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Old 08-31-2015, 03:23 PM   #1
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Changing from 19.5 to 22.5 wheels and tires

I have a 2009 Allegro 35QBA. Don't need tires yet, but when I do, wondering thoughts and opinions on moving from the 19.5 steel wheels to the 22.5 aluminum.

Wheels can be had for 4-500 bucks and the jump in tire price looks to be a couple hundred a piece.
I know I will need to re-cal the Speedo, but that is OK.
Hear the ride is better and wear is longer.

Milton
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Old 08-31-2015, 03:27 PM   #2
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Old 08-31-2015, 03:55 PM   #3
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I think more than re-calibrating the speedo may be needed. The speedo gets it info from the engine computer so the change will need to be done there. The Allison transmission also gets info there and shift points might be messed up.
When Workhorse changed from 19.5 to 22.5 size tires on a given chassis they appear to have also changed the rear axle ratio.
From a WH chassis spec chart:
Rear Axle Ratio
5.38 (22.5" Wheels)
4.88 (19.5" Wheels)
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Old 08-31-2015, 04:02 PM   #4
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I did mine...where do you think you will get the wheels????

mines only a 26'r
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Old 08-31-2015, 04:05 PM   #5
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Originally Posted by Clay L View Post
I think more than re-calibrating the speedo may be needed. The speedo gets it info from the engine computer so the change will need to be done there. The Allison transmission also gets info there and shift points might be messed up.
When Workhorse changed from 19.5 to 22.5 size tires on a given chassis they appear to have also changed the rear axle ratio.
From a WH chassis spec chart:
Rear Axle Ratio
5.38 (22.5" Wheels)
4.88 (19.5" Wheels)
mine works well with the speedo off....82 mph up baker grade , could have went 85...

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Old 08-31-2015, 04:09 PM   #6
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Originally Posted by Steeler34 View Post
I have a 2009 Allegro 35QBA. Don't need tires yet, but when I do, wondering thoughts and opinions on moving from the 19.5 steel wheels to the 22.5 aluminum.

Wheels can be had for 4-500 bucks and the jump in tire price looks to be a couple hundred a piece.
I know I will need to re-cal the Speedo, but that is OK.
Hear the ride is better and wear is longer.

Milton
you are talking each at 500??
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Old 08-31-2015, 04:19 PM   #7
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going down the 101 so-cal... santa monica


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Old 08-31-2015, 04:56 PM   #8
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you are talking each at 500??
Yes, 400-500 per wheel.

That is for the aluminum, I am fine with steel and a chrome cover.

Milton
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Old 08-31-2015, 04:58 PM   #9
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Yes, 400-500 per wheel.

That is for the aluminum, I am fine with steel and a chrome cover.

Milton
so you are getting steel???? where???
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Old 08-31-2015, 05:01 PM   #10
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Quote:
Originally Posted by Clay L View Post
I think more than re-calibrating the speedo may be needed. The speedo gets it info from the engine computer so the change will need to be done there. The Allison transmission also gets info there and shift points might be messed up.
When Workhorse changed from 19.5 to 22.5 size tires on a given chassis they appear to have also changed the rear axle ratio.
From a WH chassis spec chart:
Rear Axle Ratio
5.38 (22.5" Wheels)
4.88 (19.5" Wheels)
I did the power programmer mod and I think I can set the tune for the 22.5 in tires and wheels. It is also a Ford F53 chassis.

Milton
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Old 08-31-2015, 05:08 PM   #11
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I did the power programmer mod and I think I can set the tune for the 22.5 in tires and wheels. It is also a Ford F53 chassis.

Milton
what I'm try'n to say is no one makes those wheels....different bolt pattern... in other words... the 22.5s on the 22 and 26k won't bolt on..
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Old 08-31-2015, 05:24 PM   #12
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Originally Posted by LVRVLUVR View Post
what I'm try'n to say is no one makes those wheels....different bolt pattern... in other words... the 22.5s on the 22 and 26k won't bolt on..
Well why don't you just go ahead and tell him where you got yours?
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Old 08-31-2015, 05:28 PM   #13
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I'm trying to figure out why you would want to do it. You will gain flat ground efficiency, maybe. You will take a hit on hill climbing because you will be downshifting sooner to make up for the wrong gearing for the engine torque curve. You will also dump a couple of thousand dollars. Why???
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Old 08-31-2015, 05:34 PM   #14
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I'm trying to figure out why you would want to do it. You will gain flat ground efficiency, maybe. You will take a hit on hill climbing because you will be downshifting sooner to make up for the wrong gearing for the engine torque curve. You will also dump a couple of thousand dollars. Why???
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