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08-31-2015, 02:23 PM
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#1
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Member
Join Date: Jan 2015
Location: Shreveport LA
Posts: 99
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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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08-31-2015, 02:27 PM
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#2
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Senior Member
Ford Super Duty Owner
Join Date: Aug 2012
Location: costa rica / river ranch fl.
Posts: 977
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wanting to known also
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08-31-2015, 02:55 PM
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#3
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Senior Member
Workhorse Chassis Owner
Join Date: Jun 2003
Location: Palisade CO
Posts: 3,588
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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)
__________________
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
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08-31-2015, 03:02 PM
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#4
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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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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08-31-2015, 03:05 PM
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#5
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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Quote:
Originally Posted by Clay L
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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mine works well with the speedo off....82 mph up baker grade , could have went 85...
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08-31-2015, 03:09 PM
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#6
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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Quote:
Originally Posted by Steeler34
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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you are talking each at 500??
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08-31-2015, 03:19 PM
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#7
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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going down the 101 so-cal... santa monica
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08-31-2015, 03:56 PM
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#8
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Member
Join Date: Jan 2015
Location: Shreveport LA
Posts: 99
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Quote:
Originally Posted by LVRVLUVR
you are talking each at 500??
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Yes, 400-500 per wheel.
That is for the aluminum, I am fine with steel and a chrome cover.
Milton
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08-31-2015, 03:58 PM
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#9
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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Quote:
Originally Posted by Steeler34
Yes, 400-500 per wheel.
That is for the aluminum, I am fine with steel and a chrome cover.
Milton
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so you are getting steel???? where???
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08-31-2015, 04:01 PM
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#10
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Member
Join Date: Jan 2015
Location: Shreveport LA
Posts: 99
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Quote:
Originally Posted by Clay L
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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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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08-31-2015, 04:08 PM
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#11
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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Quote:
Originally Posted by Steeler34
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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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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08-31-2015, 04:24 PM
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#12
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Senior Member
Join Date: Jan 2013
Posts: 565
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Quote:
Originally Posted by LVRVLUVR
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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Well why don't you just go ahead and tell him where you got yours?
__________________
Dan
2014 Berkshire 390RB
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08-31-2015, 04:28 PM
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#13
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Senior Member
Join Date: Sep 2012
Posts: 8,055
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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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08-31-2015, 04:34 PM
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#14
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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Quote:
Originally Posted by nothermark
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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__________________
2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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