11-23-2016, 02:08 PM | #1 |
Moderator
618
Rep 10,858
Posts |
BBS RI-D
From conversation with BBS: [note: unsprung weight savings of about 6 lbs. per wheel. That will have significant performance effects. I would personally opt for 235/35 and 265/30 tire sizes]
"BBS-Japan makes an RI-D wheel that should work. They are 20x8.5 et41 & 20x10 et45. Again, this rear, I feel, will be a little aggressive; tire selection will be important. These wheels are listed on their site at 17.4 lbs & 18.5 lbs each for the front and rear respectively. Keep in mind that going to a wider wheel will necessitate a wider tire. A switch from the OE 215/45 & 245/40 to a more sporty/attractive 245/40 & 285/35 will likely add 3 to 4 pound per tire so some of the wheel savings will be undone. A photo of the wheel is attached. They are made in Silver, Diamond Black (as in the photo), & Matte Black. These are special order so current ETAs are not exactly known… If interested I will request this info from BBS-Japan." Robert Way Phone: 770.967.9848 BBS of America, Inc. § http://www.bbs-usa.com/ §
__________________
My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808
my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279 |
11-23-2016, 04:35 PM | #2 | |
Major
712
Rep 1,405
Posts |
Quote:
Also the width of those rims require a 245/40 and 275/35 since the car already brings the 245/40 on the rear all you need is the 275/35 and your are done ! Btw the 10 inch width with a 45 offset will be just fine |
|
Appreciate
0
|
11-24-2016, 09:27 PM | #3 |
Moderator
618
Rep 10,858
Posts |
I agree that fitting the rears on the front and sticking 275/35 on rear would be great.
Key issue is weight reduction. BBS FI-R and DI-R are amazing forged rims.
__________________
My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808
my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279 |
Appreciate
1
MKSixer34190.50 |
11-25-2016, 11:34 AM | #5 |
Lieutenant General
34191
Rep 11,637
Posts
Drives: 2015 BMW i8, E63 M6, 328d
Join Date: Jun 2015
Location: Southeast United States
|
I have 275s on the rear and they look and work perfectly. These wheels look amazing and offer significant weight savings! Huge win!!
__________________
Several actors have played James Bond, Sean Connery IS James Bond...
Sir 7ewis, 7X FIA Formula One World Championship, World Driving Champion. 100 Wins. 101 Pole Positions. 54 Fastest Laps. Actual Rain Master. Leave me to it, Bono. One Race Win in each of his 15 years in F1. Most Laps Led in Formula One. The Centurion. |
Appreciate
0
|
11-25-2016, 04:11 PM | #6 |
Major
320
Rep 1,299
Posts
Drives: 2015 BMW i8
Join Date: Jan 2014
Location: Miami, FL
|
I'm rocking chunky 285s on the rears and still wish they were wider.
__________________
2015 BMW i8 in Matte Metallic Grey:
H&R Springs 21" ADV.1 ADVNL2 MV2 CS Wheels Coming Soon: 2016 BMW M4 GTS De-Winged and Bagged on 22s |
Appreciate
1
MKSixer34190.50 |
11-26-2016, 09:12 AM | #7 |
Major
712
Rep 1,405
Posts |
Correct on the same boat here, the truth of the matter here is that 14-16 pounds in weight reduction is not going to do great things. In fact won't do anything IMO but going with your set up 235 & 265 you will continue to have the narrow tire syndrome (that looks horrible on this platform) and no to mention traction problems... But hey to each his own enjoy !
|
Appreciate
1
MKSixer34190.50 |
11-26-2016, 09:35 AM | #8 | |
Lieutenant General
34191
Rep 11,637
Posts
Drives: 2015 BMW i8, E63 M6, 328d
Join Date: Jun 2015
Location: Southeast United States
|
Quote:
http://www.tuneruniversity.com/blog/...t-people-down/
__________________
Several actors have played James Bond, Sean Connery IS James Bond...
Sir 7ewis, 7X FIA Formula One World Championship, World Driving Champion. 100 Wins. 101 Pole Positions. 54 Fastest Laps. Actual Rain Master. Leave me to it, Bono. One Race Win in each of his 15 years in F1. Most Laps Led in Formula One. The Centurion. |
|
Appreciate
0
|
11-26-2016, 10:37 AM | #9 | ||
Captain
474
Rep 687
Posts
Drives: Ferrari 458, BMW i8, Acura NSX
Join Date: Aug 2016
Location: Scottsdale/Pittsburgh
|
Quote:
in reality I believe these wheels may save closer to 30-35 pounds (maybe 25 factoring in tires) which is pretty massive. Should translate to performance gains worth close to 100 pounds of weight savings above the wheel |
||
Appreciate
1
MKSixer34190.50 |
11-26-2016, 01:42 PM | #10 | ||
Major
712
Rep 1,405
Posts |
Quote:
|
||
Appreciate
0
|
11-26-2016, 03:36 PM | #11 | |
Lieutenant General
34191
Rep 11,637
Posts
Drives: 2015 BMW i8, E63 M6, 328d
Join Date: Jun 2015
Location: Southeast United States
|
Quote:
The information I posted says different as do the laws of physics. Reducing the amount of unsprung mass (Which is what the brakes, wheels, and tires are in street cars, improves performance by lowering the effort necessary to change any parameter from it's state at a given moment in time. In cars with identical performance but fitted with a different wheel/tire combinations, the car with the lighter wheel/tire combination will fare better in overall performance. That is a quick and dirty explanation of the phenomenon. If you want detailed information, I can provide articles from Race Car Engineering that will provide you with more math than than you bargained for. Cheers-mk
__________________
Several actors have played James Bond, Sean Connery IS James Bond...
Sir 7ewis, 7X FIA Formula One World Championship, World Driving Champion. 100 Wins. 101 Pole Positions. 54 Fastest Laps. Actual Rain Master. Leave me to it, Bono. One Race Win in each of his 15 years in F1. Most Laps Led in Formula One. The Centurion. |
|
Appreciate
0
|
11-26-2016, 06:49 PM | #12 | |
Moderator
618
Rep 10,858
Posts |
Correct.
Quote:
__________________
My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808
my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279 |
|
Appreciate
1
MKSixer34190.50 |
11-26-2016, 09:20 PM | #13 | ||
Major
712
Rep 1,405
Posts |
Quote:
|
||
Appreciate
1
MKSixer34190.50 |
11-27-2016, 10:27 AM | #14 | |
Moderator
618
Rep 10,858
Posts |
Ahhh, that explains it. Yes I agree that the 1 lbs. difference btw 235 / 265 versus 245 / 275 would not be significant, and a tradeoff with the potential increase in performance from the wider tires. That we all agree on. Likewise, we all agree that 18 lbs. rims would be a significant performance upgrade over the stock rims. Much more so than the 18 lbs. reduction from the titanium exhaust, for example.
Mind you, most weight reduction mods for the i8 are $$$. A set of BBS forged would set you back $8k or more. I wish BMW had fitted them stock, as they would make great sense for this car. Quote:
__________________
My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808
my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279 |
|
Appreciate
1
MKSixer34190.50 |
11-27-2016, 11:22 AM | #15 | ||
Captain
474
Rep 687
Posts
Drives: Ferrari 458, BMW i8, Acura NSX
Join Date: Aug 2016
Location: Scottsdale/Pittsburgh
|
Quote:
|
||
Appreciate
0
|
11-29-2016, 09:14 AM | #16 | |
Moderator
618
Rep 10,858
Posts |
Quote:
We should develop a concerted effort here to lobby BMW Performance to offer products like this for the i8. We may be a tiny group, but the i8 is the flagship for BMW's future, and we are highly motivated to improve our i8s.
__________________
My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808
my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279 |
|
Appreciate
0
|
11-30-2016, 01:55 PM | #17 | |
Lieutenant Colonel
621
Rep 1,646
Posts |
Quote:
|
|
Appreciate
0
|
02-03-2022, 09:21 PM | #18 |
Private First Class
24
Rep 173
Posts |
that is because most stockers, like 625 wheels are about 24-25 lbs per wheel. but be careful, if you go with any tire other than the stock 215 and 245 S001s which are especially light tires, you can take that 6 away and add another 2-3 lbs more per tire, easily (even if the tire is the same exact size). I get this info from Tirerack.com by clicking around on specifications. You can see tire weights.
Last edited by mws; 02-04-2022 at 07:11 PM.. |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|