Reply
 
Thread Tools Display Modes
 
Old 12-10-2015, 05:18 PM   #1
Mini-Skoolie
 
Join Date: Sep 2015
Location: Fort Worth, TX
Posts: 11
Year: 1991
Coachwork: Thomas
Chassis: 3700
Engine: Navistar 7.3 idi
Rated Cap: 30-ish?
Question Tire size questions

Hello, all!
I have a 1991 IH Thomas shorty. On the plate it says the stock tires were 9r 22.5. When I bought it, it has 10r 22.5's on it. The question I have is would it be bad to go to 297/75 22.5? From what I've read, the OD is the same, at 40.2" I've heard the terms low profile and high profile when referring to the tires, but I'm not sure if it would change handling, or anything like that. I know that going to a taller tire would give a higher than accurate groundspeed indication, while lowering rpm's slightly. Any downside?
Thank you!
bicyclerepairman is offline   Reply With Quote
Old 12-10-2015, 06:15 PM   #2
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 6,165
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
As long as the radius/diameter are the same there will be no difference in speed vs RPM but you can play with the numbers here...

Engine RPM Calculator
Tango is offline   Reply With Quote
Old 12-10-2015, 09:05 PM   #3
Mini-Skoolie
 
Join Date: Sep 2015
Location: Fort Worth, TX
Posts: 11
Year: 1991
Coachwork: Thomas
Chassis: 3700
Engine: Navistar 7.3 idi
Rated Cap: 30-ish?
Thank you, Tango.
So no downside to going to a low profile? Would there be any difference in ride quality? The only reason I'm considering it, is that that the newer standard tires are noticeably less expensive than the 10r.
bicyclerepairman is offline   Reply With Quote
Old 12-10-2015, 09:11 PM   #4
Bus Crazy
 
opus's Avatar
 
Join Date: May 2010
Location: Montana
Posts: 1,615
Year: 1995
Coachwork: Blue Bird
Chassis: All-American R/E
Engine: 8.3 Cummins
Rated Cap: 72
Low profile tires ride awful....cars and trucks.
opus is offline   Reply With Quote
Old 12-10-2015, 09:26 PM   #5
Mini-Skoolie
 
Join Date: Sep 2015
Location: Fort Worth, TX
Posts: 11
Year: 1991
Coachwork: Thomas
Chassis: 3700
Engine: Navistar 7.3 idi
Rated Cap: 30-ish?
Thank you, Opus.
Yeah, i knew they did in smaller tires, wasn't sure how noticeable it would be at this size.
bicyclerepairman is offline   Reply With Quote
Old 12-11-2015, 07:30 AM   #6
Bus Nut
 
austin1989us's Avatar
 
Join Date: Apr 2015
Location: Tomball, TX
Posts: 313
Year: 1988
Coachwork: Blue Bird
Chassis: TC/2000
Engine: Cummins 5.9TA
The low profile tires may have lower rolling resistance, so there may be a minor benefit to fuel economy.

The low profile tires may not have the same load rating as a regular tire, so you might wanna double check your weights to see if you're close.
austin1989us is offline   Reply With Quote
Old 12-11-2015, 04:56 PM   #7
Bus Nut
 
CaptSquid's Avatar
 
Join Date: Nov 2015
Location: Billings, MT
Posts: 914
Year: 2003
Coachwork: Thomas
Chassis: HDX
Engine: Cat C7
Rated Cap: 84 passenger
Gonna get some dubs with spinners to go with those lo-pro tires? How about some hydraulics, while you're at it? Make one heckuva low rider!
CaptSquid is offline   Reply With Quote
Reply

Thread Tools
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


» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 11:08 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.