|
|
05-10-2019, 11:08 AM
|
#1
|
Montana Fan
Join Date: Oct 2015
Location: Aquebogue
Posts: 120
M.O.C. #17988
|
235/80 vs 235/85
Getting ready for new rubber, & going to go with the Sailuns. I see by the Sailun chart that the 235/85 R16 has a 200lb higher load capacity than the 235/80, which is the stock size on my 2011 Montana. Anyone here go with the 85's over the 80's. Going to go with a pre mounted package from Trailer Set Go, anyone deal with them recently?
John
__________________
2010,3075RL, Hickory
2016 Ford, 6.7, 4X4, SRW
|
|
|
05-10-2019, 11:21 AM
|
#2
|
Montana Master
Join Date: Apr 2017
Location: 1000 oaks
Posts: 961
M.O.C. #19630
|
Went with the 85's as I needed the albeit small increase in height.
What rims do you get with the pre mounts?
Why change?
__________________
2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
|
|
|
05-10-2019, 12:04 PM
|
#3
|
Montana Fan
Join Date: Oct 2015
Location: Aquebogue
Posts: 120
M.O.C. #17988
|
Quote:
Originally Posted by prndl
Went with the 85's as I needed the albeit small increase in height.
What rims do you get with the pre mounts?
Why change?
|
Last tire change was 5yrs ago, & I put 17.5" goodyears on the Monty, time for a change & I just don't like the Goodyears, although I never have had a problem, & have grown not to like having 17.5's on the rig. Trailer set go offers the 80"s for $285 & the 85's for $330 both mounted on aluminum rims rated for the correct PSI, & balanced with free shipping. Extras are center caps, & lug nuts.
John
__________________
2010,3075RL, Hickory
2016 Ford, 6.7, 4X4, SRW
|
|
|
05-10-2019, 03:08 PM
|
#4
|
Montana Master
Join Date: May 2017
Location: new caney
Posts: 1,050
M.O.C. #19873
|
Why is the price difference so great? I have the 85's and the tires were not but maybe 10.00 difference at most.The wheels should be the same as 80 or 85's fit the same wheel even though the 85's are slightly taller and wider. I bought Hi-Spec modular wheels for my rv for 99.00 plus shipping not including center caps and lug-nuts. I'm not saying you are paying to much for the 80's but I do believe to much for the 85's. The 80's or 85's have more carrying capacity than the wheels at 3750#. For the price difference I would go with the 80's and I wouldn't go with a wheel that has a spoke as the spokes are the weak part of the wheel as I can attest to with having 2 go bad.
|
|
|
05-10-2019, 05:47 PM
|
#5
|
Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
|
The replacement tires on our ould rig were 85's and worked well.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
|
|
|
05-10-2019, 06:30 PM
|
#6
|
Montana Master
Join Date: Jul 2010
Location: Lake Havasu City AZ.
Posts: 1,811
M.O.C. #10552
|
I when from 80s to 85s why? Cause a bit better weight and I wanted to.
__________________
Wayne and Ann Moore
2015 Ford F-350 King Ranch
Firestone air bags, bed saver.
Add 40 GAL tank in bed.
|
|
|
05-11-2019, 10:42 AM
|
#7
|
Montana Master
Join Date: Jan 2015
Location: Taylors
Posts: 562
M.O.C. #15948
|
It's the axle spacing that can cause the most problem when going from 80 to 85. RV trailer manufacturers seem to put axles as close together as possible. Those with a 32" spacing will not allow the use of the 85 tires.
Another dilemma when changing from 80 - 85 is the tire placard and certification labels become invalid, as the tires are not of the same designated size and the load inflation charts for the 80 will not work for the 85.
Here is a ST tire load inflation chart.
https://fifthwheelst.com/documents/C...T-Modified.pdf
|
|
|
05-11-2019, 11:34 AM
|
#8
|
Montana Fan
Join Date: Oct 2015
Location: Aquebogue
Posts: 120
M.O.C. #17988
|
Thanks for the info, are you referring to 32" between the axles?
John
__________________
2010,3075RL, Hickory
2016 Ford, 6.7, 4X4, SRW
|
|
|
05-11-2019, 12:35 PM
|
#9
|
Montana Master
Join Date: Jan 2015
Location: Taylors
Posts: 562
M.O.C. #15948
|
Quote:
Originally Posted by lundwc16
Thanks for the info, are you referring to 32" between the axles?
John
|
Yes, center to center. Most 85s are 31.7" in outside diameter and most axle manufacturers post clearances between tires should not be less than 1".
When measuring, I recommend doing both sides.
|
|
|
05-11-2019, 01:10 PM
|
#10
|
Montana Fan
Join Date: Oct 2015
Location: Aquebogue
Posts: 120
M.O.C. #17988
|
I can't get under the rig to measure today, but I was able to find some interesting numbers on line. I currently have Good Year G114's on the trailer size 215/75 R17.5 Good Year says the outside diameter of the tire is 30.2". The diameter of the Sailuns 235/80 R16 is 30.9" & the 85 is 31.7" With the Good Years now I have about 3.5" between the tires, looks like I'll most likely stick with the 80's.
John
__________________
2010,3075RL, Hickory
2016 Ford, 6.7, 4X4, SRW
|
|
|
05-11-2019, 06:12 PM
|
#11
|
Montana Master
Join Date: Jan 2015
Location: Taylors
Posts: 562
M.O.C. #15948
|
Quote:
Originally Posted by lundwc16
I can't get under the rig to measure today, but I was able to find some interesting numbers on line. I currently have Good Year G114's on the trailer size 215/75 R17.5 Good Year says the outside diameter of the tire is 30.2". The diameter of the Sailuns 235/80 R16 is 30.9" & the 85 is 31.7" With the Good Years now I have about 3.5" between the tires, looks like I'll most likely stick with the 80's.
John
|
What was the size of the OEM tires on your trailer? It'll be on the certification label. According to the specs I found the trailer could have been fitted with ST235/80R16 LRE or LRF. If so the switch back to a ST235/80R16 designated size would make the certification label valid again.
|
|
|
05-11-2019, 08:05 PM
|
#12
|
Montana Fan
Join Date: Oct 2015
Location: Aquebogue
Posts: 120
M.O.C. #17988
|
Original size was 235/80R16
John
__________________
2010,3075RL, Hickory
2016 Ford, 6.7, 4X4, SRW
|
|
|
05-11-2019, 09:06 PM
|
#13
|
Montana Master
Join Date: Apr 2017
Location: 1000 oaks
Posts: 961
M.O.C. #19630
|
At the worst you will be 1" closer than you were originally if you go to 85"'s. I used them for the increase in height (1/2")
__________________
2011 2955RL Gen-Y Executive Kingpin
2022 GMC 2500HD Duramax/Alison
4X4 Crew Cab/Standard bed.
|
|
|
05-15-2019, 08:49 AM
|
#14
|
Montana Fan
Join Date: Aug 2018
Location: elmvale
Posts: 105
M.O.C. #22355
|
I just ordered sailun 85,s for my hc. Hope i have the room between looks like i have 5 inches or so. Should be good i need the extra height to level trailer
|
|
|
05-15-2019, 12:09 PM
|
#15
|
Montana Master
Join Date: Sep 2017
Location: Tacoma
Posts: 1,567
M.O.C. #20475
|
You should have plenty of room to use the 85's its only about 1" over all diameter then the 80's I put 85's on are 2017 and have about 4.5" and can still use my X-chocks just fine.
__________________
Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
Happy Trails
|
|
|
05-15-2019, 01:50 PM
|
#16
|
Montana Master
Join Date: Dec 2005
Location: Eugene
Posts: 1,062
M.O.C. #5091
|
After replacing Michelin due to age, went with the 235x85 Sailun tires, the same size as the Michelin tires I replaced after the lousy Marathon "Bombers". Only about 2500 miles on the Sailuns so far after going down to Arizona and back for the winter.
|
|
|
05-15-2019, 02:11 PM
|
#17
|
Montana Master
Join Date: Jan 2015
Location: Taylors
Posts: 562
M.O.C. #15948
|
Quote:
Originally Posted by bigred715
After replacing Michelin due to age, went with the 235x85 Sailun tires, the same size as the Michelin tires I replaced after the lousy Marathon "Bombers". Only about 2500 miles on the Sailuns so far after going down to Arizona and back for the winter.
|
So, you put tires with a maximum load capacity of 4400# each on 6000# GAWR axles.
Below is a link to a Sailun load inflation chart. To stick to tire industry standards, your Sailun tires should be inflated to a minimum cold inflation PSI of 80 PSI. You could actually go down to 75 PSI and still be within replacement tire standards. The 80 PSI will provide more than 20% in reserves per tire.
https://fifthwheelst.com/documents/C...T-Modified.pdf
Note: I may have misinterpreted the Sailun tire size as you did not use a proper nomenclature when explaining your tire sizes. Prefixes such as ST or LT are needed for proper size designations. I got the OE tire size from the trailer specs. I surmised your Michelins were LT tires, 16".
As you can see in the link below, Sailun does have the identical designated sized LT tires as the Michelins you replaced.
https://www.sailuntire.ca/PLT/AT.html
|
|
|
05-15-2019, 03:41 PM
|
#18
|
Montana Master
Join Date: Aug 2015
Location: SWFL
Posts: 964
M.O.C. #17801
|
No clearance issues with 85s on my 2016, 3711FL, and I can care less about "invalidating" the tire placard.
__________________
2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
|
|
|
05-15-2019, 09:22 PM
|
#19
|
Montana Master
Join Date: Dec 2005
Location: Eugene
Posts: 1,062
M.O.C. #5091
|
I had 235/85 16 Michelin at 80PSI when cold for my second set of tires after the 235/80 Marathon tires blew out. Replaced with Sailun 235/85 16 at about 90 PSI cold.
|
|
|
05-22-2019, 07:39 AM
|
#20
|
Montana Master
Join Date: Jan 2015
Location: Taylors
Posts: 562
M.O.C. #15948
|
Quote:
Originally Posted by phillyg
No clearance issues with 85s on my 2016, 3711FL, and I can care less about "invalidating" the tire placard.
|
Because a lot of RV trailer owners change tire sizes without the advise of trained tire installers their new tires are never properly identified.
The tire industry have standards they follow when installing replacement tires that do not conform to the information on the vehicle federal certification label, tire placard or in the vehicle owner's manual. NHTSA allows the use of auxiliary labels. They would normally be filled-out by a savvy installer and placed adjacent to the trailer's original labels. They will display the replacement tires sizes and the new recommended inflation pressures for them. That information protects the owner from getting improper servicing from a 2nd party and protects the field when the trailer changes hands.
Did you also put-off registering your new tires?
|
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Threads |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|