opinion on HRE wheel style

**westwest888** · 03-21-2014 08:35 PM

These are the wheels I'm really into right now. What does everyone think? This is a 20" x 9.5". Of course I'd stick with the standard 265 width tire (265/30 20" XL load rated) that the RS5 uses. These probably weigh about 25.x pounds each. They're forged.

**Mops@Nemesis** · 03-21-2014 08:39 PM

I love that wheel. No way they weigh 25lbs. My 20x10.5 2pc BC's weight 25.4.

Check this….

http://www.audizine.com/forum/showth...-B8-5-S5/page4

**westwest888** · 03-21-2014 08:57 PM

Originally Posted by Mops

I love that wheel. No way they weigh 25lbs. My 20x10.5 2pc BC's weight 25.4.

Check this….

http://www.audizine.com/forum/showth...-B8-5-S5/page4

It's a P47, not a P47SC. That adds about 3-4 pounds. And it's 20" so not the lightest.

**SeaBassHWD** · 03-21-2014 09:04 PM

Not my style but to each their own.

**SwankPeRFection** · 03-21-2014 09:08 PM

For someone who's into tracking you sure have a weird direction in terms of wheels. Sure, they're lighter than the stock wheels, but 19 vs 20 in regards to weight and how it's distributed in terms of distance from radius, maybe it's a wash. Anyone want to dig up the formula to figure this out?

Oh and keep in mind it won't look like the one on the S5. The offset will be different to fit on your S4. You just don't have the fenders for it.

**SeaBassHWD** · 03-21-2014 09:09 PM

I assume you won't be using these for the track, correct?

**westwest888** · 03-21-2014 09:13 PM

I only run one set of wheels. I'd roll these right on track.

**westwest888** · 03-21-2014 09:18 PM

Originally Posted by SwankPeRFection

For someone who's into tracking you sure have a weird direction in terms of wheels. Sure, they're lighter than the stock wheels, but 19 vs 20 in regards to weight and how it's distributed in terms of distance from radius, maybe it's a wash. Anyone want to dig up the formula to figure this out?

Oh and keep in mind it won't look like the one on the S5. The offset will be different to fit on your S4. You just don't have the fenders for it.

I'm running -2.6 camber in front. You don't think it would tuck nice? In looking into this, it's about a 15mm difference or 6/10 of an inch.

**raudiace4** · 03-21-2014 09:23 PM

As much as you love to track your car you're gonna run 20s? I thought you were about that maximizing chariot for track life.

**westwest888** · 03-21-2014 09:30 PM

Originally Posted by raudiace4

As much as you love to track your car you're gonna run 20s? I thought you were about that maximizing chariot for track life.

19" tires and 20" tires are both about $300 a set, plus or minus $20. No real disadvantage to running a 20". The RS5 does fine with it. You even get 10mm more width. Less sidewall flex. Maybe it's up to 1 pound heavier but has less compressed air in it. It's kind of a wash.

**apexit1** · 03-21-2014 09:53 PM

You'll gain 1-2lbs by going up that 1" I think. No the air in the tire won't compensate for it. While we're on topic for weight, look at the tire weight too. I want to say the PSS are the lightest tire in theyre class and also happen to have the best ratings.

I'm not a huge fan of those wheels on an S4 but to each their own, I also think 20's are too big visually for our cars.

**westwest888** · 03-21-2014 10:00 PM

I like this style because it's very close to the peeler, but with better engineering. I want to keep the sleeper look going.

**apexit1** · 03-22-2014 06:47 AM

The edges are too sharp to resemble an oem wheel. If you want an oem look I'd look at the 797RS and a little different RB1. They flow more organically if that makes sense. They'd look pretty dope too and I've yet to see a car with them

**drob23** · 03-22-2014 06:52 AM

I don't see how 20" HRE wheels scream "sleeper" but I'm sure they'll look good, very AMG in the spoke pattern.

**SteveYem** · 03-22-2014 06:57 AM

Originally Posted by SwankPeRFection

For someone who's into tracking you sure have a weird direction in terms of wheels. Sure, they're lighter than the stock wheels, but 19 vs 20 in regards to weight and how it's distributed in terms of distance from radius, maybe it's a wash. Anyone want to dig up the formula to figure this out?

Oh and keep in mind it won't look like the one on the S5. The offset will be different to fit on your S4. You just don't have the fenders for it.

Correct, and many people do not consider the distribution of mass and instead are only concerned with overall weight. It's a classic "accelerate the flywheel" example.
T = I x alpha where T is torque, I is the inertia of the wheel and alpha is the angular acceleration of the wheel. The higher the inertia of the wheel+tire combo, the more torque will be required to accelerate the wheel+tire to a given speed over a given period of time.

I have always thought wheel manufacturers should include the wheel inertia in their spec sheets, especially for these high-end wheels.

**westwest888** · 03-22-2014 08:59 AM

Two questions that I have not thought about enough to have conviction on:

1) If I bought a set of used HRE from an S5 owner could I machine away the extra material to achieve the correct offset? I can drop them off at HRE next time I'm in SoCal.

2) If I got the RS5 carbon ceramic brake kit would it move the hub out to the right position for an S5 wheel? Or am I conceptually lacking an understanding of these components?

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**IanVr6** · 03-22-2014 09:14 AM

Can HREs withstand track duty?

**SteveYem** · 03-22-2014 09:34 AM

Originally Posted by westwest888

Two questions that I have not thought about enough to have conviction on:

1) If I bought a set of used HRE from an S5 owner could I machine away the extra material to achieve the correct offset? I can drop them off at HRE next time I'm in SoCal.

2) If I got the RS5 carbon ceramic brake kit would it move the hub out to the right position for an S5 wheel? Or am I conceptually lacking an understanding of these components?

Sent from my Nexus 5 using Tapatalk

By removing thickness at the mounting area, you lose some strength. When taking turns, the wheel wants to come off the hub due to the grip of the tires but it is held in place by the lug nuts. [I know you know all this]. If you remove too much material, you won't have enough metal remaining between the bottom of the lug hole and the mounting surface of the wheel and that will become a weak point. If you are talking a millimeter or two, it's probably not worth worrying about too much....but I'd still worry about it a little.

Maybe run it by HRE and see what they think.

**apexit1** · 03-22-2014 09:45 AM

Doubt HRE would want to do that. Def contact them first to see if they would

**Steve416** · 03-22-2014 10:02 AM

Or you could look at the Forgestar F14 which resembles the B7 RS4 rims which look nice on our cars. They are flow formed so pretty light and not too expensive. Also, you can do a range of custom offsets at no extra cost so no need to take risks machining the rim. The 18x9 weighs about 18lbs (this is probably what I will get for summer along with some lighter tires for a total weight of about 43lbs). I think the 19x9 is like 20lbs. I'm guessing the 20s are lighter than the HREs you're contemplating. Food for thought.

**westwest888** · 03-22-2014 10:32 AM

Originally Posted by IanVr6

Can HREs withstand track duty?

Plenty. HRE wheels have one of the highest static load ratings of any wheel produced at nearly 700 kg (at which point the the wheel distends or ovals). Their supply chain on 6061 aluminum, tooling, manufacturing floor and QA room are all top notch. The shop floor is about as clean as an operating room in a hospital.

**LYKUNO** · 03-22-2014 12:55 PM

Originally Posted by westwest888

Plenty. HRE wheels have one of the highest static load ratings of any wheel produced at nearly 700 kg (at which point the the wheel distends or ovals). Their supply chain on 6061 aluminum, tooling, manufacturing floor and QA room are all top notch. The shop floor is about as clean as an operating room in a hospital.

I like the P40s - available in 19 & 20"