Aftermarket Wheels?

[h_bakken]

Apologize for previous post (deleted)

I had reversed the explanation for the front wheels!

So this is what I am thinking of ordering (pic below)

19 x 9.5 ET22 with 275/30 tires front.
19x 10.5 ET45 with 305/30 tires rear.

If you go to the 19 x 10 ET25 front you need 5mm spacer and might need negative camber.

The 19 x 11 ET44 rear wheel is only available in SM10 style and there is no ET22 in SM10.

[SYT_Shadow]

I would definitely go with the 5mm spacer to enable the 10" option.

BMWs have engines up front. You want as much wheel/tire as possible there

The EC7 design is too heavy

[h_bakken]

Originally Posted by SYT_Shadow

I would definitely go with the 5mm spacer to enable the 10" option.

BMWs have engines up front. You want as much wheel/tire as possible there

The EC7 design is too heavy

I would prefer to have the 10" wheel but don't have camber plates, so might compromise just to get a dedicated track setup, otherwise I will be running the 666 with Cup 2 on my first track day which might happen anyway due to availability.

Also the SM-10 is about the same weight and is the only Apex option for 19 x 10 front, 19 x 11 rear at least at this time. This is what Apex recommended with the caveat that I would need a front spacer and could run into fender clearance issues since I don't have camber plates.

A friend of mine has a set of 19 x 10.5 ET22 rear and 19 x 10 ET25 front in ARC-8 style, might see if we can do a test fit (would need 20mm rear spacer).

When I get things figured out I will post back

[SYT_Shadow]

Originally Posted by h_bakken

I would prefer to have the 10" wheel but don't have camber plates, so might compromise just to get a dedicated track setup, otherwise I will be running the 666 with Cup 2 on my first track day which might happen anyway due to availability.

Also the SM-10 is about the same weight and is the only Apex option for 19 x 10 front, 19 x 11 rear at least at this time. This is what Apex recommended with the caveat that I would need a front spacer and could run into fender clearance issues since I don't have camber plates.

A friend of mine has a set of 19 x 10.5 ET22 rear and 19 x 10 ET25 front in ARC-8 style, might see if we can do a test fit (would need 20mm rear spacer).

When I get things figured out I will post back

If you are buying a dedicated track setup you don't have a choice regarding camber plates. You need them. So you might as well get them now and be able to run proper wheels.

You would do much better with OEM wheels and camber plates than a 'track setup' without them.

Apex is notoriously conservative with their fitment guides.

Careful with your example of the ARC8 wheels. The ET22 rear wheel is way too aggressive for the F8X. The 10.5 fitment should be ET36 or ET40 and the 11 fitment is ET44. A 10.5ET22 wheel won't work with wide tires. You also cannot correct aggressive wheel offsets with a spacer.
Low ET = the wheel it towards the 'outside' of the car. So if you have a ET22 wheel and you add a 10mm spacer you now have a ET12 wheel which doesn't work at all.

[h_bakken]

Originally Posted by SYT_Shadow

If you are buying a dedicated track setup you don't have a choice regarding camber plates. You need them. So you might as well get them now and be able to run proper wheels.

You would do much better with OEM wheels and camber plates than a 'track setup' without them.

Apex is notoriously conservative with their fitment guides.

This makes sense.

Looks like Ground Control still selling the GTS plates.

How difficult are they to install?

[SYT_Shadow]

Originally Posted by h_bakken

This makes sense.

Looks like Ground Control still selling the GTS plates.

How difficult are they to install?

Pretty easy. You drop the suspension and put the plate up top, then get it aligned. A shop can also do it

If you do it yourself, make sure to start by covering the positive terminal in the engine bay with tape. It's in the perfect position to short out with a wrench and fry your ECU

[h_bakken]

Originally Posted by SYT_Shadow

If you are buying a dedicated track setup you don't have a choice regarding camber plates. You need them. So you might as well get them now and be able to run proper wheels.

You would do much better with OEM wheels and camber plates than a 'track setup' without them.

Apex is notoriously conservative with their fitment guides.

Careful with your example of the ARC8 wheels. The ET22 rear wheel is way too aggressive for the F8X. The 10.5 fitment should be ET36 or ET40 and the 11 fitment is ET44. A 10.5ET22 wheel won't work with wide tires. You also cannot correct aggressive wheel offsets with a spacer.
Low ET = the wheel it towards the 'outside' of the car. So if you have a ET22 wheel and you add a 10mm spacer you now have a ET12 wheel which doesn't work at all.

Ahhh this makes sense, thank you!

I knew my thinking was not right. So there is no way the wheels that my friend has would work, that is helpful!

[SYT_Shadow]

Originally Posted by h_bakken

Ahhh this makes sense, thank you!

I knew my thinking was not right. So there is no way the wheels that my friend has would work, that is helpful!

happy to help. I track a lot and have a massive collection of wheels, camber plates, BBK, etc

[phoenx]

Originally Posted by SYT_Shadow

The 19" ones do

Front 10.5 fitment may be an issue with stock KW suspension

Thanks!

[h_bakken]

Originally Posted by SYT_Shadow

If you are buying a dedicated track setup you don't have a choice regarding camber plates. You need them. So you might as well get them now and be able to run proper wheels.

You would do much better with OEM wheels and camber plates than a 'track setup' without them.

Apex is notoriously conservative with their fitment guides.

Careful with your example of the ARC8 wheels. The ET22 rear wheel is way too aggressive for the F8X. The 10.5 fitment should be ET36 or ET40 and the 11 fitment is ET44. A 10.5ET22 wheel won't work with wide tires. You also cannot correct aggressive wheel offsets with a spacer.
Low ET = the wheel it towards the 'outside' of the car. So if you have a ET22 wheel and you add a 10mm spacer you now have a ET12 wheel which doesn't work at all.

Thanks again for the advice. Was trying to wrap my head around this and finally thought hey, the spacer is part of the wheel, not part of the hub.

I'm sure there are a lot of people who would argue all night about this but it makes sense to me when I think of it this way.

I am going to end up with camber plates after all, want to do it right.

[Boostin FD]

Anyone here with the CF 681M Wheels? I found a set for "decent" price... I know these were an option for the GTS because of its lightness... just not sure how they would look on a white GTS...

I had Carbon Fiber wheels on my GT350R and although they are beautiful, the fact that if you curb them by accident, you're out of $5k for each HA!

I found this thread with some pics of them, if you're not familiar what they look like: https://f80.bimmerpost.com/forums/sh....php?t=1426197

EDIT: I found this old ad as well... I'm not sure i'm digging this look...

https://www.lamborghinidallas.com/us...d38df20f95.htm

[h_bakken]

Originally Posted by Boostin FD

Anyone here with the CF 681M Wheels? I found a set for "decent" price... I know these were an option for the GTS because of its lightness... just not sure how they would look on a white GTS...

I had Carbon Fiber wheels on my GT350R and although they are beautiful, the fact that if you curb them by accident, you're out of $5k for each HA!

I found this thread with some pics of them, if you're not familiar what they look like: https://f80.bimmerpost.com/forums/sh....php?t=1426197

EDIT: I found this old ad as well... I'm not sure i'm digging this look...

https://www.lamborghinidallas.com/us...d38df20f95.htm

Obviously personal taste, but I do not like the way the BMW CF wheels look, not organic at all.

That being said anything you can reduce unsprung weight is generally good.

Also thanks to Lambo Dallas for supporting M4 GTS prices

[dh3622]

Here's a previous thread where M4 GTS owners were experiencing 'scoring' issues with the front 19" CF wheels.

https://f80.bimmerpost.com/forums/sh....php?t=1466182

From memory, 20" CF wheels (front and back) were, or are still, not a problem on the M4 GTS.

[4play]

I would much rather have BBS FI-Rs. Look way better and are actually lighter than the M CF wheels.

Stock GTS wheels weigh just over 104lb total. Carbon GTS wheels are just under 90lb total.

FI-R in OEM GTS size are 68lb (!) - an enormous weight savings. FI-R are 20 pounds lighter than the 681M carbon wheels, can be repaired, and are generally cheaper.

[Boostin FD]

Originally Posted by dh3622

Here's a previous thread where M4 GTS owners were experiencing 'scoring' issues with the front 19" CF wheels.

https://f80.bimmerpost.com/forums/sh....php?t=1466182

From memory, 20" CF wheels (front and back) were, or are still, not a problem on the M4 GTS.

I've seen that. That's a whole different issue because of the calipers being so large... Happens with the GT350R as well. The little rock or pebble gets trapped between the caliper and the wheel and there goes $5k HA!

I've looked at a lot of pictures... they're just plain ugly looking wheels. So, pass! I understand the point of them and all... but i'm a poser... i prefer looks over function

[Boostin FD]

Originally Posted by 4play

I would much rather have BBS FI-Rs. Look way better and are actually lighter than the M CF wheels.

Stock GTS wheels weigh just over 104lb total. Carbon GTS wheels are just under 90lb total.

FI-R in OEM GTS size are 68lb (!) - an enormous weight savings. FI-R are 20 pounds lighter than the 681M carbon wheels, can be repaired, and are generally cheaper.

Yeah, I understand... but you're talking NEW to NEW comparison... I wouldn't pay $8k for a set of rims... I'm not that rich. I found a whole set of these for fraction of what the new set would cost... so i thought... maybe i'd get them. But pass. They butt ugly HA!

[THEROK]

Originally Posted by 4play

I would much rather have BBS FI-Rs. Look way better and are actually lighter than the M CF wheels.

Stock GTS wheels weigh just over 104lb total. Carbon GTS wheels are just under 90lb total.

FI-R in OEM GTS size are 68lb (!) - an enormous weight savings. FI-R are 20 pounds lighter than the 681M carbon wheels, can be repaired, and are generally cheaper.

Bingo.

Wheels should be assessed not by weight alone, but also stiffness and strength. BBS FI-Rs are at the top of the food chain not only in mass (reduction of), but in radial/axial deflection and durability. Heck, Bugatti OEMs them for the multi-million euro Chiron.

$8K might seem like a higher-ish priced ticket to get in the game (imho, it really isn't given how much HRE charges for what little motorsport R&D they have in-house), but consider resale value and 2nd hand demand which definitely weigh in on the buying equation. I bought my set at $8.2K new and sold it years later for $6K cash lickety-split.

[786]

Originally Posted by Boostin FD

Anyone here with the CF 681M Wheels? I found a set for "decent" price... I know these were an option for the GTS because of its lightness... just not sure how they would look on a white GTS...

I had Carbon Fiber wheels on my GT350R and although they are beautiful, the fact that if you curb them by accident, you're out of $5k for each HA!

I found this thread with some pics of them, if you're not familiar what they look like: https://f80.bimmerpost.com/forums/sh....php?t=1426197

EDIT: I found this old ad as well... I'm not sure i'm digging this look...

https://www.lamborghinidallas.com/us...d38df20f95.htm

The PO of my car got them as an option and wanted a higher price due to them being included. I find them hideous so I told him to keep the cf wheels and give me a better price on the car. Much better options out there man.

Originally Posted by 4play

I would much rather have BBS FI-Rs. Look way better and are actually lighter than the M CF wheels.

Stock GTS wheels weigh just over 104lb total. Carbon GTS wheels are just under 90lb total.

FI-R in OEM GTS size are 68lb (!) - an enormous weight savings. FI-R are 20 pounds lighter than the 681M carbon wheels, can be repaired, and are generally cheaper.

Agreed. I’ve been thinking about a 19” FI-R setup, any idea the weight savings vs standard oem wheels?

[4play]

Originally Posted by Boostin FD

Yeah, I understand... but you're talking NEW to NEW comparison... I wouldn't pay $8k for a set of rims... I'm not that rich. I found a whole set of these for fraction of what the new set would cost... so i thought... maybe i'd get them. But pass. They butt ugly HA!

Even used to used. There is a set of FI-Rs (or was) floating around here with brand new PS4S for $6500. Even if you want the FI-Rs as a track wheel and would swap the tires off, the net value of the PS4S knocks the wheel price down to ~$5500.

The FI-Rs are (to me) better in every way. Repairable if you bend them, lighter, look better (admittedly subjective), cheaper, and easier to source a replacement if you really mess one up.

That said, if you find carbon 681Ms for like $4k, why not? It's the only real option these cars had (aside from paint) here in the US.

Originally Posted by 786

The PO of my car got them as an option and wanted a higher price due to them being included. I find them hideous so I told him to keep the cf wheels and give me a better price on the car. Much better options out there man.

Agreed. I’ve been thinking about a 19” FI-R setup, any idea the weight savings vs standard oem wheels?

Just over 36 pounds vs the OEM GTS wheels in identical sizing. They are just unbelievably light. The 19x9.5" fronts weigh 16.5 lbs each! Next mod after I sell my carbon brake spares and the "neon daily driver" lower splitters.