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      03-26-2011, 08:33 PM   #1
Jet Mech
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Track day tires

I am 2nd on my dealers list and put 1500 deposit on a White M coupe last week. Im already looking on Tire Rack for track tires and wheels. Has anyone else thought about this yet? I was thinking of looking into 18inch wheels and tires to save money and have more of a selection. Any input appreciated.
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      03-26-2011, 08:39 PM   #2
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Originally Posted by Jet Mech View Post
I am 2nd on my dealers list and put 1500 deposit on a White M coupe last week. Im already looking on Tire Rack for track tires and wheels. Has anyone else thought about this yet? I was thinking of looking into 18inch wheels and tires to save money and have more of a selection. Any input appreciated.
This is easy. Check for E92 m3 fitment. You should probably check for threads on e90 post.
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      03-27-2011, 01:25 PM   #3
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remember, dropping down to 18's is going to cause you to have to go with something like a 275 or 285/35/18 in front to maintain the proportions of the tire and keep the odometer and speedometer in check. or, you could go with a taller sidewall. In the rear, you would need 305/35/18s. Not sure how much cheaper or more common these are than 19" wheels, but something to keep in mind when making the switch. The fenders look wide but I'm not sure how much clearance they would have for wheels that wide, especially depending on the offset.

Now, as far as brands go, Wedsport TC105N are some of the best track wheels out there. For the price (under $2K) they are super light (17.5# at 18x9.5).

On the cheaper end, Enkei NT03's and RPF-1's are pretty cheap, around $300 a wheel in that size, and weigh around 18-20 lbs. I have the NT03s on my Evo and they are great, strong wheels that look pretty good.

I would start on street tires and learn the limits of the car before you go to a full slick or R-compound like A6 or R6s since they are less forgiving and expensive, and a waste if you don't use them to their full potential.

Something like a Bridgestone RE011R, Dunlop Z1, Advan AD08, Michelin PS2, Hankook RS-3, etc...
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      03-27-2011, 01:31 PM   #4
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Quote:
Originally Posted by l888apex View Post
remember, dropping down to 18's is going to cause you to have to go with something like a 275 or 285/35/18 in front to maintain the proportions of the tire and keep the odometer and speedometer in check. or, you could go with a taller sidewall. In the rear, you would need 305/35/18s. Not sure how much cheaper or more common these are than 19" wheels, but something to keep in mind when making the switch. The fenders look wide but I'm not sure how much clearance they would have for wheels that wide, especially depending on the offset.
Seems to me it would be easier to just go with a taller sidewall. For the rear, you could run 265/40/18 instead of 265/35/19 and be just 0.164% bigger diameter than the original tire. No width clearance issue to be concerned about.
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      03-27-2011, 01:48 PM   #5
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245/40 and 265/40 is going to be a little bit of a weird size for availability of some tires, and for track duty, more width > sidewall, but yea I also mentioned going that route just didn't give him the numbers for it.
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      03-27-2011, 02:28 PM   #6
Jet Mech
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Thanks for the suggestions. I do about 5 drivers schools a year with my other cars (01 M coupe and E36 M3/4) and always get a different set of wheels and dedicated track tires as i dont like to trash the stock wheels and street tires. My first DS back in 98 i trashed the stock tires so since then i like to have a dedicated set. This will be my first car with 19inch wheels and when looking on Tire Racks site there was not much choice in wheels and tires for track. The only tire for the track was the Michilen Pilot Cups at 418.00 for the fronts and 466.00 for the rears. Also wheels are heavy in 19s. Im thinking that 245/40/18 and 265/40/18 but Tire Rack has no track tires in that size. Hopefully once the car comes out there will be more options or it might just be cheaper to trash street tires at every drivers school.
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      03-27-2011, 04:41 PM   #7
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I have bought a 18" OEM set of wheel I'll take a set of toyo R888 or falken rsr 1/2 slick
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      03-28-2011, 11:35 PM   #8
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If the 1M does indeed have similar/the same suspension as the M3, you can go up to 265-275 front, 285-295 rear. You would obviously need wider rims to fully utilize the wider contact patch. As for overall diameter don't worry about it too much. BMW's DSC is designed to be pretty tolerable. (I have 265/35/18 and 295/30/18 which is way off of stock)

As for tires for street extreme performance you can get Yokohama AD08, Bridgestone RE-11, etc. For DOT-R, Michelin Cups, Nitto NT01.
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      03-29-2011, 08:43 AM   #9
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I'm planning to run a square set-up with 18 X 10 ARC-8 wheels fitted with 275/35-18 rubber.

Neil
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      03-29-2011, 09:21 AM   #10
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Quote:
Originally Posted by MDORPHN View Post
I'm planning to run a square set-up with 18 X 10 ARC-8 wheels fitted with 275/35-18 rubber.

Neil
what would the offset be for a square setup?
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      03-29-2011, 09:24 AM   #11
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what would the offset be for a square setup?
et 25

Neil
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      03-29-2011, 09:42 AM   #12
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Turner Motorsports recommends and sells a similar square setup for E92 M3's using 18 x 10 wheels and 275/35-18 tires. They offer both the Forgeline and Rays wheels. Not sure of the offset though.
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      03-29-2011, 10:38 AM   #13
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Lots of great ideas, thanks guys.
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      03-30-2011, 02:01 PM   #14
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Saw this on the BRracing site the other day. It's actually discussing tires for a 135i street driven time attack car, but I figured the brand characteristics may be of interest.
------------
TRACK tires -

You want the best grip, last a long time, and have a VERY progressive break-away (this is key for most drivers), then go with - TOYO R888

You want track tires, but you have to stay above a tread wear rating of 180 for rules reasons (like the GTGP rules), then go with - Yokohoma AD08 or Dunlop Direzza Sport Z1

You want the plain best track tire, without moving to full slicks – and realize they won’t last as long as Toyo’s – then go with - Hoosier R8
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      04-24-2011, 06:56 PM   #15
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Quote:
Originally Posted by l888apex View Post
remember, dropping down to 18's is going to cause you to have to go with something like a 275 or 285/35/18 in front to maintain the proportions of the tire and keep the odometer and speedometer in check.
Not a specialist on tire sizes here, but how does choosing a wider 18" tire (275/35 instead of 265/35) has anything to do with the speedometer, which is propably based on wheel RPM ?
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      04-24-2011, 07:00 PM   #16
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Quote:
Originally Posted by MDORPHN View Post
I'm planning to run a square set-up with 18 X 10 ARC-8 wheels fitted with 275/35-18 rubber.

Neil
Why does BMW sell 1M with different sizes front and rear, and/or why would you run a square setup then?

Just asking to learn...
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      04-24-2011, 07:20 PM   #17
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Originally Posted by hwelvaar View Post
Not a specialist on tire sizes here, but how does choosing a wider 18" tire (275/35 instead of 265/35) has anything to do with the speedometer, which is propably based on wheel RPM ?
http://www.miata.net/garage/tirecalc.html
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      04-25-2011, 04:16 AM   #18
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Quote:
Originally Posted by l888apex View Post
remember, dropping down to 18's is going to cause you to have to go with something like a 275 or 285/35/18 in front to maintain the proportions of the tire and keep the odometer and speedometer in check.
Most Speedo's are ~5% fast (show higher that reality). Here in the UK the regulations require that they read between 10% to 0% of the true reading. Going from 265/35/19 to 265/35/18 is less than a 4% change. Chances are, it'll make your Speedo nearer spot on and reduce the rate the Odometer clocks up.

In any case, this is only relevant if you drive them long distances on the road, for dedicated track day tires it doesn't matter. If anything, narrower treads (on the same rim) will stretch the tire more, making the sidewall stiffer and reducing the rolling effect of the tread on the rim giving potentially better handling.
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      04-25-2011, 04:41 AM   #19
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Quote:
Originally Posted by l888apex View Post
Thanks, I played around with that tire size calculator:


Tire Size Comparison
Specification Sidewall Radius Diameter Circumference Revs/km Difference
265/35-19 93mm 334mm 668mm 2099mm 476 0.0% (stock size)
265/35-18 93mm 321mm 643mm 2019mm 495 -3.8%
285/35-18 100mm 328mm 657mm 2063mm 485 -1.7%
295/35-18 103mm 332mm 664mm 2085mm 480 -0.7%
265/40-18 106mm 335mm 669mm 2102mm 476 0.2%
235/40-18 94mm 323mm 645mm 2027mm 493 -3.4%

So indeed you would need 295/35-18 or 265/40-18 to not influence speedometer.
However, the last size (235/40-18) is BMW's recommended winter tire size.
It has -3.4% size compared to stock tires, which is not that diffefent from the 265/35-18 size (-3.8%).

And by checking some online tire shops, I get the impression that 265/35-18 is a more common size than 265/40-18. For example Toyo R888 seems only available in the size 265/35-18.

Last edited by hwelvaar; 04-25-2011 at 04:50 AM.
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      04-25-2011, 04:45 AM   #20
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Most Speedo's are ~5% fast (show higher than reality).
Can someone with a 1M delivered, and with portable sat nav with speed indication, please compare the dashoard speed reading with the GPS speed reading, and report ?

Thanks !
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      04-25-2011, 05:33 AM   #21
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I have been wondering the same thing re track tyres and wheels. Had a look on M3 Post since their wheels should match up perfectly with ours.

The 18" and squared setup seemed to be the the way to go, but I was just thinking that given the 1Ms hike in torque compared to the M3 it will probably be more likely to oversteer, so maintaining the contact patches sizes is probably quite important for balance. Had a look at a couple of the suggested setups but shipping to Australia is always ridiculous. The APEX Arc-8 really caught my eye as they are pretty light and quite cheap. Also being flow formed should be quite strong relative to their weight.
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      04-25-2011, 06:41 AM   #22
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Quote:
Originally Posted by hwelvaar View Post
Can someone with a 1M delivered, and with portable sat nav with speed indication, please compare the dashoard speed reading with the GPS speed reading, and report ?

Thanks !
If you compare almost any cars' Speedo with a GPS then you'll see the same thing. There was a similar discussion on the 155mph speed limiter here...

http://www.1addicts.com/forums/showt...511414&page=13
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