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KEEP M3POST ALIVE BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER LINK! |
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11-23-2014, 10:37 PM | #1 |
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Custom wheels in OEM ZCP sizes: Crazy idea?
I absolutely love the OEM ZCP wheels, especially with Michelin PSS in 255/35-19 and 275/35-19. That said, I was not a huge fan of having to run spacers (15 mm front; 10 mm rear) to get them to sit fairly flush. (Among other things, I did not want to add another task to my track prep.) I'd also love to save some weight if possible.
I've been considering getting a set of HRE P40SC monobloc wheels. My original thought was to do something like 19 x 9.5" et 22 and 19 x 10.5" et 27, and run Michelin PSS in 275/30-19 and 295/35-19. Of course, this would mean running slightly heavier, more expensive tires with a slightly shorter sidewall than I was running on the ZCPs. I also wonder how much the 275 would numb the steering relative to my old 255 setup. Then it hit me: Could I do the P40SCs in 9" front and 10" rear like the ZCP wheels, but with more aggressive offsets? Something like 19 x 9" et 15 front and 19 x 10" et 15 rear? (This would be virtually identical to the effective offset that I was running with my ZCP wheels and 15/10 mm spacers.) The advantages would be lighter overall wheels and tires, slightly less expensive tires, taller sidewalls, and the same steering precision as I had with the ZCPs. Basically, I would end up with lighter, stronger, and flush versions of the ZCPs but without the need for spacers. Am I nuts for considering this? Last edited by Hujan; 11-23-2014 at 11:55 PM.. |
11-23-2014, 11:10 PM | #2 |
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I run zcp size wheels on stock zip tire sizes with no rub, 19x9 ET 20 and 19x10 ET25. On the fronts, not sure if you could push it much farther than ET20, rears may have a bit more room. If you can the lower offset in the front, it is like running spacers and helps dial out some of the understeer, you can definitely feel 10mm. Will probably move to 255/35 and 275/35 tire combo as my rims seem to run a tad wider than ZCP and probably can get away with it with PSSs as seem to run narrow.
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11-23-2014, 11:53 PM | #3 | |
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I should have mentioned in my OP that I was running 15 mm spacers on the front and 10 mm on the rear with my ZCPs, no rubbing. My question was less of a, "Would it work?" and more of a "Would it be crazy to buy a set of HREs in ZCP sizes (but not offsets)?" I edited the OP to eliminate the confusion. That's my bad. |
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11-24-2014, 12:08 AM | #4 | |
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Got it and good to know it doesn't rub with those size spacers.
Doesn't sound crazy at all if you feel it improves performance/feel (which I think it does from my own increasing offsets while reducing unsprung weight) and much better to have the spacer effectively "built" into the wheel for weight and less vibration potential. It sounds like you're implying that maybe you should instead run wider wheels instead of ZCP sizes. Another member pointed out this handy contact patch calculator where you can input different parameters for wheels/tires to get the optimal theoretical contact patch size. Playing around with it, I found that oftentimes what you think adds contact area actually doesn't. Pretty interesting and may help narrow down your answer. http://bndtechsource.ucoz.com/index/...alculator/0-20 Quote:
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11-24-2014, 12:42 PM | #5 |
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My last couple of HRE sets were zcp sizes, et20. Just slightly more aggressive without going full bulldog. I liked the setup, looked and felt great with stock size tires.
I love the ZCP's too, I'm just running stock right now. HRE's aren't gnawing at me...at the moment. Go for it, get those puppies made to your liking. |
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11-24-2014, 01:25 PM | #6 | |
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I'm running 9.5" front (22) and 11" rear (27) if I'm not mistaken, and with bigger tires, they still weigh roughly the same as OEM setup. I went from OEM sized PSS to 295 rears and the amount of traction increase is awesome. Looking to go 275 up front eventually. So keep that in mind. Personally, I'm a sucker for a nice aggressive setup
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11-24-2014, 02:11 PM | #7 | |||
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I didn't mention it in my OP, but my goal is to shed as much weight from the car as possible without sacrificing too much (or any) in the way of comfort and performance. Lighter exhaust, brakes, wheels, maybe a battery, seats, etc. |
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11-24-2014, 03:27 PM | #8 | |
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The way my car is riding, it's still very comfortable (and I do have Swift springs). I wish I was able to give you a ride to give you a better idea. Well you are in San Diege, maybe there are some members with my kind of a setup that you can meet up with?
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11-24-2014, 04:49 PM | #9 | |
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11-24-2014, 10:42 PM | #10 |
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Do a search for the RAC RG63 wheels on this forum. They are 19x9 and 19x10. Same as stock but the offsets are et22 front and rear. They are 8,000 TON forged by the same manufacturer of Ferarri, Neez, and Champion wheels. Extremely high quality and very lightweight. They were produced in very limited numbers for members of this forum a few years back but pop up for sale every once in a while. I have a set and LOVE them. They are wearing 255/35 and 275/35 just like you are looking to run.
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11-25-2014, 09:43 AM | #13 | |
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11-25-2014, 11:13 AM | #14 |
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The concave on the HRE looks so aggressive, on a scale I haven't seen on another aftermarket mesh wheel.
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11-26-2014, 02:40 PM | #15 | |
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I am getting mixed information on the grip benefits. The online calculator linked to above suggests that although a 295/30 Pilot Super Sport on 10.5" wheel has a larger contact patch than a 275/30 PSS on a 10" wheel, the 255/35 PSS on a 9" wheel has a larger contact patch than 275/30 PSS on a 9.5" wheel. If that's true, the grippiest PSS setup would be 255/35 on 9" front with 295/30 on 10.5" rear. As I think about it more, my biggest hesitation is with the 275/30 and 295/30 setup would be increased harshness from the shorter sidewalls. They are actually shorter than the OEM 245/35 and 265/35 setup. If the ride is noticeably harsher, I'd be willing to give up the increased grip. Or maybe I should run 18" wheels on the street? Sigh. |
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