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1999-2007 Upgrades and Aftermarket - General Upgrading or adding OEM or aftermarket equipment to your 1999-2007 Super Duty. Please confine discussion of topics in this forum to those items that are not engine-specific.

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Old 08-10-2008, 02:53 AM   #1 (permalink)
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Hi Guys,

It is me again and need more opinions. I like the look of the big rig wheels, 22.5", but was wondering how much it will effect the towing performance of my truck, 2005 F-350 dually, 4X4, 6.0. I pull a fifth wheel that weighs about 11,500# when loaded. I understand that the gear ratio will be somewhat changed due to the lareger tires. Can anyone offer some direction here?

Thanks!

DUAL350
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Old 08-12-2008, 11:28 AM   #2 (permalink)
 
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Originally Posted by DUAL350 View Post
Hi Guys,

It is me again and need more opinions. I like the look of the big rig wheels, 22.5", but was wondering how much it will effect the towing performance of my truck, 2005 F-350 dually, 4X4, 6.0. I pull a fifth wheel that weighs about 11,500# when loaded. I understand that the gear ratio will be somewhat changed due to the lareger tires. Can anyone offer some direction here?

Thanks!

DUAL350
We have several customers on 22.5 and 24.5 combos who pull considerable weight without issue. Most of the performance difference is due to the increased tire diameter. You could re-gear if you find that your EGTs are on the high side when towing. Here are a couple of examples:







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Old 08-13-2008, 05:16 PM   #3 (permalink)
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If you go to the size 255/70R22.5 in the Bridgestone R250F, then the tire diameter is 36.7". For comparison, the LT245/75R17 tires that are stock on your truck have a diameter of 31.5". The ratio of diameters is 1.165. I'm not sure what rear end ratio you have now, but for example, if it is 4.10, then divide that by 1.165 to get 3.52, which is the effective rear end ratio that you would have with the tire swap. Multiply 4.10 by 1.165 to get 4.78. That is the rear end ratio that you would need to change to in order to keep the same effective gearing after the tire swap. Of course, the fact that the bigger tires are heavier is going to slow you down a little also.

Sizes and Specifications

https://www.bfentirenet.com/product_...8&partial=true
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2001 F350 XLT 4X4 crew cab, dual rear wheels, long bed, black, 7.3l turbo diesel, automatic transmission, 4.10, shift on the fly, running boards, sliding rear window, 38 gal fuel tank, 11,500 gvwr, 20,000 gcwr, 7500 gvw, completely stock, 114,000 miles when purchased, now has 170,000 miles, repairs so far: starter, batteries, cps, brakes, tires.

2005 Nomad Rampage toyhauler made by Skyline. 11,500lb gvwr.
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Old 08-14-2008, 03:06 PM   #4 (permalink)
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What kind of a lift do you need, in order to put 22.5's on?

How noticeable is the ride difference with 22.5's? By that I mean, is the ride a lot harsher than with the stock tires?

How much more wear do you get with the 22.5's?
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2004 F-350 CC DRW LB FX4 4x4
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Old 08-14-2008, 06:03 PM   #5 (permalink)
 
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Quote:
Originally Posted by Strokin' 6.0 View Post
What kind of a lift do you need, in order to put 22.5's on?

How noticeable is the ride difference with 22.5's? By that I mean, is the ride a lot harsher than with the stock tires?

How much more wear do you get with the 22.5's?
Here is an example with a 2.5" lift (you will need approximately 3" minimum on your '04):



IMO, the tires are not very rough with proper inflation. Tread wear will not be an issue. These tires are designed for huge miles on an 80,000 lbs rig. They hardly notice the weight of the SD.
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Old 08-14-2008, 11:21 PM   #6 (permalink)
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Looks real nice. Aside from size difference, what are the differences between the 19.5 and the 22.5? I've heard that you don't need a lift with the 19.5's.
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2004 F-350 CC DRW LB FX4 4x4
Oxford White/Arizona Beige
King Ranch
2012 Ford bed w/Factory Reese hitch option
4.10 TracLok
Reman'd 6.0L @43,956 miles
Reman'd Turbo @54,814 miles
HPOP @154,120 miles
Radiator, water pump, t-stat & hoses @168,520 miles
Dieselsite Coolant Filter
Fleetrite ELC
Blue Spring Update
River City Diesel EGR Delete
Gutted Cat
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Old 08-15-2008, 11:50 AM   #7 (permalink)
 
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225/70-19.5 32"
245/70-19.5 33"
225/70-22.5 36"

19.5s do not require any lift.
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(888)776-8699


One Up Offroad - Icon Vehicle Dynamics - BDS - RCD - CST - King Shocks - Bilstein
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Old 08-15-2008, 03:55 PM   #8 (permalink)
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Great, thanks for the info....so how far away are you from San Angelo?
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2004 F-350 CC DRW LB FX4 4x4
Oxford White/Arizona Beige
King Ranch
2012 Ford bed w/Factory Reese hitch option
4.10 TracLok
Reman'd 6.0L @43,956 miles
Reman'd Turbo @54,814 miles
HPOP @154,120 miles
Radiator, water pump, t-stat & hoses @168,520 miles
Dieselsite Coolant Filter
Fleetrite ELC
Blue Spring Update
River City Diesel EGR Delete
Gutted Cat
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