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02-05-2016, 10:10 PM
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#1
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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LT vs ST tires good read
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02-05-2016, 10:41 PM
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#2
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Senior Member
Join Date: Jul 2009
Location: Warsaw,NC
Posts: 7,184
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I'm very glad I have the G614 on my Cedar Creek, I met Mark Polk one time I don't have much respect for him
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02-05-2016, 10:57 PM
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#3
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Senior Member
Join Date: Dec 2015
Location: Eastern NC
Posts: 3,963
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Quote:
Originally Posted by TURBS
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Good info. Sadly there are few choices and I'm not aware of any US made ST tire. There may be a huge market if a company would begin. My new 5er came with Trailer King ST load range E tires and will be changed at 4000 miles. I read recently of Power Max just being changed after 30,000. Agree with the article no matter what you run they must be taken care of or will not last. Who knows how the delivery guy took care of them in 1200 miles from the factory in IN?
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02-05-2016, 11:41 PM
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#4
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Senior Member
Join Date: Oct 2013
Posts: 638
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Didn't learn much from this..I have Michelin XPS Ribs on my rig. They are rated for much more than my actual axle weights. (Had it weighed) They have been an excellent tire for my purposes. I have around 30,00 trouble free miles on them. I will never consider a ST tire.
__________________
2015 Chev Silverado 3500 dually D/A
2016 Cedar Creek 36CK
B&W Patriot 18K, Trail-Aire pinbox,
Level up, dual panes & all that stuff...
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02-06-2016, 12:03 AM
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#5
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Senior Member
Join Date: Nov 2015
Posts: 4,223
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Quote:
Originally Posted by CaptnJohn
Good info. Sadly there are few choices and I'm not aware of any US made ST tire. There may be a huge market if a company would begin. My new 5er came with Trailer King ST tires and will be changed at 4000 miles. I read recently of Power Max just being changed after 30,000. Agree with the article no matter what you run they must be taken care of or will not last. Who knows how the delivery guy took care of them in 1200 miles from the factory in IN?
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That's a big IF and unless you were there to check the tire pressure when the unit first rolled in at delivery you really don't know if or how the tires were abused.
Think about this...a Goodyear or Michelin tire installed on a biz jet is required to be replaced if it has one landing with a pressure found to be 20 percent low. Even worse, if the tire is 30 percent low and it's on a dual wheel/tire setup (about 90 percent of them are) then BOTH tires must be replaced. This is true even if the tires are brand new and only used one time.
Most of these tires have a normal inflation of 170-220 psi, so 20 percent is a lot of air. But, if we apply the 20 percent factor to a trailer tire rating of 65-80 psi you'll see there could be damage if the tire is operated 12-16 psi on the low side. That's a little extreme bit of caution and, unfortunately, the tire makers won't tell us the minimum limits. But, I guarantee you that if I check my tire pressure at the end of the day (I do) and find an 80 psi tire was used at 50 psi that day then it's coming off to be replaced with a new one.
__________________
BIRDS AREN’T REAL
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02-06-2016, 12:16 AM
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#6
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Senior Member
Join Date: Jan 2016
Location: Phoenix, Arizona
Posts: 306
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I had a 30 foot toy hauler and had nothing but problems with the 15' ST tires. I changed to 16" LT load rated "E" and no more problems. Luckily I had discount tire certs or I would have been broke. I would jack up each axle and look for tread wobble before every trip to the dunes. As soon as I found it I would take it back and they would remount a new tire. I never had one that lasted over a year. I never had a blowout either AND I never found an ST tire made in USA.
I run a car tire on the rear of my Goldwing too...
...who says you have to play by the rules?
__________________
2016 Forester 2401WS MBS
Life is short...eat the cookie
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02-06-2016, 08:29 AM
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#7
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Senior Member
Join Date: Aug 2015
Location: Southern Illinois
Posts: 177
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Thanks for the post Turbs. Some good information to digest.
I know everyone wants to have safe durable tires and all problems can't be blamed on Chinese built tires. I know I've been guilty of not always watching how the extra weight I add was distributed over the axles and between the truck and trailer. It does make a difference.
__________________
Steve and Kim
Southern Illinois
2021 Cedar Creek 311RL
2020 F350 SRW Crew Cab
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02-06-2016, 08:32 AM
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#8
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Always Learning
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,891
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Quote:
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Light Truck tires are not always the same size, and do not always have the same load carrying capacity as ST tires. Depending on your trailer’s axle weight rating the tire load capacity might be 3420# @ 80 psi for example. The Michelin XPS RIB LT235/85R16E tire load capacity is 3,042# @ 80 psi. If you switch to LT tires for trailer applications the tire inflation pressure and/or the size of the tires would need to be capable of matching the load capacities of the trailer. If the size of the tire is increased to compensate for load capacities there needs to be sufficient clearance for the larger tires. Cost can be prohibitive too when you not only consider purchasing new tires but larger wheels for the tires to go on.
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This is the paragraph that everyone who considers the switch needs to be aware of. LT tires typically have a lower carrying capacity than the equivalent ST tire. If you're doing a straight switch, you have to ensure that the new tire has enough carrying capacity for your application.
Otherwise, the fact that there are RV manufacturers that use LT tires straight from the factory should be enough to squelch any debate on the topic. Each person should use the tire that they feel most comfortable with AND has the load carrying capability for their situation.
__________________
Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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02-06-2016, 09:51 AM
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#9
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Senior Member
Join Date: Nov 2014
Posts: 1,179
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Do they really?
ST tires are load and speed rated to only 65 MPH
LT tires generally are speed and load rated at 99 MPH.
Which is better?
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02-06-2016, 11:07 AM
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#10
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Left Coast
Join Date: Dec 2014
Location: vancouver,washington
Posts: 15,649
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ST tires on here are rated for 85.....
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02-06-2016, 11:13 AM
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#11
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Quote:
Originally Posted by bob caldwell
ST tires on here are rated for 85.....
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You read it upside down they are rated for 58 Bob... 
__________________
Coachmen M/H
Concord
2018 / 300 DSC
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02-06-2016, 12:17 PM
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#12
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Left Coast
Join Date: Dec 2014
Location: vancouver,washington
Posts: 15,649
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I must of been behind tire look'n over the top......
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02-06-2016, 12:24 PM
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#13
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Senior Member
Join Date: Sep 2012
Location: Virginia
Posts: 9,934
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Lts are nice idea maybe, but if you have no reputable tire dealers in your area that will install LTs on a trailer its a moot point. 
__________________
2005 Dodge 3500 Cummins
2017 Wildwood Lodge 4092 BFL
1966 Mustang GT
1986 Mustang SVO
Lillie Spoiled Rotten Boxer Mix
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02-06-2016, 01:34 PM
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#14
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Senior Member
Join Date: Feb 2011
Location: Evansville, Indiana
Posts: 221
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Great article - Thanks.
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02-06-2016, 01:37 PM
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#15
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Junior Member
Join Date: Jun 2015
Location: Rockford, Illinois
Posts: 16
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Quote:
Originally Posted by TURBS
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Turbs,
Thanks for sharing this article with us!
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02-06-2016, 02:05 PM
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#16
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Senior Member
Join Date: Mar 2013
Location: White Rock BC
Posts: 415
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Quote:
Originally Posted by TURBS
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Great article . Thanks for sharing !
__________________
Floyd & Carolyn
2012 F150 S/crew 4X4 6.2L 6Spd Tow Max Firestone airbags. 2011 28RKS Wildcat. Yamaha 3000iseb Gen.
2014 57 nights.2015 116 nights .2016 96 nights .2017 72 nights. 2018 157 nights. 2019 52nights.2020/21 118 nights. 2022 115nights 
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02-06-2016, 03:14 PM
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#17
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Member
Join Date: Mar 2015
Posts: 64
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I will stick with what the tire manufacturer recommends.
Quote from Goodyear web page.
"Trailer tires are considered a special category in the current global design standards of Tire and Rim. The major difference is that trailer tires are required to carry 10% more load than an equivalent P-metric size tire. LT type tires are actually on a lower formula and would require a significant size or load change to meet the trailer load requirements.
In the design process, we evaluate what works best under trailer applications/conditions. We typically find that a narrower tread width and a shallower non-skid (tread depth) provides a better overall performance in a free rolling position. This is one case where wider is not better. There are significant design differences with these tires and this explains why trailer tires are in a special category. In addition, that is why we recommend using trailer designed or trailer specific tires in trailer towable applications."
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02-06-2016, 04:23 PM
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#18
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Senior Member
Join Date: Jul 2013
Posts: 1,839
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Quote:
Originally Posted by spock123
I'm very glad I have the G614 on my Cedar Creek, I met Mark Polk one time I don't have much respect for him
Sent from my iPhone using Forest River Forums
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If you check the sidewalls on your G614 tires I'm pretty sure you're going to find a statement that says they are for trailer service only. IMO that makes them a trailer tire. (Very expensive trailer tire for low mileage users).
Lots of users are putting them on 6" wide rims when they are clearly for 6.5" wide rims. Sooner or later a catastrophic failure will happen and an inappropriate rim size will be involved. My advice about that is, get it in writing if the "tire guy" says it's ok and you decide to go along with him/her. Beads on high pressure steel cased tires require more precise seating parameters.
__________________
A Trailer Tire Poster
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02-06-2016, 04:26 PM
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#19
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Senior Member
Join Date: Jul 2013
Posts: 1,839
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The TRA has established a new maximum speed rating of 81 MPH for ST tires. All new ST tires will have a speed letter on their sidewall.
__________________
A Trailer Tire Poster
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02-06-2016, 05:45 PM
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#20
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Senior Member
Join Date: Jul 2009
Location: Warsaw,NC
Posts: 7,184
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Quote:
Originally Posted by Airdale
If you check the sidewalls on your G614 tires I'm pretty sure you're going to find a statement that says they are for trailer service only. IMO that makes them a trailer tire. (Very expensive trailer tire for low mileage users).
Lots of users are putting them on 6" wide rims when they are clearly for 6.5" wide rims. Sooner or later a catastrophic failure will happen and an inappropriate rim size will be involved. My advice about that is, get it in writing if the "tire guy" says it's ok and you decide to go along with him/her. Beads on high pressure steel cased tires require more precise seating parameters.
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My G614 came on the trailer from the factory. I guess you would have to call Cedar Creek on this one. I guess they are just stupid for installing the G614 on this camper.
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