When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
So I started things up with BC this morning. They sent me a picture of the design and correct color that I want, see below the set of 4.
They also sent a pic with red wheels for fitment comparison that looks pretty good (fitment I mean, lol). Wheels in the pic are 20's, but it still gives a good view of what the 19's will look like.
So they are recommending:
Front: 9.5" with +35 offset and claim it will push the wheel out 8mm (this is what the spec in the picture is)
Rear: 10.5" with +50 and claim this will push out the wheel 14mm relative to stock.
They said the 265's and 305's will be fine.
These are the specs in this picture that looks pretty good to me:
This is a picture of the wheels I am going for (EH172 in Brushed Dark Black)
So I started things up with BC this morning. They sent me a picture of the design and correct color that I want, see below the set of 4.
They also sent a pic with red wheels for fitment comparison that looks pretty good (fitment I mean, lol). Wheels in the pic are 20's, but it still gives a good view of what the 19's will look like.
So they are recommending:
Front: 9.5" with +35 offset and claim it will push the wheel out 8mm (this is what the spec in the picture is)
Rear: 10.5" with +50 and claim this will push out the wheel 14mm relative to stock.
Pilot sports run a bit wide. You think 305's still alright?
I have never had Michelins on these wheels, so, I honestly don’t know the answer to your question. However, I can tell you that with these Continentals there is literally only 2-3 mm left to play with. If your wheel’s offset is a tad conservative, you can still gain clearance with a 3mm spacer. If your offset is too aggressive... it’d have to be a smaller tire.
That shade of red is fawking nice! Although I did have some red wheels once haha. What's the cost per if I may ask.
Looks like the average price of their wheels is about $3500/set shipped. Mine are $3450 + $400 (for machining to accept my star center caps). They also told me that it's about $1k if you need to replace a single wheel at any time.
They also machine their lug holes for their 60degree bolts, but will machine them as stock if you want to keep the stock bolts (which is what I'm thinking).
Looks like the average price of their wheels is about $3500/set shipped. Mine are $3450 + $400 (for machining to accept my star center caps). They also told me that it's about $1k if you need to replace a single wheel at any time.
They also machine their lug holes for their 60degree bolts, but will machine them as stock if you want to keep the stock bolts (which is what I'm thinking).
Ah, that's nice you get to keep you own center caps. My last set of wheels from HRE wasn't able to use center caps and I had to use theirs, basically advertising their logo even more.
Good news about the lugs too as I had to buy more on one occasion.
Looking forward to the install!
So BC Forged is telling me they can't 100% guarantee that the PS4S tires in a 265/35/19 on the new 9-1/2 wide rim will not have any rubbing issues. They did confirm what was mentioned above about Michelins sitting more square than most tires and therefore need slightly more clearances.
He also said he doesn't think it will rub with this setup but can't guarantee it. BTW the above proposed setup is with the +35 offset. He said there really is nowhere to go inward or outward. I mentioned that I run this by some of you guys running the 265's on the front. Any of you have 265 PS4S's on your front? Also, as a reminder, I am running at stock height with no suspension mods.
Wheel and tire fitment is a game of give and take. Bigger is not always better. It's only true to a point, and past that it will actually do more harm than good as there actually is such a thing as going too wide in terms of both wheel and tires. The wider the tire, the greater the parasitic power loss due to rolling resistance and added tire weight, the heavier the steering feel, the greater the tramlining you experience on the road, and the higher the risk of hydroplaning. It also amplifies stress on all steering components and the hubs, though this is more of a sideline issue depending on the car. From a performance perspective, the biggest reason for increasing width is to increase heat resistance. Smaller tires heat up faster and take longer to cool. But there is a flip side to that in that good summer tires need heat to offer peak grip. With excessive tire sizing it just means it's that much harder to get them to temp. At worst case you may not be able to get them there on public roads.
When it comes to actual performance, what matters for grip is the tire compound, not the width. 285 section width Kumho Ecsta PS91 will out perform 315 section width Conti ExtremeContacts without necessarily assuming all of the shortfalls of installing super wide tires. The idea is to install only what you're going to adequately use. This is why I scoff at many many street cars with flared fenders running wheels half again wider than stock with tires 5 sizes larger than they came with. These cars are miserable to drive, handle worse on the road, and are slower than they would be with setups that fit within the stock fenders.
Wheel and tire fitment is a game of give and take. Bigger is not always better. It's only true to a point, and past that it will actually do more harm than good as there actually is such a thing as going too wide in terms of both wheel and tires. The wider the tire, the greater the parasitic power loss due to rolling resistance and added tire weight, the heavier the steering feel, the greater the tramlining you experience on the road, and the higher the risk of hydroplaning. It also amplifies stress on all steering components and the hubs, though this is more of a sideline issue depending on the car. From a performance reason, the biggest reason for increasing width is to increase heat resistance. Smaller tires heat up faster and take longer to cool. But there is a flip side to that in that good summer tires need heat to offer peak grip. With excessive tire sizing it just means it's that much harder to get them to temp. At worst case you may not be able to get them there on public roads.
At least from a performance perspective, what matters for grip is the tire compound, not the width. 285 section width Kumho Ecsta PS91 will out perform 305 section width Conti ExtremeContacts without necessarily assuming all of the shortfalls of installing super wide tires. The idea is to install only what you're going to adequately use. This is why I scoff at many many street cars with flared fenders running wheels half again wider than stock with tires 5 sizes larger than they came with. These cars are miserable to drive, handle worse on the road, and are slower than they would be with setups that fit within the stock fenders.
Many thanx friend! I actually did a search and learned a few things including many of the points you've made! I guess I'm used to the ride with the 305's and it's been so long now that it just seems normal.
So BC Forged is telling me they can't 100% guarantee that the PS4S tires in a 265/35/19 on the new 9-1/2 wide rim will not have any rubbing issues. They did confirm what was mentioned above about Michelins sitting more square than most tires and therefore need slightly more clearances.
He also said he doesn't think it will rub with this setup but can't guarantee it. BTW the above proposed setup is with the +35 offset. He said there really is nowhere to go inward or outward. I mentioned that I run this by some of you guys running the 265's on the front. Any of you have 265 PS4S's on your front? Also, as a reminder, I am running at stock height with no suspension mods.
That was the only rubbing I got at stock ride height with 275/35/19. That was up against the front of the fender liner. Also, at ET32 (3mm spacer on ET35 wheel). While I have no personal experience with your proposed set up, I can tell you that even with a tire 10mm wider I was able to go 3mm further out without rubbing against the fender. I am pretty sure a 265 "runs wide PS4S" should be fine.
What tire in 265/35/19 are they "guaranteeing fitment" with? You could find the exact shoulder to shoulder measurement of said tire and compare to that of the PS4S.
My last post here with my question of clearance running PS4S 265's on the 9-1/2 wide front rim with the 35 offset.
Please, anybody that can confirm that this will be OK based on experience.
I have OEM CLS amg rims, 9.5 front 10 in back. The P4S @ 295 on the 10" looks perfect. I wish these cars could run 10" up front and not stick out. It seems with the 9.5 best fit is a 265 but it looks stretched. No rubbing at any setting.
I am running 20x9.5 31et with 255/30/20 PS4S tires and I should be able to fit 265/30 since there is some clearance. Also I am lowered too.
So you might go 265/30 tires to fit vs 265/35 tires.
Thanks Ed,
If I go with 30 vs 35 in the front isn't my outside diameter getting smaller and thus would affect my speedo and such? Also, thinking it might be a rougher ride?
According to tiresize.com calculator the 265/30 is exactly 1 full inch smaller diameter than the 265/35. I would think this is enough to throw things like speedo and odometer off.
FYI - I'm running 255/35/19 front and 285/30/20 back on my E63. Stock ride height. 19x9 +27 in the front and 20x10 +48 rear. No rubbing as far as I can tell. Not super aggressive as they are factory SL63 wheels
09-30-2019, 05:20 PM
