-10-2022, 10:34 AM
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#9
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Montana Master
Join Date: Aug 2015
Location: SWFL
Posts: 964
M.O.C. #17801
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Quote:
Originally Posted by Joint Venture II
Well if Power Kings are a poor choice then what is a good choice for my FW?......
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GY Endurance. Not necessary to upgrade to G-rated tires in your case.
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05-10-2022, 11:11 AM
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#10
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,366
M.O.C. #4831
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The 2005 2955RLs came with Load Range E LT tires. The Michelin XPS
RIB 235/85R16 LRE is a good LRE LT tire and I wouldn't be afraid to use them. There used to be a list of "good" LRE tires (the Tow Max wasn't on it), but it is likely out of date. The Goodyear Endurance is a popular choice in the ST type tire.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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05-10-2022, 04:11 PM
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#11
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Montana Fan
Join Date: Mar 2022
Location: LYNDEN
Posts: 286
M.O.C. #30751
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Over the years buying tires for my trucks, wifes car and 5 kids cars I've developed a pretty good relationship with a local tire dealer. Have used many a set of Michelins especially on kids cars as they drove many a mile across the country going to and from college. Never a flat or any tire issues. Balanced well and tire life was very good. My last set on my truck were Michelins and they ran 8 years before i put new on due to age of tires. Ran them 55k miles and no regrets. One thing I've noticed on the FW tires, they are not balanced. Granted they seem to be wearing well, all 4 are equally worn and even across the tread. Should I consider having new tires balanced? My concern is our planned trip to the east coast in late July and returning through the south in the fall. About 8k miles and tire problems are not something I want. I generally cruise at 62-66 as this is my "sweet spot" for mileage and comfort.
__________________
2003 Holiday Rambler Navigator 43PKD 500HP 11L Cummins ISM
2005 Keystone Montana 2955RL (sold)
1999 F350 SC (sold)
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05-10-2022, 05:45 PM
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#12
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Montana Fan
Join Date: Apr 2017
Location: Indio
Posts: 103
M.O.C. #19705
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Quote:
Originally Posted by Joint Venture II
Over the years buying tires for my trucks, wifes car and 5 kids cars I've developed a pretty good relationship with a local tire dealer. Have used many a set of Michelins especially on kids cars as they drove many a mile across the country going to and from college. Never a flat or any tire issues. Balanced well and tire life was very good. My last set on my truck were Michelins and they ran 8 years before i put new on due to age of tires. Ran them 55k miles and no regrets. One thing I've noticed on the FW tires, they are not balanced. Granted they seem to be wearing well, all 4 are equally worn and even across the tread. Should I consider having new tires balanced? My concern is our planned trip to the east coast in late July and returning through the south in the fall. About 8k miles and tire problems are not something I want. I generally cruise at 62-66 as this is my "sweet spot" for mileage and comfort.
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Just think of balancing trailer tires in terms of saving both trailer suspension AND trailer contents...we just finished a 5600+ mile trip from west coast to east coast and back...roads would have eaten our FW up externally and internally had the tires not been balanced, along with having the moryde suspension.
__________________
Richard & Judy Blackwell
Indio, Ca.
2014 F350 DRW 4x4 Diesel
2013 3402RL
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05-12-2022, 07:02 AM
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#13
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Established Member
Join Date: Sep 2021
Location: Grand Haven
Posts: 39
M.O.C. #29650
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Quote:
Originally Posted by CalandLinda
Back in the day it was keystone's policy to derate axles to a GAWR value they wanted to use. They normally used a 5200# axle when derating to 5080#. The derated value becomes certified at 5080. In later years Keystone would use ST225/75R15 LRD tires to satisfy the 5080# vehicle certified axles.
The LT235/85R16 LRE @ 80 PSI has an official load capacity of 3042#. The ST235/85R16 LRE has a load capacity of 3640# @ 80 PSI.
Load range letters are the official method for determining load capacities for all ST & LT tires according to a NHTSA 2007 ruling. The prefix letters LT & ST also became a part of all ST/LT tire "designated sizes".
The only reason for tire load index numbers on ST/LT tires is to officially display a tire speed letter. (Thank President Trump for that).
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Where do you people get your information, might want to switch channels
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05-12-2022, 07:32 AM
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#14
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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Cherokee, what was incorrect?
__________________
2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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