BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW M5 F90 (2018+) General Forums Wheels | Tires | Suspension | Brakes | Chassis    Toyo square set up

Post Reply
 
Thread Tools Search this Thread
      02-09-2019, 10:35 PM   #1
dk79
First Lieutenant
United_States
84
Rep
346
Posts

Drives: 2018 F90 M5 Marina bay blue
Join Date: Feb 2013
Location: Gilbert, AZ

iTrader: (0)

Question Toyo square set up

Can I run toyo r888r 285/35/20 on all 4 wheels?
Have trouble getting grip on all 4 at the dragstrip with launch.
Best time was 10.9 at 128mph.
Will this setup give better 1/4 mile time than stock Michelin?
I have racechip and car spins at launch.
Appreciate 0
      02-09-2019, 10:51 PM   #2
Pimpsy
Captain
418
Rep
862
Posts

Drives: 2019 M5C
Join Date: Jan 2012
Location: NJ

iTrader: (0)

I am running a 285/35/20 square set up for winter. No problems, feel super solid.
__________________
Retired 2016 BMW 550i xDrive MSport | 2013 BMW 550i xDrive MSport | 2012 BMW 535i xDrive | 1988 BMW 325ic | 1984 BMW 318i
Appreciate 0
      02-10-2019, 07:43 AM   #3
apsuard
Captain
193
Rep
612
Posts

Drives: 2021 BMW M5 Competition
Join Date: Jan 2013
Location: Minneapolis, MN

iTrader: (0)

Why not run 285/35 front and 305/35 rear?
Appreciate 0
      02-10-2019, 08:28 AM   #4
Miko M
///M
Miko M's Avatar
United_States
6649
Rep
3,683
Posts

Drives: 2020 M2C. 2020 X3M
Join Date: May 2018
Location: Wisconsin

iTrader: (0)

Quote:
Originally Posted by apsuard View Post
Why not run 285/35 front and 305/35 rear?
+1
This is the setup I will go most likely
Not sure about r888r they won't last one season dough
__________________
Life is too short...enjoy your life
///M
Appreciate 1
M 4EVER191.00
      02-10-2019, 08:55 AM   #5
M4LAKA
Lieutenant
Canada
91
Rep
420
Posts

Drives: 2022 M5 Comp
Join Date: May 2014
Location: Toronto

iTrader: (0)

Quote:
Originally Posted by apsuard View Post
Why not run 285/35 front and 305/35 rear?
Will this fit?
__________________
Currently:
2022 M4 Comp xDrive
2022 M5 Comp

Past:
2019 M5 Comp
2015 M4
Appreciate 0
      02-10-2019, 09:55 AM   #6
dk79
First Lieutenant
United_States
84
Rep
346
Posts

Drives: 2018 F90 M5 Marina bay blue
Join Date: Feb 2013
Location: Gilbert, AZ

iTrader: (0)

285 front 305 rear is something I want but dont want to damage the differential since car is awd and rolling diameter has to be close.
Appreciate 1
      02-10-2019, 09:56 AM   #7
dk79
First Lieutenant
United_States
84
Rep
346
Posts

Drives: 2018 F90 M5 Marina bay blue
Join Date: Feb 2013
Location: Gilbert, AZ

iTrader: (0)

Will use toyo on diff rims just for the drag days.
Appreciate 0
      02-10-2019, 10:14 AM   #8
dk79
First Lieutenant
United_States
84
Rep
346
Posts

Drives: 2018 F90 M5 Marina bay blue
Join Date: Feb 2013
Location: Gilbert, AZ

iTrader: (0)

Between 285/35/20 and 305/35/20 the rolling diameter difference is 1.8% . For all wheel drive system it has to be under 1%.
Appreciate 1
      02-10-2019, 11:20 AM   #9
Miko M
///M
Miko M's Avatar
United_States
6649
Rep
3,683
Posts

Drives: 2020 M2C. 2020 X3M
Join Date: May 2018
Location: Wisconsin

iTrader: (0)

Quote:
Originally Posted by dk79 View Post
Between 285/35/20 and 305/35/20 the rolling diameter difference is 1.8% . For all wheel drive system it has to be under 1%.
I will most likely go with that size. It is measured 1.8% but the stocks are off too. They don't run square either. So from 275 front and 285 backside already off by 1.1%
So in reality you are off by .7% from stock
__________________
Life is too short...enjoy your life
///M
Appreciate 0
      02-10-2019, 11:22 AM   #10
Miko M
///M
Miko M's Avatar
United_States
6649
Rep
3,683
Posts

Drives: 2020 M2C. 2020 X3M
Join Date: May 2018
Location: Wisconsin

iTrader: (0)

Quote:
Originally Posted by M4LAKA View Post
Quote:
Originally Posted by apsuard View Post
Why not run 285/35 front and 305/35 rear?
Will this fit?
Not on stock rims , you should do different rim size. I got mine ordered 10" wide up front and 11" wide in the back
__________________
Life is too short...enjoy your life
///M
Appreciate 0
      02-10-2019, 11:50 PM   #11
brad850csi
Colonel
1310
Rep
2,349
Posts

Drives: 16 F13 M6 Comp
Join Date: Jan 2015
Location: Auckland, New Zealand

iTrader: (0)

A factory option for winters is 265/40r19 and 285/40r20. So running 285/35r20 and 305/35r20 is absolutely fine for the transfer case.

Next, the stock wheels are 9.5" and 10.5" wide. The R888R 285/35r20 can run on 9.5" to 11" and the 305/35r20 is rated for 10" to 12"

So there is absolutely no problems at all running those sizes.
__________________
SCOTT26 "So as an admirer of the M5 and a potential customer of an M5 Touring. I would run naked around the streets of Garching if they were to offer one."
Appreciate 0
      02-11-2019, 10:00 AM   #12
Miko M
///M
Miko M's Avatar
United_States
6649
Rep
3,683
Posts

Drives: 2020 M2C. 2020 X3M
Join Date: May 2018
Location: Wisconsin

iTrader: (0)

Quote:
Originally Posted by brad850csi View Post
A factory option for winters is 265/40r19 and 285/40r20. So running 285/35r20 and 305/35r20 is absolutely fine for the transfer case.

Next, the stock wheels are 9.5" and 10.5" wide. The R888R 285/35r20 can run on 9.5" to 11" and the 305/35r20 is rated for 10" to 12"

So there is absolutely no problems at all running those sizes.
I just know that r888r are running wider then most tires. It would probably fit but I still think 11" wide would be better choice
__________________
Life is too short...enjoy your life
///M
Appreciate 0
      03-31-2019, 09:48 PM   #13
shawnhayes
Major
1816
Rep
1,304
Posts

Drives: 22M5 CS,23X5E,24M3 CS,24 i4
Join Date: Aug 2015
Location: Virginia

iTrader: (0)

Fits fine on OEM wheels. No spacers. No rubbing.

These were my favorite track tires on my GT-R before I traded it in on this M5. Strangely enough, the rear tire is also the EXACT same size as the rear tire on the GT-R, 2009-present.

The GT-R world has a LOT of experience matching the front and rear tires. The GT-R's transfer case will basically self destruct at high power of the front/rear outer diameter is a bad match. But sizes are basically unreliable. Either square or a rollout is required to be absolutely certain.

Even though the outer diameter is SLIGHTLY different on square tires on different width rims (OEM's are different in this M5), it was not different enough on the GT-R to blow the transfer case and the front rim and rear rim were a full inch different. So this should be fine. My testing so far is perfect. But I take it to track next week. Here ya go...
Attached Images
  
Appreciate 1
      04-01-2019, 10:33 AM   #14
devondragon
Lieutenant
devondragon's Avatar
United_States
153
Rep
427
Posts

Drives: 2019 M5 Competition
Join Date: Oct 2011
Location: Boulder, CO

iTrader: (0)

Garage List
Sexy!
Appreciate 0
      04-14-2019, 07:35 AM   #15
shawnhayes
Major
1816
Rep
1,304
Posts

Drives: 22M5 CS,23X5E,24M3 CS,24 i4
Join Date: Aug 2015
Location: Virginia

iTrader: (0)

They did pretty well on the track, but heated up a great deal from cold temps and were hard to predict final pressures.

They also got pretty greasy when they got hot...

Like this...


But this is heavy duty track work at VIR. Not your normal driving.

Shawn
Attached Images
 
Appreciate 0
      04-17-2019, 06:05 AM   #16
Kstadt911
Enlisted Member
15
Rep
33
Posts

Drives: M3 CP, 911 turbo, F90 M5C
Join Date: Sep 2016
Location: south florida

iTrader: (0)

Quote:
Originally Posted by shawnhayes View Post
They did pretty well on the track, but heated up a great deal from cold temps and were hard to predict final pressures.

They also got pretty greasy when they got hot...

Like this...


But this is heavy duty track work at VIR. Not your normal driving.

Shawn
Thanks for great info. So are you happy going with R888s for M5 and Any other track tire to consider? Are you using one set of stock wheels and dismounting back to street tires between track events?

Also, did you change to SRF and how did rotors and pads fare?

What other street or track cars did you surprise at VIR with your M5?
Appreciate 0
      04-17-2019, 12:25 PM   #17
shawnhayes
Major
1816
Rep
1,304
Posts

Drives: 22M5 CS,23X5E,24M3 CS,24 i4
Join Date: Aug 2015
Location: Virginia

iTrader: (0)

Quote:
Originally Posted by Kstadt911 View Post
Quote:
Originally Posted by shawnhayes View Post
They did pretty well on the track, but heated up a great deal from cold temps and were hard to predict final pressures.

They also got pretty greasy when they got hot...

Like this...


But this is heavy duty track work at VIR. Not your normal driving.

Shawn
Thanks for great info. So are you happy going with R888s for M5 and Any other track tire to consider? Are you using one set of stock wheels and dismounting back to street tires between track events?

Also, did you change to SRF and how did rotors and pads fare?

What other street or track cars did you surprise at VIR with your M5?
Although the R888's stood up to the track wear better than the 4S's, final pressures were very hard to get right, and the tires overheated and were too greasy after 35 minutes on track (just like on my old GT-R). Overall they are a great tire. My next tire will be the Pilot Sport cup 2's, also in 285/35R20 square setup.

All in all, if I were going to do just track work extensively, I'd stick with the R888's, but I have about six events per year. Unless the Pilot Sport Cup's outperform the R888's on overheating I will probably go back to the stock tire. Despite having A LOT of rollover and giving up a fair amount of grip, they are very controllable and pretty fast.

I did change to SRF. The pedal still faded some, but I think we have "brake fade compensation". I felt the car correct some of the pedal height while braking. The front pads last six full track days without making the wear sensors. I have now worn OUT, two full sets of rear pads. On my third set, I turned off DSC to conserve pads. The car is pretty good without DSC, and not as hard to control as I thought it might be.

The biggest surprise was probably to the Porsche cayman's. I think they were surprised that I was able to not only keep up but pass. Especially in the turns. But I was in some really fast groups.

Shawn
Appreciate 0
      04-18-2019, 06:08 AM   #18
Kstadt911
Enlisted Member
15
Rep
33
Posts

Drives: M3 CP, 911 turbo, F90 M5C
Join Date: Sep 2016
Location: south florida

iTrader: (0)

Quote:
Originally Posted by shawnhayes View Post
Although the R888's stood up to the track wear better than the 4S's, final pressures were very hard to get right, and the tires overheated and were too greasy after 35 minutes on track (just like on my old GT-R). Overall they are a great tire. My next tire will be the Pilot Sport cup 2's, also in 285/35R20 square setup.

All in all, if I were going to do just track work extensively, I'd stick with the R888's, but I have about six events per year. Unless the Pilot Sport Cup's outperform the R888's on overheating I will probably go back to the stock tire. Despite having A LOT of rollover and giving up a fair amount of grip, they are very controllable and pretty fast.

I did change to SRF. The pedal still faded some, but I think we have "brake fade compensation". I felt the car correct some of the pedal height while braking. The front pads last six full track days without making the wear sensors. I have now worn OUT, two full sets of rear pads. On my third set, I turned off DSC to conserve pads. The car is pretty good without DSC, and not as hard to control as I thought it might be.

The biggest surprise was probably to the Porsche cayman's. I think they were surprised that I was able to not only keep up but pass. Especially in the turns. But I was in some really fast groups.

Shawn
Interesting about rear pads as fronts usually take bigger hit with heavy front engined car. Nice to hear rotors holding up though ... assume steels on yours, this is what I opted for too. Curious did you get the BMW maintenance package and does it cover pads and rotors? Appreciate all your info, as these cars deserve a healthy dose of track days. My M5C on order so just planning ahead ...

BTW, VIR long back straight should have had you passing more than just Caymans. I enjoy surprising lots 911s and Caymans including GTS and 4, with M3 CP so hoping M5C will be same or better. Especially our tracks with longer straights like Daytona and Sebring where 600+ hp comes in handy.
Appreciate 0
      04-18-2019, 06:41 AM   #19
shawnhayes
Major
1816
Rep
1,304
Posts

Drives: 22M5 CS,23X5E,24M3 CS,24 i4
Join Date: Aug 2015
Location: Virginia

iTrader: (0)

Quote:
Originally Posted by Kstadt911 View Post
Quote:
Originally Posted by shawnhayes View Post
Although the R888's stood up to the track wear better than the 4S's, final pressures were very hard to get right, and the tires overheated and were too greasy after 35 minutes on track (just like on my old GT-R). Overall they are a great tire. My next tire will be the Pilot Sport cup 2's, also in 285/35R20 square setup.

All in all, if I were going to do just track work extensively, I'd stick with the R888's, but I have about six events per year. Unless the Pilot Sport Cup's outperform the R888's on overheating I will probably go back to the stock tire. Despite having A LOT of rollover and giving up a fair amount of grip, they are very controllable and pretty fast.

I did change to SRF. The pedal still faded some, but I think we have "brake fade compensation". I felt the car correct some of the pedal height while braking. The front pads last six full track days without making the wear sensors. I have now worn OUT, two full sets of rear pads. On my third set, I turned off DSC to conserve pads. The car is pretty good without DSC, and not as hard to control as I thought it might be.

The biggest surprise was probably to the Porsche cayman's. I think they were surprised that I was able to not only keep up but pass. Especially in the turns. But I was in some really fast groups.

Shawn
Interesting about rear pads as fronts usually take bigger hit with heavy front engined car. Nice to hear rotors holding up though ... assume steels on yours, this is what I opted for too. Curious did you get the BMW maintenance package and does it cover pads and rotors? Appreciate all your info, as these cars deserve a healthy dose of track days. My M5C on order so just planning ahead ...

BTW, VIR long back straight should have had you passing more than just Caymans. I enjoy surprising lots 911s and Caymans including GTS and 4, with M3 CP so hoping M5C will be same or better. Especially our tracks with longer straights like Daytona and Sebring where 600+ hp comes in handy.
I got the standard maintenance package that comes stock. I did not ask about pads. I think that would be disingenuous to expect track use coverage, but it seems thoughtful. Rotors are standing up well.

And yes I have steel. My GT-R ate two full sets of carbon ceramics which was a very expensive event.

Back and front straight of VIR have me moving on for sure, 160 on the back straight. In lower hpde I pass everything, but my last event was Audi club open track (only solo advanced drivers), and most of those cars are on slicks and very hard to close enough in the uphill eases and oak tree to make the pass before the braking zone. While VIR is a power track, the lighting lap times show the twisties make up a lot of ground for any lighter cars. This was borne out my last event. A NSX was very hard to keep up with, and I only passed him because he wanted to follow my line.

All in all, the fastest sedan I've ever driven. The fastest sedan at VIR in the lightning lap ever. But there are faster cars, just not ones you can take the family on vacation in.

Shawn
Appreciate 0
      04-18-2019, 08:53 AM   #20
Kstadt911
Enlisted Member
15
Rep
33
Posts

Drives: M3 CP, 911 turbo, F90 M5C
Join Date: Sep 2016
Location: south florida

iTrader: (0)

Quote:
Originally Posted by shawnhayes View Post

All in all, the fastest sedan I've ever driven. The fastest sedan at VIR in the lightning lap ever. But there are faster cars, just not ones you can take the family on vacation in.

Shawn
Says it all!
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 08:28 PM.




m5post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST