The Off-Road Wheel Thread

MiddleAgeSubie

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Let's talk WHEELS. Let's this thread make it unnecessary for people to waste time discovering the hot water...

Stock wheels on 2013 OB have been weighed by another member at just under 22 lb. This is a good weight for strong wheels. How strong? Subaru does not publish the load rating but I was told that it was in the ballpark of the stock tire, my OEM tire is just over 1,600 lb. I was also told that an option is to take the maximum vehicle weight, divide by four (axle gross weights are almost identical) and add a hefty margin. I am the first to complain about tires but the stock wheels are good wheels. Don't throw your OEM wheels under the bus because you find the style generic. Over 600 miles on "Jeep trails" and over 1,500 miles off-pavement total, no issues.

Reasons to get another set of wheels (add, dispute, whatever):

-switching between sizes (no one seems to have actually tried 16" RALLY wheels over the large 12.4 brakes). Obviously, this is a must for 2015 Limited trim cars.

-not willing to waste AT thread in town (I am making my way into this group). Changing to AT for a season, if most off-pavement travel occurs over, say, summer, may work, but it would prevent flexibility.

-AT tires are way heavier than stock, want a bit of weight reduction via lighter wheels (esp. true for TA KO2, soon supposed to be available in 225 65 17).

-kids would love (fill in) wheels?
smile.gif
Whatever comes to mind.

Reasons not to get another set of wheels:

-Price of new good enough wheels.

-Don't want to worry about pricey wheels being stolen while spending a night at a motel on way to base-camp. Wheel locks off-road? Ugh...

-Good old wheels may be cheap but can look odd on a newish car.

-Room for keeping wheels.

What wheels will do? That is a personal decision, I guess. TireRack checks for wheel load ratings but they allow apparently 1/4 of GVW, which is far below what the OEM rating seems to be. They surely do not think off-road. For me:

1/ minimum load rating of ??? . This seems important. The stock wheels can handle 3-wheeling, 3x1,600=4,800. I have not had serious 3-wheel situations with the car weighing more than 4,000, but it should be able to handle the lesser ones even if loaded to the top. By "serious" I mean a steep drop with a rear wheel high up. This means weight transfer and thus the front two wheels taking more than 2/3 of the weight of the car. What does this mean? Probably, that the wheel should at least meet, fully, a 1/3 GVW rating. Even so one may want to be extra careful with a full car.

2/ design that avoids few and tiny spokes.

3/ weight that does not exceed 25 lb but ideally weight under the stock one.

4/ wheels style does not scream "look at me," wheels are not painted bright green, and so on.

Good off-road wheels seem to start at over 200 for wheels heavier than stock--and to be 17x8 instead of 17x7 or 17x7.5. Then one quickly gets over 300--and the weight does not come down as fast as the price goes up.

So far, the most cost-effective solution seems recent OEM take-offs. The quality is there, the weight of a 2013 wheel would be acceptable, and the price can be a fraction of the cost of a new set. 2015 Limited owners may be getting a benefit from just going 18 to 17 OEM wheels.

Experiences? Thoughts? Some of you know a thing or two about metals, and/or are engineers, and/or are experienced wheelers, or rallycross...

:cool::cool::cool::cool::cool::cool::cool::cool::cool::cool::cool::cool::cool:

Next, examples:

Wheels that look appealing by weight but are not even close to what the OEM load rating seems to be:

OZ HLT Allegerita at 1350lb
TSW Nurburgring and Interlagos at 1350lb
Kosei light-weight wheels at around 1200lb, ugh.

Closest option seems to be: RPF1 at 1500lb and under 16 lb. However, this has reputation for being like butter. Many seem to brake these wheels on road when hitting potholes. Tiny, few spokes are spooky.

The above info was gathered from manufacturers' sites and TireRack chat (great Tire Rack function: courteous employees provide precise information quickly).

Method MR501/502 start at just over 200 and are tough, 1850lb load rating. BUT, 17x8? I see no advantage, indeed, maybe too large for 225s, no?

BRAID wheels are great, but they are made for specific applications. The lighter ones are 1375 lb termac/rallycross competition wheels. Maybe just fine for off-road use that does not involve high speeds, BUT...

The BRAID off-road wheels are heavy and expensive. They will be very tough, too, I think at about 1750lb, but, again, heavy and pricey.

DISCLAIMER: ALL DATA OBTAINED FROM TIRE RACK, MANUFACTURER WEBSITES, AND DISTRIBUTORS BUT IS MEANT ONLY FOR GENERAL ORIENTATION. Check with producer/seller before buying any wheels.









 
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The next thing to consider, then, is whether heavy wheels and heavy tires require other changes. The combo of 17" off-road wheels and three-ply sidewall tires in 225-65-17 would result in 63-64 lb weight per corner vs. 46 stock.

With that in mind, such a combo would only be good as a dedicated-use set, not as a daily driver set.

One option is to upgrade pads and, if necessary, braking fluid. That is as much as the race team owner I talked to does to his cars in terms of brake upgrades. This is an easy and comparatively cheap upgrade. Personally, I like the description of EBC red stuff pads.

But can the heavy wheels and tires overstress driveline components? Is that anything to worry about at all?
 
Gidday MAS

Another thing to keep in mind - my insurer will void my comprehensive insurance if I fit other than OEM rims ... :cry:.
 
Gidday MAS

Another thing to keep in mind - my insurer will void my comprehensive insurance if I fit other than OEM rims ... :cry:.

That's sad. I think that your insurer would not last long in the US!

Today I saw an ad for 2011 WRX wheels, which are 17x8, 5x100, but +53 is what I do not like about them. Mine are +48 and if I get a second set I would rather get +42 or even +38.

Otherwise, they are just a bit less strong (if that, judging by the tires is all I can do). They also look good.
 
That's sad. I think that your insurer would not last long in the US!

Today I saw an ad for 2011 WRX wheels, which are 17x8, 5x100, but +53 is what I do not like about them. Mine are +48 and if I get a second set I would rather get +42 or even +38.

Otherwise, they are just a bit less strong (if that, judging by the tires is all I can do). They also look good.

Yeah, I've got +53 offset 7" GC WRX alloys and I can't fit chains any more... I have to use my AT tyres on the +48 OEM steels if I need to fit chains.
I've also weighed my wheels - the WRX alloys with 215/65r16 Kumho KH18 roads are 19kg each, whereas my OEM steels with 215/65r16 Dueler 697 AT are 25kg each! Performance definitely takes a hit with them on...
 
Yeah, I've got +53 offset 7" GC WRX alloys and I can't fit chains any more... I have to use my AT tyres on the +48 OEM steels if I need to fit chains.
I've also weighed my wheels - the WRX alloys with 215/65r16 Kumho KH18 roads are 19kg each, whereas my OEM steels with 215/65r16 Dueler 697 AT are 25kg each! Performance definitely takes a hit with them on...

LOL, you're the one I need for opinion:lol: You have exactly the same weight difference I plan to have in the future! I plan to upgrade my pads anyway. But I wonder about any other consequences of the heavy wheel/tire combo. I know it smooths the ride out even further. But can it overstress any driveline or suspension components over time if used for 3-5,000 miles per year with the normal tires used 6-10,000 miles per year?
 
I edited the initial post to add a more sensible take on wheel rating. I cannot believe I missed that earlier. Obviously, one wants wheels that can easily take 1/3 of the load of the fully loaded car, assuming that really tough situations are met with a lighter car. When a rear wheel is in the air AND the car is on a steep slope, then the front wheels take more than 2/3 of the weight.

Therefore, the stock wheel rating is the very minimum.
 
Yes, that is a nice thread.
 
Can I suggest you talk in metric? Not really a fan of turning back the clock half a century to try to understand pounds lol.

What is the weight of your fully loaded Foz. Guessing at least 2ton.

Allowing for weight transference when going down a step on a steep slope, the 2 front wheels would take at least 3/4 of that weight so 750kg ea.

If this was on a diagonal, ie, with a rear wheel lifted, more weight would be on the outside wheel, so maybe 1000kg.

That's when edging smoothly down, not allowing for momentum. With momentum it could easily be doubled!!!

All the wheels you've mentioned seem to be under 2000lb which is less than 1000kg. Considerably less than what I would be happy trusting.

I would suggest go with what is known to be reliable offroad, which is OEM alloys (you also talked about your OEM wheels on 2013 OB were 22 lb but didnt state if they were steelies or alloy). Steelies have a reputation for bending and are too heavy.

Or look at known offroad brands like Enkei rally wheels (used by the Subaru factory rally team) and OzRally
 
LOL.

I do not care, either way. I work with the numbers whichever way they come through.

My car has a max gross of 4,700 or 2,130 kg (1,655 empty).

The stock wheel has a rating of approximately 1,600 (725), see my post below.

That has been enough for really tough situations. There is no momentum in those cases. You are going a few cm at a time! Never done that fully loaded, though.

There is one lightweight Enkei "rally" wheel here that has 1,500 load rating but it has the reputation of being like butter.

My conclusion is that one should either get a set of OEM take-offs or get off-road wheels: a bit heavier than stock, but very strong.
 
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Where does one find the load rating of the OEM Rims.?
 
Great question! Nowhere. I asked the dealer who I think called Subaru and apparently they told him that while they do not publish it, the load rating of the OEM tire is a good approximation. In my case that means just over 1,600 lb.

In the absence of any better info, I go with 1,600 which was my initial guess anyway, for the same reason. I would assume that the wheel rating is a bit higher than that of the tire.

EDIT: Oh, and I am sure all wheels by reputable producers have a braking strength that exceeds the load rating which should help with those brief moments when a great deal of the vehicle weight is on only two wheels.
 
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I'm very surprised the load rating of a OEM wheel or tyre is only 725kg.

Estimates off the top of my head:
1800kg (wet weight plus driver)
Weight distribution ~60/40 = 540kg each front wheel
under .78G braking (max as measured by Car & Driver mag): becomes 961.2kg each front wheel. Already well & truly exceeded that figure!
Add a bump in the road (estimate at least 1/3 or 30%) during emergency braking front tyre/wheel sees at least 1250kg. Not far off double their figure!
 
Guess it's a SWL
 
Given that on a few longer expeditions, eg to the Cape, or the Simpson, cars will be approaching, if not well over the GVM, then wheel loadings will be much higher than these quoted ones.
Both these destinations involve many corrugations and bumps necessitating slower speeds with reduced tyre pressures.
Not always easy or possible.
 
Back to wheels. I happened to read through a rally thread somewhere on the internet. Apparently some guys prefer cheap wheels because, they argue, breaking a wheel is better than breaking the suspension, i.e. an overly strong wheel will HURT rather than help when they hit that rock.

Many seem to do well on wheels below the supposed OEM wheel load rating. After all, the wheel is not really what carries the weight and when wrapped in a tall, heavy tire, it is also well protected unlike the wheels of fast cars running low profile tires (which get damaged when the car hits potholes and such).

I just talked to someone who ran for a while cheap wheels of only 1340 load rating (vs 1600 supposed for stock) in deep sand at 15 psi and had no issues.

Aside from hitting stuff at some speed, under what circumstances do wheels bent or break off-road, in your experience?

We discussed briefly somewhere here weight transfer during steep descents, but my dealer tech laughed that concern off due to low speed and short duration.
 
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I'd rather have a wheel brake than break... :bananatoast:
 
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