thoughts about track rims and tyres

[daniel_csl]

That will be an issue, sorry.

Not good. I thought some people got away with 265/35/19 or even 255/40/18 which are pretty much the same diameter.

[alexk]

Do you think I stand a chance if I put 19x8.5 ET20 in the front ?

[shimmy]

Do you think I stand a chance if I put 19x8.5 ET20 in the front ?

so same as standard except 25mm less offset and therefore pushed 25mm further out to the wheel arch. Based on the fact that with 15mm+ spacers the tyre seems to foul the arches my guess is on standard geo you will not be able to do this on road.:bigcry:

You may just squeeze the on with 3 deg neg camber for track work!!:thumbs:

[TANKSLAPPER]

I run BBS ch's 19 x 8.5 x et35 with a 12mm spacer on the front which is = to et23 with no problems at all.

The tyre & the wheel was inside of the front arch so 3mm more wouldn't make any difference.

The only down side is pushing the inside of the wheel a further out by 25mm over standard makes the car dart around particularly over bumps as it put more leverage on the steering and it tramp lines more.

[shimmy]

I run BBS ch's 19 x 8.5 x et35 with a 12mm spacer on the front which is = to et23 with no problems at all.

The tyre & the wheel was inside of the front arch so 3mm more wouldn't make any difference.

The only down side is pushing the inside of the wheel a further out by 25mm over standard makes the car dart around particularly over bumps as it put more leverage on the steering and it tramp lines more.

what camber though TS?

[TANKSLAPPER]

what camber though TS?

I normally run 2.25 for the road and 3 degrees on track.

I did find with the increased off set on the 8.5j and running 3 degrees camber fooked the inner edge of the front tyres. I put this down too more movement on the wishbones / bushes due to the increased leverage.

My advice is to keep the wheel close to the strut as possible, but increased the width, this should put less stress on the wheel bearing as well.

The tyre wear was was mainly under hard braking where the deflection is greater.

[shimmy]

I run BBS ch's 19 x 8.5 x et35 with a 12mm spacer on the front which is = to et23 with no problems at all.

.

really surprised by this. cant see how it doesn't foul the liner or arch

[TANKSLAPPER]

really surprised by this. cant see how it doesn't foul the liner or arch

All the above is with cup tyres

I did find differences between wheels. ie OEM BBS CSL wheel ie 19 x 9.5 et27 had a clearance between the wheel and the strut of 7mm, but BBS CH'S 19 X 9.5 et 28 only had 3mm between the wheel and the strut.

[shimmy]

almost sounds like the et for the BBS CH is wrong!!

[shimmy]

Managed today to sort out my car and remove my track wheels, check them all over and put back on road pads and wheels for the winter.

From my recent outing at Bedford trying out rear CSL rims up front i can report the following;


1. Running 9.5Jx19 rims with 265/30 Cups up front with -3 camber on track suspension setting clears the arch

2. I did notice (see pics) minorubbing of the arch liner but that when checked was from slow speed max lock turns in the pit area.

3. No excessive wear of the tyres

4. The car did feel like it was gripping better on turn in and the data logger seemed to back that up although it does need some more runs in constant good weather to back this up

5. I did notice however the slightly heavier or maybe grippier front wheel as soon as i got in!!

The pics below show the minor rubbing and the before and after look of the car.

[TANKSLAPPER]

I got the same as that on full lock, but I don't call it rubbing. I only call rubber to metal rubbing. lol

Just put the heat gun on the liner and stretch it or take out the liner, sorted. !

[Forelli]

Very interesting thread, thanks for all the insightfull information.

Am I right to assume that CSL and M3 geometry is exactly same? If so, then something I have gathered from other M3 forums is that square 18*9,5 et 35 with 265/35 and 10mm spacer back is an ideal setup for spirited driving (track/street), also allows for swapping around wheels.

I myself am driving with some widelip supadupa heavy blings, but am going for light & wide (&cheap)wheels for next season (the 19" blings are now my winter wheels...)

I have put my eyes on tirerack Motorsport MT1 wheels, which I like stylewise, but problem is I havent found them for sale anywhere in europe. (doable with streetable camber -2 to-2,5) Can take up to 275/285 tires and no spacers needed.

Specs 18*9,5 et 35 19lbs 319$ and/or 18*10 et25 20lbs 329$

http://www.tirerack.com/wheels/WheelCloseUpServlet?target=runWheelSearch&initialPartNumber=MT188544520MG&wheelMake=TRMotorsport&wheelModel=MT1&wheelFinish=Matte+Grey&showRear=yes&selectedRear=MT189535520MG&autoMake=BMW&autoModel=M3+Coupe&autoYear=2002&autoModClar=&filterSize=18&filterFinish=All&filterSpecial=false&filterBrand=All&filterNew=All&sort=Brand

Then I know people are running Enkei NT03 wheels square (needs if I recal correctly atleast -3 camber) Can be found in Europe

Specs 18*10 et 25 20,5lbs 279£

http://www.performancealloys.com/details.asp?procedure=wheel&id_wheels='NT03%20M%20F1%20Silver'&id_wheels_manufacturers='Enkei'&id_wheels_sizes='18x10'&price='279'&permission=564347317

Then there is ofcourse the D-force LTW5 wheel for which looks I am not too fond of, but can also be found in europe.

Specs 18*9,5 et35 18,5lbs

Does anyone have anyexperiences with any of these wheels? Does anyone know if anyone sells MT1 in europe?

[DuncanR]

thought about slicks last year Hazy but my car is road spec and no cage and once you see the extra cornering G forces caused when using slicks and then translate that into the extra speed you are likely to hit a wall then i decided then and there;

2. No Slicks without cage


to go along with my previous rule;


1. No Ring laps without cage

:thumbs:

might be worth it at Bedford but really dodgy at Brands, Oulton or Silverstone

Mmmmmm you do have a serious side mate ...but I like your thinking, and wise words.:thumbs:

[shimmy]

Does anyone have anyexperiences with any of these wheels? Does anyone know if anyone sells MT1 in europe?

no, not personally

im sure youll find MT1 in Europe and if not the US suppliers willship for you for sure. They were very keen to ship me my rims even though they came from Japan!:thumbs:

[shimmy]

Mmmmmm you do have a serious side mate ...

just creeps out there sometimes (at work i am a bastard!)