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Search took 1.37 seconds. Search: Posts Made By: Ubersuber
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-22-2014, 11:19 AM
Replies: 209
Views: 60,450
Posted By Ubersuber
Yes. Ideally, tires would have variable...

Yes.

Ideally, tires would have variable pressure while driving. This is impractical but Porsche did so for its 959.

TPMS could be set up to show real time tire pressures and you would then...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-22-2014, 10:59 AM
Replies: 209
Views: 60,450
Posted By Ubersuber
None of this makes any sense except you get the...

None of this makes any sense except you get the technical description of slip angle right.

However, tire engineers only consider slip angles for non sliding tires as the term has no useful meaning...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-22-2014, 10:47 AM
Replies: 209
Views: 60,450
Posted By Ubersuber
You were doing quite well until you included this...

You were doing quite well until you included this howler.

Contact patch size results from higher load, it in no sense supports anything.

Higher tire pressures support higher loads basically...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-22-2014, 10:45 AM
Replies: 209
Views: 60,450
Posted By Ubersuber
And what front pressures did you try? I...

And what front pressures did you try?

I would guess that 34 psi would be Michelin's recommended cold pressure if they had one. Close to it anyway.
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-22-2014, 10:44 AM
Replies: 209
Views: 60,450
Posted By Ubersuber
Not quite true. The variability of torque bias...

Not quite true. The variability of torque bias depends both on gear angles (primarily) and end thrust plate materials. Some manufacturers will sell you different thrust "washers" to change the bias...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-22-2014, 10:42 AM
Replies: 209
Views: 60,450
Posted By Ubersuber
Depends where in the corner you are. Corner...

Depends where in the corner you are. Corner entry yes, corner exit the opposite is true. Usually.
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-22-2014, 10:41 AM
Replies: 209
Views: 60,450
Posted By Ubersuber
Assuming the tyre is a balloon, which it isn't....

Assuming the tyre is a balloon, which it isn't. So, you can't calculate contact patch area using this method.

You can develop a curve of contact patch area using this method for a single tire and...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-19-2014, 06:38 PM
Replies: 23
Views: 11,623
Posted By Ubersuber
Because the F 150 uses ancient technology and...

Because the F 150 uses ancient technology and doesn't fit hubcentric rims. I think you'll find the Sherman tank didn't either.

I don't know why the CRV doesn't use hubcentric rims but I could...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-19-2014, 06:32 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
1 psi per 5 degrees C (approximately) it is...

1 psi per 5 degrees C (approximately) it is actually a bit less than that but 1 psi per 5 degrees C or or 10 degrees F is close enough.

This means adjusting the cold pressure to what the cold...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-19-2014, 06:26 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
Not really, you just keep reading in stuff that...

Not really, you just keep reading in stuff that isn't there or taking what is there out of context.

Contact patch area has nothing to do with load capability. The tire will hold up the same load...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-19-2014, 06:19 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
None of this makes any sense. The link I...

None of this makes any sense.

The link I posted doesn't have a page 17 to begin with.

Oversteer is defined by reference to slip angles. Lower tire pressures result in higher slip angles for...
Forum: Suspension | Chassis | Brakes -- Sponsored by 949 Racing 09-18-2014, 11:01 AM
Replies: 12
Views: 6,810
Posted By Ubersuber
Body roll results from cornering force. Unless...

Body roll results from cornering force. Unless you change the spring rate body roll is proportional to cornering speed, not tires. Body roll results from the momentum of the sprung weight...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-18-2014, 10:50 AM
Replies: 209
Views: 60,450
Posted By Ubersuber
On my car nothing pushes. Really, quoting a...

On my car nothing pushes. Really, quoting a version of Newton's Law (and the third one at that) helps this debate?

Your car is only held up in the manner you suggest when all four tires are flat....
Forum: Suspension | Chassis | Brakes -- Sponsored by 949 Racing 09-18-2014, 10:40 AM
Replies: 305
Views: 99,910
Posted By Ubersuber
With stock BRZ springs I found the Bilstein B6 to...

With stock BRZ springs I found the Bilstein B6 to work perfectly.

You might consider swapping out your GT86 springs for a set of BRZ springs.

I also shortened the rear bump stops but that of...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-18-2014, 10:34 AM
Replies: 23
Views: 11,623
Posted By Ubersuber
This is very dangerous advice. Modern cars...

This is very dangerous advice.

Modern cars absolutely require hubcentric rings and no competent wheel shop will fit such rims without them.

The shoulders on lug bolts or nuts are definitely...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-18-2014, 10:24 AM
Replies: 209
Views: 60,450
Posted By Ubersuber
Wheel radius isn't relevant to volume except as a...

Wheel radius isn't relevant to volume except as a number in the calculation. You need to calculate the volume of a torus which requires the inside circumference, the outside circumference and the...
Forum: BRZ First-Gen (2012+) -- General Topics 09-18-2014, 10:17 AM
Replies: 29
Views: 9,729
Posted By Ubersuber
Re Apex, yes, yes. Practice this skill every...

Re Apex, yes, yes. Practice this skill every time you drive. Stay within the lane markings (the law requires it and doing so improves your driving skills) but follow the proper line even though your...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-17-2014, 08:32 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
More air inside automatically increases the load...

More air inside automatically increases the load capacity of a tire but that isn't the reason.

Load ratings are decided upon by tire manufacturers to provide fitment solutions for the vehicles...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-17-2014, 08:28 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
???? This is dangerously incorrect. As...

????

This is dangerously incorrect.

As far as load carrying goes you absolutely can compare bike tires to car tires. The air that goes in them is the same.

No bike carries anything like the...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-17-2014, 08:22 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
I don't think you are open to reasonable...

I don't think you are open to reasonable discussion.

Find one technical source that says reducing rear tire pressure from factory specification will reduce oversteer. It isn't possible.
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-17-2014, 08:20 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
35 psi should work fine but you could probably go...

35 psi should work fine but you could probably go as low as 33 psi. The higher pressure will get you better grip most of the time but the lower pressure will likely give you more even tire wear.
...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-17-2014, 08:18 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
I didn't say you were. If Michelin said they...

I didn't say you were. If Michelin said they couldn't advise you then they were lying since they have actually published such advice:
...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-17-2014, 08:14 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
As for Michelin not knowing or not telling you...

As for Michelin not knowing or not telling you how to inflate your tires, not so:

http://www.tirerack.com/tires/tiretech/general/Michelin_Care_and_Feeding.pdf

Note that this advice is very...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-17-2014, 08:11 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
You are missing the volume effect. There is more...

You are missing the volume effect. There is more air in the larger tire, i.e. the 215/45x17 tire has a smaller air chamber than the 225/45x17.

It is the volume of air that supports the load...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-17-2014, 08:06 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
No it didn't. Lowering rear tire pressure below...

No it didn't. Lowering rear tire pressure below recommended will reduce understeer. It cannot reduce oversteer, physically impossible.
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-17-2014, 08:05 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
Dont follow this advice. The center of the tread...

Dont follow this advice. The center of the tread will wear out long before the outside ribs.

ALWAYS follow the manufacturer's recommended pressure or no more than about 3% higher. If your...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-16-2014, 07:37 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
Basically, 37 psi is high for this tire in this...

Basically, 37 psi is high for this tire in this size on this car. If you heat up the tires the tire pressure effects will be worse, not better. Having tire pressures too high front and rear will...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-16-2014, 07:32 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
They were lying to you then. Michelin can...

They were lying to you then. Michelin can recommend the correct tire pressure for any tire they make and any vehicle that tire will fit.

Bear in mind you have to ask them the right question which...
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-16-2014, 07:25 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
The point is simple, even an idiot should be able...

The point is simple, even an idiot should be able to get it. Any version of autocross is irrelevant to the initial post.
Forum: Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack 09-16-2014, 07:24 PM
Replies: 209
Views: 60,450
Posted By Ubersuber
This increases the tendency for this chassis to...

This increases the tendency for this chassis to oversteer. It really doesn't need the help.
Showing results 1 to 30 of 314
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