Load rating 100 tires meet spec, why are 104 "required"?

[GreaseMonkey]

Here is another one for you to ponder. Load ratings on aftermarket wheels are something most people don't pay any attention to. So, how many of the aftermarket wheels you see on a MME don't correctly support the weight.

100%. I was concerned about this and ended up getting OEM takeoff wheels to avoid needing to messing around with load ratings, flimsy center bore adapters, and shitty lug nuts.

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[andycunn]

100%. I was concerned about this and ended up getting OEM takeoff wheels to avoid needing to messing around with load ratings, flimsy center bore adapters, and shitty lug nuts.

Shrug. I'm not an aftermarket wheel kind-of-guy. I'm a terrible artist. The OEM designers seem to have generally better taste than I do. Choosing a wheel rated 104 weight or at least GAWR/2*1.1 sounds like a good idea if you want a different wheel.

Though, I've never heard of a wheel catastrophically failing except for a bent dirt bike rim after flying just a little too close to the sun. But that landing probably would have bent any rim. Do Mach-Es have a maximum altitude rating?

 

[GreaseMonkey]

Shrug. I'm not an aftermarket wheel kind-of-guy. I'm a terrible artist. The OEM designers seem to have generally better taste than I do. Choosing a wheel rated 104 weight or at least GAWR/2*1.1 sounds like a good idea if you want a different wheel.

Though, I've never heard of a wheel catastrophically failing except for a bent dirt bike rim after flying just a little too close to the sun. But that landing probably would have bent any rim. Do Mach-Es have a maximum altitude rating?

Ok, bruh. Good luck to you.

But just you know, minimizing the importance of safety related items is not a good look.

 

[OH2AZ2OH]

Shrug. I'm not an aftermarket wheel kind-of-guy. I'm a terrible artist. The OEM designers seem to have generally better taste than I do. Choosing a wheel rated 104 weight or at least GAWR/2*1.1 sounds like a good idea if you want a different wheel.

Though, I've never heard of a wheel catastrophically failing except for a bent dirt bike rim after flying just a little too close to the sun. But that landing probably would have bent any rim. Do Mach-Es have a maximum altitude rating?

I know someone who snapped an aftermarket wheel on a Mini Cooper S while auto crossing. It was a wheel specifically marketed to auto crossers, and apparently wasn’t the first from that brand to fail. Not exactly normal driving conditions, but it still surprised me given the weight of a mini.

 

[andycunn]

Ok, bruh. Good luck to you.

But just you know, minimizing the importance of safety related items is not a good look.

I apologize for the ill suited context to attempt levity. I reaffirm support for wheels that are not under spec.

I know someone who snapped an aftermarket wheel on a Mini Cooper S while auto crossing. It was a wheel specifically marketed to auto crossers, and apparently wasn’t the first from that brand to fail. Not exactly normal driving conditions, but it still surprised me given the weight of a mini.

Interesting. 'Snapped' is can be a sudden failure. Something more gradual like 'bent' would be better. I believe 'severe service' is one of the reasons police cars use steel wheels.

 

[Teslaeata]

Shrug. I'm not an aftermarket wheel kind-of-guy. I'm a terrible artist. The OEM designers seem to have generally better taste than I do. Choosing a wheel rated 104 weight or at least GAWR/2*1.1 sounds like a good idea if you want a different wheel.

Though, I've never heard of a wheel catastrophically failing except for a bent dirt bike rim after flying just a little too close to the sun. But that landing probably would have bent any rim. Do Mach-Es have a maximum altitude rating?

I have heard of wheels becoming damaged in normal use, and very many people with even OE forged wheels in UK on Beemers have whose wheels suffered buckling & cracking made even more dangerous by people welding cracks on already weakened wheels.

However, don’t know of any catastrophic failures.

Interesting post about the (BMW) Mini wheels, wonder about the connection.

 

[markboris]

Here is another one for you to ponder. Load ratings on aftermarket wheels are something most people don't pay any attention to. So, how many of the aftermarket wheels you see on a Mach-E don't correctly support the weight.

Completely agree with you on this Brian. There are Mach-E owners here that purchase generic, off the shelf wheels that can be adapted to fit but load rating never seems to be one of the things that is questioned. Not to mention there are hardly any wheel manufacturers that list load ratings on their wheels.

I purchase quite a few wheels from Terrance at Signature Wheels for various vehicles (including trucks) that I've owned. Like most custom wheel manufacturers, the wheels are made for the specific vehicle they will be fitted to. I have had this conversation about wheel strength with him a couple of times especially about my trucks. Over the last 4 years I've had four different sets/styles of his wheels for my Mach-E's. While I don't know the load rating of any of them, I know they were manufactured to work with my car and are safe. Terrance needs to input wheel size, offset, bolt pattern, center bore, vehicle weight, load rating and what the car will be used for (road racing, auto cross, towing, daily driving, etc.) in order to make sure they fit properly and are safe. A couple of years ago, there was one of his wheels I wanted to purchase and after he had put in the specs for the Mach-E, told me the design of that wheel would not work because of strength. This is why the only way I purchase aftermarket wheels is when they are custom made for your particular vehicle and use.

 

[markboris]

100%. I was concerned about this and ended up getting OEM takeoff wheels to avoid needing to messing around with load ratings, flimsy center bore adapters, and shitty lug nuts.

I personally would never use a center bore adapter. I would ever only purchase aftermarket wheels that have the proper bore size or have wheels custom made for the car which is what I do. My lug nuts are also custom made grade 5 titanium to fit both my car and what ever custom wheels I run.

 

[Mach1E]

Interesting discussion for the math oriented individuals in the group.

For everyone else? Because safety requires a margin for error.

People drive their tires bald, hit potholes, put too many people and things in the car, drive too fast etc.

And the tires still need to hold up to that abuse.

 

[Jeff-NoVA]

Why risk it? There are plenty of good tire options with the appropriate load rating. Perhaps OP is just having an academic discussion?

 

[andycunn]

Why risk it? There are plenty of good tire options with the appropriate load rating. Perhaps OP is just having an academic discussion?

At this point totally academic. The more expensive 104H Michelin Primacy A/S were installed today instead of the cheaper 100H's. Same as the stock tires that I was happy with for my climate. Michelin makes this tire in both 100 and 104 so it is something to watch out for when shopping this tire on price.

I have no interest in aftermarket wheels. Wheel talk is drifting from "academic" into "internet banter".

 

[Frankis843]

I was looking at the Ford OASIS info for mine and it shows 100H.

 

[markboris]

I was looking at the Ford OASIS info for mine and it shows 100H.

Look what it says on the B pillar VIN sticker of your car. That is what you go by.

 

[Teslaeata]

2022 California Route 1 AWD ER
Front GAWR: 2260 lbs
Rear GAWR: 3255 lbs

P225/60R18 standard load 100: 1764 lbs
Two tires per axle: 3528 lbs
Standard tires exceed the rating of the heaviest axle by nearly 300 lbs.

Can anybody point me to ford documentation clarifying their position on 104 load tires. Are they "recommended" or "required"? Does anybody have insight what specifically is wrong with standard tires that exceed the maximum gross axle weights? I've seen many enthusiastic claims - "standard tires can't handle the weight". But, they are rated to do exactly that.

Always use the maker’s recommended ratings, why wouldn’t you?

 

[Teslaeata]

I apologize for the ill suited context to attempt levity. I reaffirm support for wheels that are not under spec.




Interesting. 'Snapped' is can be a sudden failure. Something more gradual like 'bent' would be better. I believe 'severe service' is one of the reasons police cars use steel wheels.

It’s not just about design weight but also the forces imposed by design weight in conditions of use.

Here in UK one premium brand car maker used to fit forged wheels which cracked, and incredibly people welded them up, because they were ill suited to UK roads with speed humps etc.

Correct advice is do what the car maker tells you to do…….always! Depart from this and don’t whinge about things which failed or cause you expense!!!!

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