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Old 03-20-2021, 03:06 PM   #1
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Do Aluminum Wheels increase OCCC

I heard that Winnebago uses Aluminum wheels to increase OCCC, is that true? I understand that GVWR is 11,030 lbs. The cargo carrying capacity for a Sprinter 3500 Chassis is 4667lbs. If you weigh your vehicle empty without any gear you are normally subtract that weight from the GVWR to get the OCCC. That said, aluminum wheels weight less than steel ones. I thought the GVWR max is due to the suspension. Wheels and tires are below the suspension, is this cheating to increase OCCC and dangerous? I am confused.
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Old 03-20-2021, 03:54 PM   #2
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Quote:
Originally Posted by Eric F View Post
I heard that Winnebago uses Aluminum wheels to increase OCCC, is that true? I understand that GVWR is 11,030 lbs. The cargo carrying capacity for a Sprinter 3500 Chassis is 4667lbs. If you weigh your vehicle empty without any gear you are normally subtract that weight from the GVWR to get the OCCC. That said, aluminum wheels weight less than steel ones. I thought the GVWR max is due to the suspension. Wheels and tires are below the suspension, is this cheating to increase OCCC and dangerous? I am confused.
Some of that GVWR is also based on braking ability, engine/transmission power to accelerate, and some other factors I don't recall. It all has to work within the bounds of the 11,030 lb max.
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Old 03-20-2021, 04:16 PM   #3
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GVWR includes unsprung weight, so no this isn’t cheating. Lowering the unsprung weight actually reduces the suspension load when the axel rebounds.
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Old 03-20-2021, 06:31 PM   #4
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Isn’t towing going to effect braking and engine power? The RV can tow even with being maxed out on GVWR.
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Old 03-21-2021, 07:48 AM   #5
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To answer your question - No, aluminum wheels do not increase your OCCC. The weight difference between an aluminum wheel and a steel wheel is minimal - like in less than 20 lbs. Aluminum wheels are, however, able to add something that every manufacturer wants - more dollars to the bottom line.
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Old 03-22-2021, 06:57 PM   #6
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Actually aluminum wheels may increase your OCCC, but not your GVWR. 16 inch Aluminum wheels weight 5-6 lbs less than 16 inch steel wheels. Going to aluminum wheels you reduce total weight by 20-24 lbs which would increase your carrying capacity. Aluminum wheels are usually only on the outside of the rear duals so only 4 wheels are replaced.. You could add 2 big macs and a large Gulp
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Old 04-02-2021, 07:39 AM   #7
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further info on aluminum rims can be found if you search:


benefits of aluminum wheels over steel


might be a good to look at if you're considering a new purchase and are looking at upgrading to aluminum.
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Old 04-02-2021, 07:57 AM   #8
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Personally I think that aluminum wheels are only an appearance thing. Most manufacturers put them on their rigs, but as has been indicated above, they're not that much lighter than steel wheels. There are also some downsides to aluminum wheels. The first is that aluminum will corrode at the bead causing rim leaks. This is especially true if you drive your rig on salty roads or on the ocean beach. Another down side is that they are more prone to cracking if the tire bottoms out on a pot hole. While this is not common it does happen on occasion. On the up side since they are lighter they reduce the unsprung weight ratio which should help the ride somewhat. Again, since the difference is minimal, I'm not sure it will make a noticeable difference. Will I keep mine, yep. Would I maybe trade them for steel wheels if given the chance? Maybe, it depends if they give me problems.
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