CCC

[Bill Davis]

I’ve read on different posts where Aluminum wheels increase the ccc because there lighter. I’m curious how unsprung weight helps the load carrying capacity? What am I missing?

[B and B]

It is all on the scale, that is part of GVWR.

[bclemens]

^^what he said^^

[Bill Davis]

So ccc only applies to how much weight the tire itself can carry?

[luker0]

CCC is gross vehicle weight - dry trailer weight. It's that simple.

Also pretty much a fictitious number since no trailer is ever delivered at the dry trailer weight.

[valleyduo]

CCC is your allowed cargo weight. It works and flexes with all the other numbers on your rig. Lets say you have a 6000lb camper with an 8000lb gvwr. That leaves 2000lb ccc. If you change steel to aluminum rims the camper weight drops to 5900lb, your ccc can rise to 2100lb. The gvwr stays the same and always will. If you add a battery bank your weight may rise to 6200lb. Now your ccc is dropping to 1800lb.

[Bill Davis]

Originally Posted by valleyduo

CCC is your allowed cargo weight. It works and flexes with all the other numbers on your rig. Lets say you have a 6000lb camper with an 8000lb gvwr. That leaves 2000lb ccc. If you change steel to aluminum rims the camper weight drops to 5900lb, your ccc can rise to 2100lb. The gvwr stays the same and always will. If you add a battery bank your weight may rise to 6200lb. Now your ccc is dropping to 1800lb.

I understand the aluminum wheels reduces the gvwr. My point is the stuff we load in our rvs is sprung weight. The wheels are unsprung weight. That said, installing aluminum wheels does not help the unsprung weight capacity. It only helps to reduce gvwr.

[bclemens]

Yes, but CCC does not just apply to sprung weight. It is GVWR minus UVW . GVWR is the limiting factor and that is normally a specific item. So it might be transmission...sometimes I have seen GVWR go up (like on the Ford E450) because brakes were the limiting factor. They increased the brake size and ended up with higher GVWR. The aluminum wheels actually reduce the UVW.

So if you reduce the UVW, then you increase the CCC.

As an example, the new 4500 has an extra 2,000 lbs of GVWR, not sure what they do to get that, but the GCWR does not change. So you go from 4k of towing to 2k of towing. That change was geared toward work vans as I understand it...that won't tow.