Z4M tire opinions

RBull · 05-21-2010, 05:41 PM

I'm looking to replace what I have when car was purchased- an unmatched set of eagle gt and OE contis in stock sizes. Would like to hear opinions on other brands of both OE size tires and
f 245 40 18
r 275 35 18

Right now I'm considering the summitomo, Hankook V12 and dunlop direzza.

Thanks

inTgr8r · 05-21-2010, 06:01 PM

In for this too

mousitch · 05-21-2010, 06:05 PM

I'm loving the v12's in f 245 40 18 r 275 35 18. Sticky but maybe a hair less responsive than the Conti's. Look good too!

inTgr8r · 05-21-2010, 06:35 PM

^Responsiveness seems to be the most common "wish was better" comment about V12s
Have you played with the pressures at all to see if responsiveness improves?

The 245/275 combo is at the limits of the OE wheels.
How do they look?

inTgr8r · 05-21-2010, 06:41 PM

One problem with the Direzza Star Specs is a limited OE size selection for the rears.
The only choice is to go up to the 275s, which are a little on the porky side at 32lbs.

inTgr8r · 05-21-2010, 06:46 PM

In OE sizes, another extreme perf, choice is ADVAN Neova AD08

Tested against Direzza & Bridgestone RE-11
http://www.tirerack.com/tires/tests/...y.jsp?ttid=118

RBull · 05-21-2010, 07:17 PM

Quote:

Originally Posted by mousitch

I'm loving the v12's in f 245 40 18 r 275 35 18. Sticky but maybe a hair less responsive than the Conti's. Look good too!

did you experience the oe tires and how does your set up compare- handling, ride, tramlining etc? any issues with uneven wear, ride etc. I see you're also dropped on the H&R's which is the set up I'm moving to.

fitchesbass · 05-22-2010, 01:48 PM

Quote:

Originally Posted by inTgr8r

One problem with the Direzza Star Specs is a limited OE size selection for the rears.
The only choice is to go up to the 275s, which are a little on the porky side at 32lbs.

They offer a 265/35/18 for the rear so you don't have to go to 275s....

inTgr8r · 05-22-2010, 02:52 PM

Quote:

Originally Posted by fitchesbass

They offer a 265/35/18 for the rear so you don't have to go to 275s....

Yes but the diameter of the 265 is quite a bit smaller than OE.
OE 255/40 is 26
the 265/35 is 25.3

http://ejelta.com/tiresize/index.htm...=18&maxdelta=2

RBull · 05-22-2010, 03:13 PM

^+1.
That's not something I want to do.

jragan · 05-23-2010, 12:21 PM

Everyone who runs the Direzzas LOVES them. I use them for track tires as well and they're fantastic.

RBull · 05-23-2010, 03:51 PM

^thanks. what size are you running and are there are down sides?

jragan · 05-23-2010, 04:50 PM

Quote:

Originally Posted by RBull

^thanks. what size are you running and are there are down sides?

http://images53.fotki.com/v440/filen...tockWheels.png green columns.

Down sides? More rubber on front has the slightest negative effect on turn-in-ability (but it never hampered me any). There are far more positives than negative.

RBull · 05-23-2010, 06:28 PM

Quote:

Originally Posted by jragan

http://images53.fotki.com/v440/filen...tockWheels.png green columns.

Down sides? More rubber on front has the slightest negative effect on turn-in-ability (but it never hampered me any). There are far more positives than negative.

thank you.

Skelekitty · 05-23-2010, 07:50 PM

Quote:

Originally Posted by jragan

Everyone who runs the Direzzas LOVES them. I use them for track tires as well and they're fantastic.

Yep. We DO love them!

Long discussion here: http://www.zpost.com/forums/showthre...=367909&page=2

and here: http://www.zpost.com/forums/showthread.php?t=368118

inTgr8r · 05-23-2010, 09:24 PM

Good links^

I will be giving strong consideration to the 235/265 combination.
I like the effective gearing change & as long as fronts and rears are changed the same amount, it should keep the DSC happy.
& in the Star Specs, the 265s are 4lbs. lighter than the 275. (28 vs 32)

Quote:

Originally Posted by Finnegan

Edited 4/2/10 @1.20pm after my discussion with Tire Rack--just sharing what they told me--I don't claim it's "correct".

If you do, we're going to hate it as too!

I think you'll be fine!

This is exactly what we decided to go with: 235/40/18 in the front and 265/35/18 in the Star Specs. (50 buck rebate on those from Tire Rack as well.)

The overall diameter both front and rear is going to be about 1/2" less than stock, which we went into this knowing and which may have the following effects:

A slight increase in effective gearing (which should be fun ) Tire Rack confirmed this
Probably a very slight drop in highway MPG (oh my, the EPA mileage police may come after us ) Tire Rack confirmed this
Possibly a slight bit more stiffness in the sidewall (which may offset 10mm wider rubber on the stock wheels). Tire Rack confirmed this but recommended running 2 PSI higher as there's less rubber/air cushion [shoulder wear potential with stock PSI] and to increase hydroplanning resistance
Potentially more resistance to hydroplanning than the 245/275 setup (from what I've learned, going to wider rubber increases the chances of this, and given the amount of rain we get we took a more conservative position....)
Tire Rack confirmed that this is an issue with wider rubber--with moderate increases it can be offset with a slight PSI increase
Tire Rack also confirmed the suggestion by many here to dial in some negative camber on the fronts to both help with wear with this setup, decrease understeer, and improve turn-in.

I know I could have gone the 245/275 route, or 235/255 (couldn't get the front and rear diameters to be close enough), but this seemed to be the best solution for our needs and objectives.

Thanks for the great input! It made working through the options a lot easier. I'll give an update after they're mounted and broken in.

Thanks Jeremy!

Skelekitty · 05-23-2010, 09:49 PM

Before joining this board I knew that tires were round black things made of rubber that made good road surfaces after they had run their useful life on a car. I'm going to have to give up my girlie card if this automotive edumacation keeps up.

p.s. Installing my new Ultimate Pedals with upper left heel-toe extension next weekend - I think I'll go put on some makeup and curl my hair.

inTgr8r · 05-23-2010, 09:52 PM

^ you'll love the pedals, had them on my 06 M roady,
I can't wait to get a set on this car.

Tip on installing;
Wedge a block behind the clutch & brake pedals so that they are solid when drilling.

Skelekitty · 05-24-2010, 01:48 AM

Quote:

Originally Posted by inTgr8r

^ you'll love the pedals, had them on my 06 M roady,
I can't wait to get a set on this car.

Tip on installing;
Wedge a block behind the clutch & brake pedals so that they are solid when drilling.

That's smart. I'll remember that!

05-21-2010, 05:41 PM	#1
RBull Captain 12 Rep 725 Posts Drives: 2007 M Coupe Join Date: Apr 2010 Location: Nova Scotia iTrader: (0)	Z4M tire opinions I'm looking to replace what I have when car was purchased- an unmatched set of eagle gt and OE contis in stock sizes. Would like to hear opinions on other brands of both OE size tires and f 245 40 18 r 275 35 18 Right now I'm considering the summitomo, Hankook V12 and dunlop direzza. Thanks Last edited by RBull; 05-21-2010 at 07:19 PM.. Reason: typo
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05-21-2010, 06:01 PM	#2
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	In for this too __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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05-21-2010, 06:05 PM	#3
mousitch Dark Sider 129 Rep 1,779 Posts Drives: 2008 Space Gray Z4MC Join Date: Jan 2010 Location: Missouri iTrader: (11) Garage List 2008 Z4M Coupe [7.50]	I'm loving the v12's in f 245 40 18 r 275 35 18. Sticky but maybe a hair less responsive than the Conti's. Look good too! __________________ [URL=http://imageshack.us/photo/my-images/153/071jt.jpg/] 2008 Space Grey M Coupe-Euro headers-RPI Scoop-Gruppe M CAI-Eisenmann Race Cans-RE X-pipe-ECU Remap with O2 and EGT delete-H&R Sport springs-Zeck CDV delete-Stock Gloss black powder coated wheels-LED Tekarbon Angel Eyes Project-Michelin Super Sports-Hardwired Uniden R7-H&R front and rear spacers-Alarm module added-stereo amp recoded to vert spec settings
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05-21-2010, 06:35 PM	#4
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	^Responsiveness seems to be the most common "wish was better" comment about V12s Have you played with the pressures at all to see if responsiveness improves? The 245/275 combo is at the limits of the OE wheels. How do they look? __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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05-21-2010, 06:41 PM	#5
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	One problem with the Direzza Star Specs is a limited OE size selection for the rears. The only choice is to go up to the 275s, which are a little on the porky side at 32lbs. __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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05-21-2010, 06:46 PM	#6
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	In OE sizes, another extreme perf, choice is ADVAN Neova AD08 Tested against Direzza & Bridgestone RE-11 http://www.tirerack.com/tires/tests/...y.jsp?ttid=118 __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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05-22-2010, 03:13 PM	#10
RBull Captain 12 Rep 725 Posts Drives: 2007 M Coupe Join Date: Apr 2010 Location: Nova Scotia iTrader: (0)	^+1. That's not something I want to do.
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05-23-2010, 12:21 PM	#11
jragan Imola Lover 26 Rep 749 Posts Drives: 2007 Imola Red M Coupe Join Date: Jul 2008 Location: Fort Worth, Texas iTrader: (0)	Everyone who runs the Direzzas LOVES them. I use them for track tires as well and they're fantastic. __________________ His: RIP-"Ruby" *E86 ///M Coupe: Pics Track Pics Short Vids Long Vids Hers: 997-1 C4S*: Pics
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05-23-2010, 03:51 PM	#12
RBull Captain 12 Rep 725 Posts Drives: 2007 M Coupe Join Date: Apr 2010 Location: Nova Scotia iTrader: (0)	^thanks. what size are you running and are there are down sides?
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05-23-2010, 09:49 PM	#17
Skelekitty Second Lieutenant 42 Rep 250 Posts Drives: '07 Imola Red Z4 MCoupe Join Date: Feb 2010 Location: El Dorado township, CA iTrader: (1) Garage List 2007 M Coupe [10.00]	Before joining this board I knew that tires were round black things made of rubber that made good road surfaces after they had run their useful life on a car. I'm going to have to give up my girlie card if this automotive edumacation keeps up. p.s. Installing my new Ultimate Pedals with upper left heel-toe extension next weekend - I think I'll go put on some makeup and curl my hair. __________________ ~Krissi~ '07 Imola Red Z4 MCoupe Eisenmann Sport Exhaust \| RE X-Pipe \| RE Transmission Mounts
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05-23-2010, 09:52 PM	#18
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	^ you'll love the pedals, had them on my 06 M roady, I can't wait to get a set on this car. Tip on installing; Wedge a block behind the clutch & brake pedals so that they are solid when drilling. __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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