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Old 04-25-2024, 01:20 AM   #1
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Join Date: Aug 2023
Posts: 6
Tire Talk

I have an International 3800 with a Bluebird body.
The 255/70R22.5 are ready to be replaced, and the wheels have enough rust I am replacing them rather than spending hours cleaning them up just to learn I need to replace one or more anyway.
I am looking at what my options are. This is a manual transmission bus that could drive straight up a cliff no problem, but highway cruising speed for optimal fuel mileage is about 52 mph. I want to go to a taller tire to trade a little bit of that torque for a higher top speed. I was wondering if anyone has played around with tire size on their bus.

Body modification to allow for a taller tire is within my skill set. I have been offered a set of 11R22.5 at a very good price, I am waiting on the model number so I can research if it is rated for my weight. I am also considering 295/75r22.5 and 315/80r22.5
I am leaning towards the 295/75 because it's a standard 18 wheeler size and it would be easiest to find a replacement if (when) a tire goes out on the road. Some huge honking 455 super singles would be the most amazing redneck investment, but I am not spending 800 a wheel and 450 a tire to ratt fink a bus. Doesn't mean I haven't day dreamed.

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Old 04-25-2024, 11:50 AM   #2
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Join Date: Jun 2023
Location: South Carolina
Posts: 964
Year: 1995
Coachwork: Thomas
Chassis: International 3800
Engine: T444E
Rated Cap: 29
I think having a readily available tire size is a good idea. You have to consider the time lost in waiting for an available tire into ones calculations of cost.
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Old 04-25-2024, 12:39 PM   #3
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Location: Columbus Ohio
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Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
11R22.5 is also a really common truck size.. the 295/75 is closer to a '10R22.5" in size.. slightly lower profile than an 11R.. i went form 10R to 11R in my DEV bus and it netted me about 3 MPH on top speed or at 60-62 about 100-150 RPM difference..
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Old 04-25-2024, 06:04 PM   #4
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Join Date: Sep 2015
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Year: 1992
Coachwork: Bluebird Mini-Bird 24'
Chassis: Chevy P30
Engine: Chevy 6.2L Diesel
Originally Posted by nikitis View Post
I think having a readily available tire size is a good idea. You have to consider the time lost in waiting for an available tire into ones calculations of cost.

This, so much.

My ranger had a weird hybrid size used by compact pickups and a couple of foreign SUVs, but the first time I needed to put some tires on it I went up to a 235/75Rwhatever it had. The 235s are used by basically every full-size truck and American SUVs, so I've never seen a shop that carried tires that didn't have a selection of them. It also turned out that I was able to save something like $25/tire while getting much better equipment.

Sure, my speedo is a bit off, but I'm still in the ballpark.

This is also why I'm using the 255/70R22.5 tires on my skoolie, they're common for larger/heavier trucks, and there's always a selection, as well as being more 'affordable', despite being in the $150-$250 range per unit.
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Old 04-27-2024, 11:08 PM   #5
Join Date: Oct 2009
Posts: 63
Year: 1972
Coachwork: wayne
Chassis: international
Engine: 345
11R22.5 is probably the most common truck tire out there and they're plenty stout enough for a skoolie. You can find them in any truck tire place, no matter how small a town. Can't say the same for some of the metric 22.5s.
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