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Old 12-10-2015, 04:18 PM   #1
Mini-Skoolie
 
Join Date: Sep 2015
Location: Fort Worth, TX
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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!

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Old 12-10-2015, 05:15 PM   #2
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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...

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Old 12-10-2015, 08:05 PM   #3
Mini-Skoolie
 
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Engine: Navistar 7.3 idi
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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.
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Old 12-10-2015, 08:11 PM   #4
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Low profile tires ride awful....cars and trucks.
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Old 12-10-2015, 08:26 PM   #5
Mini-Skoolie
 
Join Date: Sep 2015
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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.
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Old 12-11-2015, 06:30 AM   #6
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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.
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Old 12-11-2015, 03:56 PM   #7
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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!
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