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Do offset wheels effect towing?

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Old 08-31-2019, 09:47 AM
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Default Do offset wheels effect towing?

I want to get wheels that are slightly offset. I've always like the look and will be changing the tires to a slight aggressive all terrain. I know the tires will be heavier than stock and effect gas mileage and towing power. Do offset wheels effect my ability to tow?

I tow a 21' CC boat a lot but planning on getting a camper in the 5-6k weight range.

I own a '16 5.0 Screw 4x4, 3.55 gears.

Thanks!
Old 08-31-2019, 10:08 AM
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Originally Posted by Gasser55
I want to get wheels that are slightly offset. I've always like the look and will be changing the tires to a slight aggressive all terrain. I know the tires will be heavier than stock and effect gas mileage and towing power. Do offset wheels effect my ability to tow?

I tow a 21' CC boat a lot but planning on getting a camper in the 5-6k weight range.

I own a '16 5.0 Screw 4x4, 3.55 gears.

Thanks!
No effect at all.
.
Old 08-31-2019, 05:19 PM
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Originally Posted by Gasser55
I want to get wheels that are slightly offset. I've always like the look and will be changing the tires to a slight aggressive all terrain. I know the tires will be heavier than stock and effect gas mileage and towing power. Do offset wheels effect my ability to tow?

I tow a 21' CC boat a lot but planning on getting a camper in the 5-6k weight range.

I own a '16 5.0 Screw 4x4, 3.55 gears.

Thanks!
It will increase loads on the axle housing and bearings (Think longer lever).
In theory if those wheels were used in production the engineer would lower the FAWR and RAWR to account for this.
Whether you are going to load close enough to the limit for this to be an issue is a whole other question.
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Old 08-31-2019, 06:16 PM
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Not that much I think :/
Old 09-01-2019, 08:49 AM
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Originally Posted by Gene K
It will increase loads on the axle housing and bearings (Think longer lever).
In theory if those wheels were used in production the engineer would lower the FAWR and RAWR to account for this.
Whether you are going to load close enough to the limit for this to be an issue is a whole other question.
Thank you, I hope not to be near the max at all.
Old 09-01-2019, 03:14 PM
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Originally Posted by Gene K
It will increase loads on the axle housing and bearings (Think longer lever).
In theory if those wheels were used in production the engineer would lower the FAWR and RAWR to account for this.
Whether you are going to load close enough to the limit for this to be an issue is a whole other question.
As a heavy truck axle engineer - can confirm. Will definitely derate bearing capacity and life especially loaded. Now your particular duty cycle and offset might not matter THAT much for your overall life, but it definitely would be a de-rate.

Example (heavy truck axles are all 2 tapered bearing systems): offsetting wheels by 2-3in can derate an axle down from 18,000lbs GAWR to 12,000lbs simply due to bearing loading. We had one RV application using a 6.5in offset and we had to use special Timken bearings and a heavier duty axle to get the rating back up to 14,000lbs.

The F150 is a single roller bearing which is much lighter duty and would be more sensitive to eccentric loads, so don't go too far and don't cry if you burn up bearings at full payload. If you're talking a 0.5" offset then maybe it's not a huge de-rate, but I personally cringe at the 2-3in offset systems I see some guys running.

Last edited by SoPoSassquatch; 09-01-2019 at 03:16 PM.
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Old 09-01-2019, 05:12 PM
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You also need to look at the weight limit on the wheel, I have seen wheels with a weight rating down as low as 2500. If weight limit goes down so does side load and the rotational load.
Old 09-01-2019, 05:26 PM
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Originally Posted by SoPoSassquatch
As a heavy truck axle engineer - can confirm. Will definitely derate bearing capacity and life especially loaded. Now your particular duty cycle and offset might not matter THAT much for your overall life, but it definitely would be a de-rate.

Example (heavy truck axles are all 2 tapered bearing systems): offsetting wheels by 2-3in can derate an axle down from 18,000lbs GAWR to 12,000lbs simply due to bearing loading. We had one RV application using a 6.5in offset and we had to use special Timken bearings and a heavier duty axle to get the rating back up to 14,000lbs.

The F150 is a single roller bearing which is much lighter duty and would be more sensitive to eccentric loads, so don't go too far and don't cry if you burn up bearings at full payload. If you're talking a 0.5" offset then maybe it's not a huge de-rate, but I personally cringe at the 2-3in offset systems I see some guys running.
I was hoping to find wheels with 0.5". However, now I'm thinking maybe just slight agressive all terrains and different wheels than stock with no offset would be a better option.
Old 09-01-2019, 05:27 PM
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Bump steer is noticeable if they sit out too far.
Old 09-01-2019, 08:17 PM
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A 1/2" offset, I'd agree with no affect at all. The credentials have voted but come on it's a 1/2". I've run 2" spacers for 50k and no crying yet, might be coming but not yet.
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