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-   -   What's the importance of alumunim wheels on your RV (http://www.classbforum.com/forums/f5/whats-the-importance-of-alumunim-wheels-on-your-rv-7955.html)

Roadtrek Adventuous RS1 07-13-2018 01:32 AM

What's the importance of alumunim wheels on your RV
 
OK, OK... maybe you're concerned about excess weight??

Someone told me it's a savings of 30 pounds... per wheel

On a 6 wheel RV like my RS … that's 210 pounds even if you include the full spare as a 7th wheel I'm carrying on the rig...

I can see if you're spending a lot of time in areas with rust or live there and you're coach is driven where they salt the roads in the winter?

But, in Southern California... where there's NO rust…?

Is this really an issue? And, would you really expect the handling to be that much different?

And fuel economy? I would not worry about that, an extra 210 pounds is not going to change your overall MPG that much.....

SO... given the choice to change all the wheels to aluminum.. I would skip it.. What do you think??

GeorgeRa 07-13-2018 01:44 AM

I bought our van with Al wheels Ö.. and Ö. I like it Ö.. a lot.

Phoebe3 07-13-2018 02:09 AM

1 Attachment(s)
Our van came with aluminum wheels, as well. I consider it a purely cosmetic upgrade and think it dresses-up the van nicely...

Roadtrek Adventuous RS1 07-13-2018 02:51 AM

Understood.... they're nice being all aluminum
 
3 Attachment(s)
Quote:

Originally Posted by Phoebe3 (Post 76636)
Our van came with aluminum wheels, as well. I consider it a purely cosmetic upgrade and think it dresses-up the van nicely...


Yes, I think it's very nice but my wheels look pretty good....

Here's a couple of pictures of my rig....

Knit 07-13-2018 04:40 AM

They save weight at the single most important place ó on the wheels that spin and transfer power to the ground. I donít know the ratio, but I bet pound for pound the lighter wheels are worth multiples of the pounds anywhere else in terms of fuel economy. But they look good too...

Roadtrek Adventuous RS1 07-13-2018 05:46 AM

Agreed... they look great.
 
Quote:

Originally Posted by Knit (Post 76647)
They save weight at the single most important place ó on the wheels that spin and transfer power to the ground. I donít know the ratio, but I bet pound for pound the lighter wheels are worth multiples of the pounds anywhere else in terms of fuel economy. But they look good too...


Ken,

Look... weight is weight... whether it's on the wheels, the rig, or anywhere...it all adds up.

I had my rig weighed and I'm under the limit for the front and rear axle separately....

By the way...you have the 2013 Sprinter RS...how often do you get your transmission fluid changed and serviced?????

I sent you some private messages in the past...did you get them??

---MARK

GeorgeRa 07-13-2018 05:54 AM

Quote:

Originally Posted by Roadtrek Adventuous RS1 (Post 76648)
Ken,
Look... weight is weight... whether it's on the wheels, the rig, or anywhere...it all adds up.
I had my rig weighed and I'm under the limit for the front and rear axle separately....
By the way...you have the 2013 Sprinter RS...how often do you get your transmission fluid changed and serviced?????
I sent you some private messages in the past...did you get them??
---MARK

Except wheels need to spin as already stated in the previous post.

cruising7388 07-13-2018 06:01 AM

Quote:

Originally Posted by Knit (Post 76647)
They save weight at the single most important place ó on the wheels that spin and transfer power to the ground. I donít know the ratio, but I bet pound for pound the lighter wheels are worth multiples of the pounds anywhere else in terms of fuel economy. But they look good too...

Aluminum wheels reduce unsprung weight, probably act as a better tiire heat sink than steel wheels and many have apertures that promote disc brake cooling.

This doesn't get much press but I think it's important when choosing after market wheels that they have similar if not identical offset and back spacing. Our 210 PC aluminum wheels are a flagrant violation of that rule. The stock Chevy wheels have a 23 millimeter positive offset while the aluminum wheels have a 6 millimeter negative offset which pushes the wheels and tires out about 1 1/4 inches from factory specs presumably to improve aesthetics for the wide body rear section, and while it may look better, it's at the cost of increased tire scrubbing, adverse handling characteristics and and increased wheel bearing loads. Wheel offset is a critical part of factory suspension engineering and IMO it's a mistake to mess around with it.

Knit 07-13-2018 06:47 AM

Quote:

Originally Posted by Roadtrek Adventuous RS1 (Post 76648)
Ken,

By the way...you have the 2013 Sprinter RS...how often do you get your transmission fluid changed and serviced?????



I sent you some private messages in the past...did you get them??



---MARK


We are following MB service recommendations. We are at ~45k miles. I donít recall right now if we have had recommended service on the transmission fluids. I will check.

I did get your PMs

avanti 07-13-2018 12:15 PM

Quote:

Originally Posted by Roadtrek Adventuous RS1 (Post 76648)
Look... weight is weight... whether it's on the wheels, the rig, or anywhere...

Weight is most certainly NOT weight. George mentioned rotational weight, and Cruising mentioned unsprung weight. Both are correct.

Rotational weight (tires, wheels, driveshaft, etc) affect fuel economy because it needs to be accelerated and decelerated TWICE: linearly (just like the rest of the vehicle), but also ROTATIONALLY. Rotational weight contributes two to three times as much to fuel consumption as non-rotational weight.

Unsprung weight (tires, wheels, axles, bearings, often brakes, etc) does not as such affect fuel milage, but it behaves very differently from sprung weight on rough roads, and thus smoothness of ride. Most (but not all) of these effects are negative.


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