Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 

Go Back   Montana Owners Club - Keystone Montana 5th Wheel Forum > GENERAL DISCUSSIONS > General Discussions about our Montanas
Click Here to Login

 
 
Thread Tools Search this Thread Display Modes
 
Prev Previous Post   Next Post Next
Old 10-04-2008, 07:15 AM   #31
KathyandDave
Montana Master
 
Join Date: Aug 2008
Location: Shelburne
Posts: 688
M.O.C. #8693
Send a message via MSN to KathyandDave
This turned out to be lengthy, so grab a coffee...
I'm trying to figure out the optimal inflation pressures for the TV and the trailer. We know that we are not at the maximum rating for the duallies. It's a challenge! So, after much searching...Eureka, I've got it!

For the TV, we have General Ameritrac tires LT215/85R16E. The General website gives no info, except maximums. The plaque on the TV door says that, for the rear axle, the maximum cold pressure is 65lbs., the rated maximum load is 3720kg (8200lbs). Our weighed rear axle with trailer = 3300kg (weighed on an Ontario MTO scale when the officers were not present) = 7273lbs, so each of four tires of duallies = 1818lbs. In the Goodyear http://www.goodyear.com/truck/pdf/pr...Brochure_P.pdf, we find the line for the Goodyear equivalent of our tires and we see that the recommended inflation pressure is between 50 and 55 lbs. A similar exercise for the trailer tires and the TV front tires.

To inflate to the maximum would mean that we are over-inflated, resulting in many deficiencies, including poor traction.

Can I safely transfer Goodyear data to General tires? I think my next tires will be Goodyear or other manufacturer who offers good engineering info!

Places to look at tire info: Tirerack.com (many clear articles), Wikipedia (shows entire load index table and lots more), carbibles.com/tyre_bible.html

One thing that the tyre bible guy emphasizes and other material (including MOC tire guide) hints at is that you MUST replace your tires every five or six years, no matter what, because the rubber compound deteriorates with time, not with usage. When buying a tire, look at its DOT manufacture date number. Some tire shops keep stock on the shelf until it sells, so you may be buying a tire that is already past its stale date!

Cold pressure is measured at 65 degrees F. Offset +1 PSI per 10 degrees colder. There's a rule of thumb for temperate climates to offset -2 PSI for reading in the afternoon, -4 for recent driving, -6 for recent long-haul driving. Do this agree with what the Pressure Pro and other units show?
KathyandDave is offline   Reply With Quote
 

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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tire pressure Keith Schweizer TIRES, Montana Tires 17 09-18-2013 04:56 PM
Tire Pressure Monitor (not pressure pro) bncinwv Tow Vehicles & Towing 18 02-15-2008 01:59 PM
Dually Rear Tire Pressure and Pressure Pro?? traveljunkie Tow Vehicles & Towing 9 08-16-2007 05:05 AM
Tire Pressure Rudi and Ellen Tow Vehicles & Towing 37 09-11-2006 05:56 PM
RV Tire Pressure BandJ Montana Problems, Problem Solving & Technical Help 0 01-11-2003 01:37 PM

» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Montana RV, Keystone RV Company or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 10:29 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.