thoughts about track rims and tyres

[_Nathan_]

Shame because the BMW BBS WTCC 17 inch wheels come up regularly and are cheap :D

[shimmy]

UPDATE

at Simpsons yesterday i got the geo redone and test fitted and ran some CSL rear rims on the front.

We had to get the geo out to -3 camber at the front to get he tyre under the arch. It just touches the wheel arch liner on full lock but seems to miss everywhere else, especially on track damper settings.

Need to test it at the next dry trackday before deciding if its worth getting 4x 19x9.5 (or18x9.5). At the moment with the et27 the rim is 5mm further off the shock then OEm front rim so i can go 5mm back in therefore my estimate of a new front with et32 is about right

With an et32 you should be able to run at -3 camber on track and even maybe -2 camber on road witht he same 4 rims all round.

[TANKSLAPPER]

I've just changed my wheels and tyres over

On the rear I run currently BBS ch's 19 x 10j et20 with 265 cups

On the front I just bought BBS ch's 19 x 9.5 et40 with a 12mm spacer which is = to an et28 with 265 cups

I must say, it look the dog bollocks. The tyre is about 2mm outside the front wheel arch with a 2.5 dergrees of camber. I only have 2-3mm between the strut and the tyre.

A very tight fit, if it rubs on track I will increase the spacer size. I reckon this is the best fit for 19" s it's a petty BBS don't do them in 18" in 9.5j

I will put some photo's up over the next day or so.

[Bealo]

Great R&D guys

I'm watching this with great interest.

[shimmy]

Originally Posted by TANKSLAPPER

I must say, it look the dog bollocks. The tyre is about 2mm outside the front wheel arch with a 2.5 dergrees of camber. I only have 2-3mm between the strut and the tyre.

A very tight fit, if it rubs on track I will increase the spacer size. I reckon this is the best fit for 19" s it's a petty BBS don't do them in 18" in 9.5j

I will put some photo's up over the next day or so.

sounds real close to me. be careful and if you see any black smoke STOP

what is the gap like between the strut and tyre at the front? OEM runs about 5mm away. My guess is you need more clearance to the arch so see if you can reduce the spacer as you dont wanna run any more camber on road really, as -2.5 will shag the tyres pretty quick anyway

i might come by your place next month and see how it looks if thats ok, maybe after a visit to Racoon and Brands

[TANKSLAPPER]

Originally Posted by shimmy

i might come by your place next month and see how it looks if thats ok, maybe after a visit to Racoon and Brands

Shimmy, You are always welcome at my place, just pm me first.

[TANKSLAPPER]

Here's a photo ofthe BBS ch's 19 x 10j et20




Here's a photo of BBS ch's 19 x 9.5j et28





you can see the difference, both have 265 cups on. The second picture is just road legal AND A mot pass. As the other, well, your nicked LOL

[shimmy]

Originally Posted by TANKSLAPPER

Here's a photo of BBS ch's 19 x 9.5j et28

the 9.5J look spot on, i think you missed a trick not getting 9.5J all round making tyre wear and wheel swap dead easy (although you loose that 0.5 inch of rear grip)

[Bealo]

So am i correct in saying that the ideal size is 19 x 9.5 et28 all round with 265/30/19 cup tyres???

Look forward to hearing your comments of the extra grip at the front on trackdays.

[shimmy]

Originally Posted by Bealo

So am i correct in saying that the ideal size is 19 x 9.5 et28 all round with 265/30/19 cup tyres???

Look forward to hearing your comments of the extra grip at the front on trackdays.

NO not in my opinion

IF you want one size all round on my car (intrax and camber -2 and -3) i would say that ideal size is 19x9.5J et32 with the 265 cups.

This would put the rubber back to the same point 5mm away from the damper (same as OEM front rim) and give you maximum clearance on the arch. It may mean that it is enough for you to run them on the road and adjust the camber to -2

The et28 is very clsoe to OEM rears et27 and is very close to the arch, a little rubbing on max lock and be very wary on the ring and road with big compressions. Also not sure how soft or OEM suspension would cope as it wil travel further.

Quite a few variables though so def worth borrowing some rims and seeing how they work before you buy

Bedofrd Monday should be my trial with the rear CSL rims all round. (you coming BEalo?)