Tires & speed - Fiberglass RV


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-25-2012, 11:27 AM   #1
Senior Member
 
Name: Gene
Trailer: Scamp
North Dakota
Posts: 632
Registry
Tires & speed

A while back on this or one of the Casita forums there was some mention that the 13" tires on FG campers have a 65 MPH max rating. I can't find that written on mine anywhere. Does anyone have any info on that? I don't plan on going over 65 anyway just to get better mileage but am wondering limitations there really are.
__________________

__________________
Gene Masse is offline   Reply With Quote
Old 07-25-2012, 11:46 AM   #2
Senior Member
 
Carol H's Avatar
 
Name: Carol
Trailer: 22' Airstream Formerly 16' Scamp
British Columbia
Posts: 11,731
Registry
If the tires are marked ST then they are only rated to 65 mph.
__________________

Carol H is offline   Reply With Quote
Old 07-25-2012, 12:32 PM   #3
Senior Member
 
Name: Gene
Trailer: Scamp
North Dakota
Posts: 632
Registry
To my knowledge the ST is what designates them as trailer tires. "Special Trailer" or something like that. Nothing to do with speed.
This web site has some info but I wasn't sure how to interpret it. I called them and was told the "H" on another spot on the tire says 89MPH, but there was another letter there that confused the person I was talking to.
It's hard to believe that these tires wouldn't be rated faster than 65 considering today's speed limits.

Tire Tech Information - How to Read Speed Rating, Load Index & Service Descriptions
__________________
Gene Masse is offline   Reply With Quote
Old 07-25-2012, 12:40 PM   #4
Senior Member
 
Carol H's Avatar
 
Name: Carol
Trailer: 22' Airstream Formerly 16' Scamp
British Columbia
Posts: 11,731
Registry
Here you go Gene.

Quote "All "ST" tires have a maximum speed rating of 65 mph."
Carol H is offline   Reply With Quote
Old 07-25-2012, 04:06 PM   #5
Commercial Member
 
baron100's Avatar
 
Name: Rob
Trailer: Casita
Kansas
Posts: 81
Registry
Both Maxxis and Goodyear have indicated to me that ST tires can be inflated an additional 10 psi to accommodate speeds up to 75 mph. There are certain important caveats that apply

I am not advocating to the forum that everyone should do this. RV safety studies have indicated that trailers are often overloaded for the load range tires they are using or under inflated. Increase in speed over 65 mph in these conditions is a recipe for disaster.

A Goodyear Service Bulletin is attached.


http://casitaadventures.smugmug.com/...T1-Large-L.jpg

http://casitaadventures.smugmug.com/...t2-Large-L.jpg
__________________
Rob
http://casitaadventures.smugmug.com/
baron100 is offline   Reply With Quote
Old 07-25-2012, 07:27 PM   #6
Senior Member
 
Donna D.'s Avatar
 
Name: Donna D
Trailer: Escape 5.0 TA, 2014
Oregon
Posts: 24,433
Frankly, I travel at the speed where I get the best fuel mileage considering tug/tow/environmental conditions. For my combination that's usually 57 mph. I have NO desire to get somewhere fast, where it costs me $$ in fuel (and stress). My trailer is traveling on ST205/75 R15 Marathons inflated to 50 PSI. YMMV
__________________
Donna D.
Ten Forward - 2014 Escape 5.0 TA
Double Yolk - 1988 16' Scamp Deluxe
Donna D. is online now   Reply With Quote
Old 07-25-2012, 08:05 PM   #7
Commercial Member
 
baron100's Avatar
 
Name: Rob
Trailer: Casita
Kansas
Posts: 81
Registry
Quote:
Originally Posted by Donna D. View Post
Frankly, I travel at the speed where I get the best fuel mileage considering tug/tow/environmental conditions. For my combination that's usually 57 mph. I have NO desire to get somewhere fast, where it costs me $$ in fuel (and stress). My trailer is traveling on ST205/75 R15 Marathons inflated to 50 PSI. YMMV
Donna, I am not Frankly, but that is a very wise speed philosophy.
__________________
Rob
http://casitaadventures.smugmug.com/
baron100 is offline   Reply With Quote
Old 07-25-2012, 10:20 PM   #8
Senior Member
 
Donna D.'s Avatar
 
Name: Donna D
Trailer: Escape 5.0 TA, 2014
Oregon
Posts: 24,433
Rob, there's a bunch of "Frankly's" that hang out here... and aren't we glad Make a great memory every single time you pull your all molded towable someplace
__________________
Donna D.
Ten Forward - 2014 Escape 5.0 TA
Double Yolk - 1988 16' Scamp Deluxe
Donna D. is online now   Reply With Quote
Old 07-27-2012, 08:56 AM   #9
Member
 
Name: Michael
Trailer: Bigfoot 25B25RQ
BC
Posts: 92
Quote:
Originally Posted by Donna D. View Post
Frankly, I travel at the speed where I get the best fuel mileage considering tug/tow/environmental conditions.
Agreed Donna.

[/QUOTE]My trailer is traveling on ST205/75 R15 Marathons inflated to 50 PSI. YMMV[/QUOTE]

I am confused. I just finished writing in another response that I run at 35 psi and I have the same tires as you have. The trailer manufacturer recommends this and the tread wear is 80% remaining after 5 years so I'm under the assumption 35psi working for me.

May I ask why 50 psi?
__________________
mike_bc is offline   Reply With Quote
Old 07-27-2012, 10:38 AM   #10
Senior Member
 
Carol H's Avatar
 
Name: Carol
Trailer: 22' Airstream Formerly 16' Scamp
British Columbia
Posts: 11,731
Registry
Quote:
Originally Posted by mike_bc View Post
Agreed Donna.
Quote:
Originally Posted by Donna D. View Post
My trailer is traveling on ST205/75 R15 Marathons inflated to 50 PSI. YMMV
Quote:
Originally Posted by mike_bc View Post
I am confused. I just finished writing in another response that I run at 35 psi and I have the same tires as you have. The trailer manufacturer recommends this and the tread wear is 80% remaining after 5 years so I'm under the assumption 35psi working for me.

May I ask why 50 psi?

Mike I am not Donna, but you need to keep in mind that that the trailer manufacture doesnt actually make the tires. Whats more important is what the tire manufacture says I also inflate to the max 50 PSI. The general guidelines given regarding trailer tires is that you need to inflate trailer tires to their max psi when cold as that is the only way to get them to their max load rating. I believe the max load rating on the tires in question is 1,820 @ 50psi. So if trailer is close to that weight on an any of its axles it needs to be inflated to that.

My old Scamp had a sticker above the wheels that said not to inflate tires over ex so many PSI as well..... when I first got the trailer I changed the tires and the guys at the tire store took the sticker off after asking me what the trailer actually weighed loaded and said that it was dangerous for Scamp to put such a sticker on the trailer.
Carol H is offline   Reply With Quote
Old 07-27-2012, 10:53 AM   #11
Senior Member
 
floyd's Avatar
 
Name: Floyd
Trailer: 2004 13 ft Scamp Custom Deluxe
IllAnnoy
Posts: 6,046
Registry
Quote:
My trailer is traveling on ST205/75 R15 Marathons inflated to 50 PSI. YMMV
Quote:
I am confused. I just finished writing in another response that I run at 35 psi and I have the same tires as you have. The trailer manufacturer recommends this and the tread wear is 80% remaining after 5 years so I'm under the assumption 35psi working for me.

May I ask why 50 psi?
VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV

It must be.... especially if you plan to use the "Logan's Run" replacement plan.
Since you have used less than 2/32", you have not yet worn them to the point of best efficiency. The next 2/32" should wear even slower, but should also start to dispel some of your confusion.
Your trailer has two axles while the Scamp 16 has only one.This makes a difference eventhough your trailer is a bit on the "chubby" side.
__________________
floyd is offline   Reply With Quote
Old 07-27-2012, 11:11 AM   #12
Senior Member
 
Carol H's Avatar
 
Name: Carol
Trailer: 22' Airstream Formerly 16' Scamp
British Columbia
Posts: 11,731
Registry
Goodyear actually has a pretty good section re trailer tires on their website.
Carol H is offline   Reply With Quote
Old 07-27-2012, 01:48 PM   #13
Senior Member
 
Name: None
Trailer: None
None
Posts: 2,730
Tire pressure

When I purchased my Hankook RA08 tires for my 16 ft. Scamp, my tire dealer told me they had inflated my new tires to 65 Lbs PSI ( MAX air pressure) He told me that tires used on trailers should be run at max air pressure. Being a doubting soul, I called Hankook and asked them what pressure I should run the tires at and got the same answer " Max air pressure listed on the tire". I do not pretend to be a tire expert but I would believe a large tire retailer and the tire manufacturer should know something about tires
__________________
steve dunham is offline   Reply With Quote
Old 07-27-2012, 01:54 PM   #14
Moderator
 
Name: RogerDat
Trailer: 77 Scamp 13
Michigan
Posts: 3,080
Quote:
I am confused. I just finished writing in another response that I run at 35 psi and I have the same tires as you have. The trailer manufacturer recommends this and the tread wear is 80% remaining after 5 years so I'm under the assumption 35psi working for me.

May I ask why 50 psi?
Air pressure is a direct factor in the load rating of a tire. Same tire at different PSI can be rated at different load capacity. D load rated tire at 50 psi may only be a C rating at 35 psi.

Single axle having two tires to carry load, double axle has 4, given twice as many tires without twice the weight don't need the full load capacitiy of the tire.

Heat and age which break down the tire internally are what kills most camper tires, not tread wear. So many people run at max pressure manufacture states for the tire. Higher psi = less heat + greater bruise resistance from pot holes + stiffer sidewalls for less sway. At expense of somewhat stiffer ride for trailer.

Logans Run is reference to a sci-fi movie where everyone is killed at a certain age. Some people replace their tires at a certain age rather than based on tread.
__________________

__________________
RogerDat 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
Replacing my tires & rims... do they have to be trailer tires? David Scott Towing, Hitching, Axles and Running Gear 20 10-16-2012 08:25 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
3 Rims & Tires off my Boler ! John J. M Classified Archives 0 09-07-2009 06:37 PM
Boler Rims & Tires Jayson Wall Towing, Hitching, Axles and Running Gear 3 07-24-2008 07:53 PM
wheels & tires RJordanX2 Modifications, Alterations and Updates 5 04-15-2007 10:14 AM

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

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:56 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.