14" to 15" Tires - Fiberglass RV


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-14-2018, 11:44 AM   #1
Junior Member
 
Name: Joe
Trailer: In the market
Texas
Posts: 2
14" to 15" Tires

I'm wondering if 15" new tires are better than the 14" tires on my '03 Casita 17 SD? What are the pros/cons of 15" as opposed to the 14"s on now? I have the high-lift axel but would have to buy new wheels.

Any suggestions/recommendations are certainly appreciated. And thanks to all that respond.
__________________

1joedoug is offline   Reply With Quote
Old 02-14-2018, 12:26 PM   #2
Senior Member
 
Joe & Cherie's Avatar
 
Name: Joe
Trailer: 2013 EggCamper & 2011 Silverado Reg Cab 4x4
Ohio
Posts: 479
go for it

Its just my opinion, but I think its a great upgrade! Those 14" C rated are marginal for that Casita 17 SD weight. I like margin in my design - especially in tires. When we had a 17 Casita SD (and also our current EggCamper), I switched them out from 14's C rated to 225/75/R15 Maxxis M8008 D rated. I also upgraded to aluminun rims just for the bling, and dont forget the high pressure valve stems! Dont upgrade the tires/wheels and cheap out on weak valve stems. Just the piece of mind of that upgrade was worth it!

By the way - I see this is your first post - Welcome!!!
__________________

__________________
2013 EggCamper #120

Joe's EggCamper Journal
Joe & Cherie is offline   Reply With Quote
Old 02-14-2018, 12:41 PM   #3
Senior Member
 
Jon in AZ's Avatar
 
Name: Jon
Trailer: 2008 Scamp 13 S1
Arizona
Posts: 8,244
Registry
15's are much easier to find in stock if you need one in a hurry on the road somewhere, too.

And I'll second the welcome!
Jon in AZ is offline   Reply With Quote
Old 02-14-2018, 12:48 PM   #4
Senior Member
 
Name: Daniel A.
Trailer: Bigfoot 17.0 1991 dlx
British Columbia
Posts: 663
Registry
Timely post as I'm looking to change from 14" to 15" on my Bigfoot this spring I had a lift kit put in last fall for improved clearance and its time for new tires anyway.
Daniel A. is offline   Reply With Quote
Old 02-14-2018, 02:47 PM   #5
Member
 
Name: Glen
Trailer: trillium
Alberta
Posts: 63
Here's a thread about my conversion from 13" to 15" on a 2005 Trillium.

15 inch wheels

So glad i did it.

Cheers
Sparky0 is offline   Reply With Quote
Old 02-15-2018, 10:12 AM   #6
Senior Member
 
Name: Ed
Trailer: Casita 17 ft SD
Colorado
Posts: 111
The 14 inch tires are running at maximum capacity all the time.

The 15 inch tires can be purchased in a load range D which can carry a much higher load which in creases the durability and life span of the tires. Plus the bearings last longer because they are turning slower.
ehoepner is offline   Reply With Quote
Old 02-15-2018, 11:47 AM   #7
Junior Member
 
Name: William
Trailer: Eriba Touring Pan
Connecticut
Posts: 11
Being an old tire engineer I would like to make a comment. Tires marked ST (ST235/85R16) for trailer use are engineered and tested to a lower standard than tires marked Light Truck, LT (LT235/85R15) or passenger tires for that matter.

*Convince yourself of that fact by reading the words on the side of trailer tires "For Trailer Use Only". Since trailers do not carry passengers, the manufacturer of trailer tires has less liability when a tire fails than when a light truck or passenger tire fails.

Now look at that construction description on the sidewall. An LT tire will usually say, 3 tread plies, 2 steel 1 nylon. A radial ST tire will not have the nylon ply. The nylon cap ply is there to make sure that the tire stays together in case of a separation failure.

People talk about ST tires being more stable. Stability is a function of air pressure. More air is better. Right up to the maximum pressure listed on the sidewalk. In fact you can go even 5 psi more than the max listed because that higher pressure is recommended in the tables for vehicles traveling continuously at high speed.

Considering the above, it is always better to use an LT tire instead of an ST tire and LT tires are usually cheaper because they are made and sold in greater volumes.

For small trailers if you can't find a suitable LT tire, use a passenger tire instead of ST if you can find one that can carry the load.
wvorih is offline   Reply With Quote
Old 02-15-2018, 12:02 PM   #8
Senior Member
 
Glenn Baglo's Avatar
 
Name: Glenn ( second 'n' is silent )
Trailer: 2009 Escape 17B '08 RAV4 SPORT V6
British Columbia
Posts: 6,433
So, it's your theory William, that tire companies deliberately design an inferior tire and call it Special Trailer to deceive customers.
__________________
What happens to the hole when the cheese is gone?
- Bertolt Brecht
Glenn Baglo is online now   Reply With Quote
Old 02-15-2018, 12:58 PM   #9
Junior Member
 
Name: William
Trailer: Eriba Touring Pan
Connecticut
Posts: 11
Good comment Glenn. Manufactures in general try to serve their customers (trailer manufacturers in this case) with the lowest cost products that meet the customers requirements. Trailers do not carry people and so their tires can be made cheaper and do the job.
I illustrated this last point by mentioning the nylon cap ply that is now almost 100% used in passenger and light truck tires. This extra ply, over the 2 steel tread plies was implemented over the last 20 years to solve the problem of tires on the back axles having catastrophic failures and vehicle rollovers often due to under inflation. Remember those Ford Explorers and other SUVs rolling over? Now if the tire fails, it stays in one piece and the vehicle rarely rolls over.

In my experience the cheapest tire construction I ever saw was the high ply rating 14 inch bias tires used on mobile homes. The plies had a very thin coating of rubber and very thin tread depth. The trailers had a dozen wheels on each side so the risk of a vehicle problem from a blow out was low. And blowouts they had.
Another point of interest is that in Europe they drive a high speed even with trailers and the trailers use passenger tires that are speed rated.
Please let me know if you find an ST tire with a nylon ply over the steel belts. A sidewalk photo of the construction would be nice.
wvorih is offline   Reply With Quote
Old 02-15-2018, 03:16 PM   #10
Senior Member
 
Name: Lee
Trailer: Casita
Texas
Posts: 397
Registry
Wvorih
Thanks for the educational post. Heres a website that has a lot of useful info on tire sizes. https://tiresize.com/height-calculator/
__________________
Lee
Captleemo is offline   Reply With Quote
Old 02-15-2018, 03:27 PM   #11
Senior Member
 
Name: Joe
Trailer: 1999 Casita 17' SD
Ohio
Posts: 671
William.
Glad you approve of my new Good Year Endurance ST tires.
How about 2 plies of Nylon?
Here's a picture of my 205/75R15 D rated side wall you asked for
It says 2 Polyester + 2 Steel + 2 Nylon, N speed rating. (87 MPH)
https://www.goodyear.com/en-US/tires...ce/sizes-specs

They are made in the US
To the original poster, this is the size Casita is putting on new high axle trailers.
My "Bling" are Sendel T02 80 psi rated rims
Joe
Attached Thumbnails
.endurance.JPG   Wheel.JPG  

Joe Romas is offline   Reply With Quote
Old 02-15-2018, 04:56 PM   #12
Senior Member
 
Joe & Cherie's Avatar
 
Name: Joe
Trailer: 2013 EggCamper & 2011 Silverado Reg Cab 4x4
Ohio
Posts: 479
Quote:
Originally Posted by Joe Romas View Post
My "Bling" are Sendel T02 80 psi rated rims
Joe
Same wheels I have! I researched and most were much lower psi. These were the only ones that were 80psi! And they look good too!
Joe & Cherie is offline   Reply With Quote
Old 02-15-2018, 09:15 PM   #13
Senior Member
 
Tom Trostel's Avatar
 
Name: Tom
Trailer: 1980 Bigfoot 17 ft
Texas
Posts: 1,338
Registry
Send a message via AIM to Tom Trostel Send a message via MSN to Tom Trostel
If you wish to stay with 14", there are some better options than any ST. Mounted on my trailer are Maxxis Bravo UE-168 in size 185R14C. They have a load rating of 1874 lbs.@ 65 psi and a speed rating of R (106 mph). They are light truck tires with 2 polyester, 2 steel and 2 nylon belts. They are made in Taiwan. They can be had in size 205R14 with a load rating of 2270 lbs. I've been very happy with these tires. The main "con" is they can be difficult to find and buy. Amazon lists them.

https://www.amazon.com/MAXXIS-UE-168...70_&dpSrc=srch
__________________
1980 Bigfoot 17' & former owner of 1973 Compact Jr
Tom Trostel is offline   Reply With Quote
Old 02-15-2018, 09:28 PM   #14
Senior Member
 
Name: bob
Trailer: Was A-Liner now 13f Scamp
Missouri
Posts: 2,739
joe I like those rims


bob
k0wtz is offline   Reply With Quote
Old 02-15-2018, 10:05 PM   #15
Junior Member
 
Name: William
Trailer: Eriba Touring Pan
Connecticut
Posts: 11
Joe, Thanks for that photo and info on your tires. They sound like serious tires.
And look great on those rims!
wvorih is offline   Reply With Quote
Old 02-16-2018, 07:29 AM   #16
Junior Member
 
Name: William
Trailer: Eriba Touring Pan
Connecticut
Posts: 11
Tom, your tire, *185R14C, does not have the letters LT as a prefix because that size is a European size. For tires listed by the ETRTO, European Tyre and Rim Technical Organisation, the suffix "C" means commercial use including trucks and buses. The LT prefix is for metric sizes listed by TRA,
The Tire and Rim Association, Inc
Which is the USA tire standards organization. The two designations are for practicle purposes the same. I thought this little technical fact might be of interest. There are a few other tire sanctioning bodies but these two are the most important.
wvorih is offline   Reply With Quote
Old 02-16-2018, 07:34 AM   #17
Senior Member
 
Name: Joe
Trailer: 1999 Casita 17' SD
Ohio
Posts: 671
Quote:
Originally Posted by k0wtz View Post
joe I like those rims


bob
When they arrived I was very impressed by their weight and construction
According to what I could find they are only 0.3 pound lighter then steel rims.
My GY endurance 205/75R15 "D" tires are rated at 2150 pounds each at 65 PSI.

I talked to Sendel and these rims can be balanced both "hub centric" and "Lug centric" eliminating what can be a hassle. I got the tires at Discount tire and specified only stick on weights on the inside only period. The installer really didn't want to do it that way.
I shudder to think of them pounding on conventional weights on my brand new rims.
My 2017 GMC Sierra came from the factory that way
Joe Romas is offline   Reply With Quote
Old 02-16-2018, 12:06 PM   #18
Senior Member
 
Name: bob
Trailer: Was A-Liner now 13f Scamp
Missouri
Posts: 2,739
tire weights

I have owned cadilacs and lincolns it irratates me to no end to take the car in for either new tires or balancing come out after paying and see pound on weights on the outside of a 2k set of rims.

what are those guys thinking?

bob
k0wtz is offline   Reply With Quote
Old 02-16-2018, 12:52 PM   #19
Senior Member
 
Name: Joe
Trailer: 1999 Casita 17' SD
Ohio
Posts: 671
Bob

I stand outside the service door, out of the shop area and watch and am not afraid to let them know when I see them getting out the pound on weights

Joe
Joe Romas is offline   Reply With Quote
Old 02-16-2018, 01:51 PM   #20
Senior Member
 
Name: Lee
Trailer: Casita
Texas
Posts: 397
Registry
I bought a set of tires once at Discount Tire and I specified that the weights be on the inside of the rim. When they were done I noticed that the weights were on the outside of the rim so I complained to the manager and he had them re balance the tires as specified on the signed purchase agreement.
__________________

__________________
Lee
Captleemo is offline   Reply With Quote
Reply

Tags
tires


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
P185-80 tires OR ST185-80 Tires ericmarlo Towing, Hitching, Axles and Running Gear 19 12-30-2014 02:14 PM
13" Tires or/vs 15" Tires? Tony Rubi Problem Solving | Owners Helping Owners 9 10-31-2013 10:35 PM
Replacing my tires & rims... do they have to be trailer tires? David Scott Towing, Hitching, Axles and Running Gear 20 10-16-2012 07:25 PM
Tow vehicle with rear tires larger than front tires? Cory Lewis Towing, Hitching, Axles and Running Gear 2 02-15-2010 11:33 PM

» Upcoming Events
No events scheduled in
the next 465 days.
» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:36 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
×