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Old 03-11-2017, 01:36 PM   #1
canesfan
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235/80 to 235/85 Can I Do it?

OEM tires are 235/80/R16. I have 4.5" between tires (edit to add - 4.5 on one side and just under 4" on the other as it is sitting). I have just under 4" above on one side and 3" + a tad above on the other because of the slide I guess.

Info for below from here http://www.carlislebrandtires.com/ou...adial-trail-hd

The 80s show to be 30.8 in diameter and the 85s show to be 31.7. So that's almost an inch lost between tires and 1/2" lost above tires. The between doesn't sound like it would be an issue, or would it, the clearance above...I don't know. That's why I'm asking.

I'd maybe like to go with the LR F if I could and my Sendell wheels are rated for 110 PSI according to their website.

http://sendelwheel.com/wheels/t08bmls.html

Last weigh the trailer axles where 10660 and total trailer was 13680, and that was pretty much loaded per normal.

With my current tire size "like new" I would have 855 lbs leeway on each tire "with the above weight". With 3 year old tires (- 30%) I would still have 600 lbs leeway each tire "with the above weight". So if I couldn't go to the larger either E or F I would still be within margins at 3 years. I've never kept a trailer more than 5 years and this one is now going into year 4.

What say, do I have enough clearance to go to an 85 or do I need to stick with the 80s and just a better tire?
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Old 03-11-2017, 02:21 PM   #2
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Canes, we went from the 80 to the 85, LR G Sailuns, on our Raptor. Couldn't really tell any difference. The tires couldn't be better. I'd stay in the neighborhood of Maxxis, Carlisle or Sailun personally. All tried and true.
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Old 03-11-2017, 02:55 PM   #3
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WOW Friend Did not realize you still had those china bombs on there Hopefully you have had a good TPMS system on those tires (Tire Minder). Just wanted to see if we can get a Ford/Chevy forum riot going

About two years ago upgraded to Carlisle Radial Trail HD ST235/85R16 F (pictured) No issues like them 95 PSI. If I remember the diameter of this tire is 1" larger than what you have now. Have plenty of room!!

Same rims as you (pictured) 110 PSI

Did not want to push it or have to upgrade the rims to address the G rated tires (110 PSI) the Carlisle tire selected is 95PSI . Neither did I want to go to a stiffer G and put more force on our frame. Again real happy with this tire and my Tire Minder all 12 are still used. Let the war begin

ADDED: Correction Radial Trail RH not HD
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Old 03-11-2017, 08:32 PM   #4
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No war here. I'm a fan of Carlisle tires and had thought of going from LR E to LR F. I have the room for the extra 1" on both tires. I have enough reserve with the LR E and decided the extra bounce on suspension components was not worth more reserve than was needed. Stayed with the 235/80/R16 LR E, but I'm not saying that is best for everyone.
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Old 03-12-2017, 06:15 AM   #5
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You shouldn't have a problem with the 85s. Trailer suspension typically only moves about 2" so the clearance you have above the tire should be fine. The clearance between tires is plenty as well. If it were mine, I wouldn't hesitate to go with the Carlisle LRF.
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Old 03-12-2017, 07:39 AM   #6
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Thanks All. I guess it will come down to what size I am able to get my hands on in the time frame I have. I will call the tire place I have chosen tm and see if they can come close to Wmarts price. They are a Carsile dealer at least. If not I will see what I can get from Wmart and how fast.
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Old 03-12-2017, 10:15 AM   #7
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Minimum clearance between the top of the wheelwell and tire is 3". Minimum clearance between tires is 1".

You will be hard pressed to find official recommendations allowing rim inflation pressures or load capacity to be exceeded.

Rim manufacturers are not required to display the rim's load capacity or inflation pressure. OEM providers may request it but some do not. The rim manufacturer is required to tag the rim with its serial number/part number and their name and location. The best recommendation is to ask them for the specs.

Most OEM rims (depending on mfgr) for Keystone trailers fitted with ST235/80R16E tires will have a load capacity rating of 3580# at 80 PSI. The ST235/85R16E has a load capacity of 3640# at 80 PSI. However, sometimes Keystone trailers as heavy as yours are often fitted with rims with 3960# of load capacity at 110 PSI. They are ideal for the ST235/85R16F tires provided by numerous ST tire builders. But, not the LT235/85R16G steel cased tires because they all require a single rim width of 6.5".

Make sure to ask the retailer about warranty coverage. Plus sizing is not covered in the Keystone owner's manual. Most retailers will offer warranty coverage if they see the extra load capacity is justifiable and safe.

On edit: Your 3750# rims at 110 PSI are probably 6" wide. Not suitable for the ST235/85R16F (exceeds load capacity) or the LT235/85R15G (smaller rim width). Don't forget to look at the specs for the new USA built Goodyear Endurance ST235/85R16E. It will fit the rim, increase the load capacity above the OE tires and has a "N" speed letter.
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Old 03-12-2017, 10:36 AM   #8
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Quote:
Originally Posted by CWtheMan View Post
Minimum clearance between the top of the wheelwell and tire is 3". Minimum clearance between tires is 1".

You will be hard pressed to find official recommendations allowing rim inflation pressures or load capacity to be exceeded.

Rim manufacturers are not required to display the rim's load capacity or inflation pressure. OEM providers may request it but some do not. The rim manufacturer is required to tag the rim with its serial number/part number and their name and location. The best recommendation is to ask them for the specs.

Most OEM rims (depending on mfgr) for Keystone trailers fitted with ST235/80R16E tires will have a load capacity rating of 3580# at 80 PSI. The ST235/85R16E has a load capacity of 3640# at 80 PSI. However, sometimes Keystone trailers as heavy as yours are often fitted with rims with 3960# of load capacity at 110 PSI. They are ideal for the ST235/85R16F tires provided by numerous ST tire builders. But, not the LT235/85R16G steel cased tires because they all require a single rim width of 6.5".

Make sure to ask the retailer about warranty coverage. Plus sizing is not covered in the Keystone owner's manual. Most retailers will offer warranty coverage if they see the extra load capacity is justifiable and safe.
The picture PARAPTOR posted above re my wheels shows them stamped at 3750 at 110 psi. That's more than the 85 E and less than the F ratings.

But, if as you say the minimum clearance is 3", then I'm going to be past that on one side and close on the other if I go to the 85s.

Also, all the 235 series Carlise tires require a 6.5" rim per their specs (see link I posted). What's the difference between them and a G tire? I do not feel the need to go to a G with the weights I posted above, just curious.

Edit - So how do I find out what width my rims are. I don't have the resources to take them off and need to order tires asap.

Edit - Never mind, according to the Sendell link I posted they are 16x6. So that sux!!! So why do the Carlise 80 LRE require 6.5 when the current OEM garbage of the same size is on a 6" rim? They are the same size tire.
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Old 03-12-2017, 11:31 AM   #9
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Question

Checked my previous post and made a correction My tires are Radial Trail RH 6" rims , specs are as listed in that post above, which I have since corrected to RH. Sorry if that misled you. No idea where I got HD?? Although when I checked your link to Carlisle you were looking at Radial Trail HD (6.5" rims). RH superseded by HD ??
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Old 03-12-2017, 11:38 AM   #10
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did a quick internet search on difference between

Trailer/Hauler: Carlisle Radial Trail HD | Strong Inside and ...
www.rzrforums.net › ... › Supporting Vendors › Discount Tire
Jun 9, 2016 - 15 posts - ‎8 authors
The Carlisle Radial Trail HD brings the latest technology in trailer tires. ... resistance; Increased durability; 10% tread wear over Radial Trail RH .... up to a nicer tire in a higher load range (d vs c) for some piece of mind .... Compare the weight rating on ST 235/80-16 LRE tires to conventional P or LT tires.
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Old 03-12-2017, 12:56 PM   #11
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Well, I guess I'm going to call Carlisle tm and ask them about rim size for the HD as well as the RH. Either they have a typo in their specs or a LOT of people are putting these (HD) tires on the wrong size rims from what I am reading. And they no longer have the RH listed on their site and I haven't yet found any "real" specs on rim size for them. I found one place so far that has them in stock for about $100 each with shipping. Wonder how old they are?

The new GYs are pricey, but may be an option. I'll call my local dealer and ask as he got me a super price on my truck tires, well below ANYONE online had.
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Old 03-14-2017, 06:43 AM   #12
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Talked to the tire place I had picked out. Very nice and very knowledgeable. Been in business forever with excellent reviews. After telling him the details I posted above he said he would only recommend the 80s for clearance reasons, and also stated that after looking at it in person might refuse to install a larger tire (85s) for clearance reasons. I too don't feel comfortable with only ~2-1/2" clearance with the 85s either, that's really cutting it close in my opinion. So, and I know I'll get a lot of flack about this, I'm leaning to sticking with the 80s. Last thing I want is to bottom out the trailer on my brand new tires. They're not going to last long like that. Anyway, he can get the tires in a day, wants $113 where Wmart has them for $77. I have to call him back when I decide what day, going to ask how much if I bring him the tires. He wanted $15 to mount and balance and install.

NO, no new rims, toys, or anything else, except maybe valve stems. He said I could order the N1600s and bring them but he probably has them in stock.
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Old 03-12-2017, 12:59 PM   #13
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Quote:
Originally Posted by canesfan View Post

Edit - Never mind, according to the Sendell link I posted they are 16x6. So that sux!!! So why do the Carlise 80 LRE require 6.5 when the current OEM garbage of the same size is on a 6" rim? They are the same size tire.
IMO Carlisle may have listed the measuring rim size. Why? They build a lot of rims but not a 16X6.5". The measuring rim may be in their testing facility. A tire's published dimensions are somewhat dependent on the measuring rim size.

Sometimes when a tire has a single rim width size the manufacturer will include that information on the tire's sidewall as shown in the picture below. That's a steel cased 16" tire.


http://www.irv2.com/photopost/showfull.php?photo=29709
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Old 03-12-2017, 01:05 PM   #14
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Quote:
Originally Posted by CWtheMan View Post
IMO Carlisle may have listed the measuring rim size. Why? They build a lot of rims but not a 16X6.5". The measuring rim may be in their testing facility. A tire's published dimensions are somewhat dependent on the measuring rim size.

Sometimes when a tire has a single rim width size the manufacturer will include that information on the tire's sidewall as shown in the picture below.

http://www.irv2.com/photopost/showfull.php?photo=29709
Thanks. I'm going to call them for sure. I've been looking at other similar tires and they all seem to have things like "approved rim width" 6" to 7.5". Maxxis for example has 6.0-[6.5]-7.5 on their site. Not sure if the [6.5} is "recommended" size or what?
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Old 03-12-2017, 02:01 PM   #15
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Check your info. Here's what most sites list for the Carlisle. I checked with my local tire shop and there is no problem putting them on a 6" wide rim.

Tire Size: ST235/85R16
Load Range: F
Rim Width (not included): 6.00 in
Tire Overall Diameter: 31.9 in
Section Width: 9.3 in
Load Capacity Single: 3,960 lb
Load Capacity Dual: 3,520 lb
PSI: 95 lb
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Old 03-12-2017, 02:21 PM   #16
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Originally Posted by EVMIII View Post
Check your info. Here's what most sites list for the Carlisle. I checked with my local tire shop and there is no problem putting them on a 6" wide rim.

Tire Size: ST235/85R16
Load Range: F
Rim Width (not included): 6.00 in
Tire Overall Diameter: 31.9 in
Section Width: 9.3 in
Load Capacity Single: 3,960 lb
Load Capacity Dual: 3,520 lb
PSI: 95 lb
Thanks for that. My info is coming from the Carlisle website
http://www.carlislebrandtires.com/ou...adial-trail-hd
6H04651 ST235/85R16 Find a Retailer LRF 31.7 9.3 6.5 3960 95 12 75

Seems to be a lot of discrepency. Going to see if I can find out from "the source" in the morning.
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Old 03-12-2017, 02:27 PM   #17
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Let us know if you get a reply. I inquired by email but never got a response. I did get a response from JEGS and they provided the info I posted above. Not sure what my local tire shop checked, but they verified they could safely mount on my rims.
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Old 03-13-2017, 09:40 AM   #18
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Update

I just talked to Carlisle (after hunting down a phone number) and the gentlemen stated that they mount the tire on 16x6" rims all the time, and that the rim range should be 6-7.5" like most other tires of that size. He did not know why the online specs listed 6.5" only and he looked at the same page I was looking at and have posted in this thread. He apologized for any confusion and said it would hopefully be updated with the correct information.

So, onward.
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Old 03-13-2017, 03:12 PM   #19
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canesfan, OH NO your not done yet! 4 or 5 new tires and maybe a new AL rim for the spare. That should keep you out of trouble for at least a little while before your trip

Added: Sorry forgot the other purchase a TPMS, (Note: if not Tire Minder add metal stems to carry their Transmitters )
Have a nice trip! Enjoy
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Old 03-14-2017, 03:19 AM   #20
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Uh, silly Paraptor, you seemed to have left out pressure gauge, on-board compressor, 50 feet of hose, hydraulic jack.....holy schmoly he should have bought a longer 5'ver!
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