Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 03-22-2012, 10:52 PM   #1
Senior Member
Join Date: Jul 2011
Posts: 133
Tire decision Goodyear G670 or G645 Any difference?

I need to replace the front tires on my 2005 34 foot Natioinal Seabreeze (F53) Tire size 245/70/R19.50 and am confussed. It has G670s now but the tire dealer is recommending G647s. The discussions here are very confussing about them being the same or different. QUSTION: Are G647's ok or not? Also load range is "F" on some of the current tires and "G" on others. Is that revelant?

Please help clear up the confusion.

John Stott is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 03-23-2012, 08:07 AM   #2
Moderator Emeritus
Mike Canter's Avatar

Join Date: Apr 2008
Location: Freeport, ME
Posts: 4,707
John are you replacing the front tires because of age or because of unusual wera pattern on the second tread in from the edges (rivering)? If it is just age and no unusual wear then stick with what has worked for you. If it is because of the unsual wear pattern then you might want to switch to the G645s. It appears that a lot of RVers are using the G645's.

As far as Load Range F or G that is the max weight carrying capability of the tire and usuasually measn that G will also have more plys than F. Look on your DECAL inside the motorhome or in the owners manual and see what Load Range tire is required on your MH. If it states Load Range G required then do not use Load range F. If it states that Load Range F required then you can safely use Load Range G. If you switch from F to G then you need to go up online and find the Load/Inflation Tables for that tire and make sure you run the correct pressure for that tire. That DECAL inside the motohome should help you because it gives the max loading on each axle and you can use that weight to get the correct tire pressures. My recommendation is to weigh the MH and use actual weight plus 10%. Becareful on having a tire sealer tell you off the top of his head what tire pressures you should be running. Look it up on the Goodyear factory charts. When you decide which tire and everything then this forum can help you get the correct tire pressures.

The Load Range G may ride a little harder than a Load Range F.

Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
Mike Canter is offline   Reply With Quote
Old 03-23-2012, 08:29 PM   #3
Junior Member
Join Date: Mar 2012
Posts: 14
I don't know if this is relevant or not. My RF tire has an uneven wear pattern. MH has about 34,000 on the odometer. There are no RV shops in Central Mexico. A mechanic from GM is saying that I probably need new front shocks. This guy had 30+ years with GM in TN before moving back to Mexico and hasn't lead me astray yet. If what he is saying is true, then you might want to have your shop check the shocks. BTW it does handle funky on bumpy roads which are numerous in Mexico.
bibarnes is offline   Reply With Quote
Old 03-24-2012, 07:31 PM   #4
Senior Member
xctraveler's Avatar
Tiffin Owners Club
Freightliner Owners Club
Join Date: Jun 2004
Location: Aguanga CA Jojoba Hills SKP Resort
Posts: 332
I was getting lousy wear pattern on LF Steer tire and when I had it in for alignment with brand new tires the mechanic found the wheel bearing was loose. Hope that resolved it. No sign of unbalanced wear 8,600 miles later.
Paul Rocking down the road in our '12 Phaeton 36QSH, (in service May 2012 ) We tow an '11 4 dr Jeep Wrangler Unlimited Rubicon - Read my blog at goldberg-online.net AKA RVM86
xctraveler is offline   Reply With Quote

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
Leveling with slide out - in or out capsfloyd Travel Trailer Discussion 30 05-27-2015 03:06 PM
TST 507 Tire Pressure Monitoring System lostagain Gear and Product Discussions 26 05-08-2012 07:30 PM
Tire balancing lwc1 Monaco Owner's Forum 17 03-22-2012 08:39 PM
Dog House or RV Hump question Darlene77 iRV2.com General Discussion 4 03-22-2012 07:14 PM
Onan 7500 problem or something else? 1ciderdog MH-General Discussions & Problems 7 03-22-2012 04:47 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:26 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.