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.
Reply
  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 08-16-2011, 08:01 AM   #1
Senior Member
 
Workhorse Chassis Owner
Join Date: Jan 2002
Posts: 1,333
Can I mix tire sizes ?

We use 245/75-22.5 tires. No on board mounted spare. I might be able to squeeze a spare in a compartment with a 10 inch high, pass-thru shelf.

Tire dealers tell me it is OK to drive on a 235/80 tire which might fit in the compartment shelf as it is a half-inch less wide.

I'll take the RV to tire stores and dry-fit before I buy. Mounted or un-mounted.

So.....if the smaller tire is installed on the rear, would there be a problem driving?
__________________

__________________
2003 Dolphin LX 6355 w/ W22 chassis; 8.1L gasser & Allison 1000
Scooter 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 08-16-2011, 08:25 AM   #2
Senior Member
 
Senior Chief's Avatar


 
Vintage RV Owners Club
Fleetwood Owners Club
Join Date: Jun 2009
Location: Somewhere in the woods in Belfair, WA, WA
Posts: 1,250
A smaller tire on rear will give an error on you speedometer. A smaller tire will give a reading higher than you are actually going. You'll have a bit more power, but probably not noticeable.
Other than that, no problems.
__________________

__________________
Life rocks when your house rolls
Senior Chief
& the Cheese Queen


Senior Chief is offline   Reply With Quote
Old 08-16-2011, 08:30 AM   #3
Senior Member
 
Senior Chief's Avatar


 
Vintage RV Owners Club
Fleetwood Owners Club
Join Date: Jun 2009
Location: Somewhere in the woods in Belfair, WA, WA
Posts: 1,250
I may have misunderstood. Are you talking about ONE smaller tire in rear? Bad, bad news.
Ok for a spare, but get it off ASAP!
__________________
Life rocks when your house rolls
Senior Chief
& the Cheese Queen


Senior Chief is offline   Reply With Quote
Old 08-16-2011, 08:36 AM   #4
Senior Member
 
Dave78Chief's Avatar
 
Join Date: Jun 2009
Posts: 1,513
You can run a "set" of smaller size tires on a given axle. You just do not want to mix different size tires on the same axle. You also do not want to mix bias and radial tires on the same axle. If you have an odd size spare, you can put it on to use to get to a service center to get the damaged tire fixed/replaced and remounted.

Dave
__________________
Dave78Chief is offline   Reply With Quote
Old 08-16-2011, 08:43 PM   #5
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,073
Matching two different size tires as dual pair is bad news unless they are very close in effective diameter (and therefore the identical circumference). If one tire in a dual pair is larger than the other, it carries most of the load for that pair and is effectively overloaded. It will self-destruct real soon.

The 235/80 is going to be 4.25 mm more in sidewall height (188mm vs 183.75) which means an extra 8.5mm in diameter. That's about 1/3". That also assumes that both have the same amountof wear. If the 245 had 25k mile son it, its tread would be worn down somewhat, making it that much more smaller than the 235/80 spare, which is probably brand new.

1/3" extra in diameter isn't too bad - I've read that up to 1/2" can be tolerated. However, I wouldn't want to risk driving very far on it.
__________________
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 08-16-2011, 10:02 PM   #6
Senior Member
 
PalmSprings's Avatar
 
Join Date: Sep 2010
Location: PalmSpringsSCalDesert
Posts: 165
First try this one as we exausted the topic I thinkl.
1/2 inch either way wasnt a problem. Ive RVd since 90 and have done this with no issues

How much difference is ok on rear R/L rear tire diameters?

In the search box type tire sizes and you will find lots of discussions about tire diameters mix and match.;
__________________
PalmSprings is offline   Reply With Quote
Old 08-17-2011, 06:14 AM   #7
Senior Member
 
randco's Avatar
 
Join Date: Jul 2008
Location: Sarasota, Florida
Posts: 604
Gary is prett much right on. The width of the 245/75 is roughly 9.65". The width of the 235/80 is 9.25". The 235/80 will be .33" (almost 21/64ths) taller than the 245/75.

I don't see any real problem using it as an "emergency spare".
__________________

__________________
2004 Damon Escaper 4076
randco is offline   Reply With Quote
Reply



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
New tire sizes OldChief7155 Winnebago Industries Owner's Forum 13 03-13-2016 05:15 PM
Tire sizes? jr3153 Travel Trailer Discussion 10 03-06-2011 12:51 PM
Changed Tire Myself! GaryKD Class A Motorhome Discussions 45 09-29-2009 10:37 PM
Follow-up to tire purchase and tire balancing Tagalong Winnebago Industries Owner's Forum 0 05-12-2009 10:15 AM
Look out for those fancy flexible tire filler hoses. Hansville MH-General Discussions & Problems 6 05-05-2009 02:32 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:20 AM.


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