thoughts about track rims and tyres

[shimmy]

so although i am a collector of Michelin Cups i have been wondering what to do this winter to adjust and improve tyre and rim choice for next years trackdays to optimize cost, grip and flexibility

my DECISIONS so far;

1. Stick to Michelin Cup tyres, not R888 or slicks for various reasons
2. same size rims all round, not sure on size though

Choices still to make

3. What diameter size rim (18 or 19 inch)
4. Rim offsets and spacers needed
5. What width rims (9, 9.5 or 10 inch)
6. Michelin Cup tyre sizes 235, 245 or 265

So i need you guys to have a think and tell me what to do.

Interestingly from the http://www.michelinman.com/tires/ult...specifications website you can find out the tyre circumference diameter and width for each tyre on each rim size.

For instance 235/35/19 standard front Cups on 8.5 inch CSL rims have section width of 9.49 inches

Or standard 265/35/19 standard rear Cups on 9.5 inch CSL rims have a section width of 10.70 inches

So if i was to put rear rims and tyres on the front i would have to cope with an extra 1.21 inches of tyre width

BUT for instance of i was to run 265/35/18 on 18 inch rims the wodth would go up to 10.9 inches i guess from the extra height of side wall

any thought you old pipe smoking nerds

[Hazy]

why not spare wheels with slicks Shim?? Massive massive difference IMO, worth the hassle of a spare set of wheels. Popular opinion says the E46 chassis works better on 18's too, dunno why?

[shimmy]

Originally Posted by Hazy

why not spare wheels with slicks Shim?? Massive massive difference IMO, worth the hassle of a spare set of wheels. Popular opinion says the E46 chassis works better on 18's too, dunno why?

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



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

[Hazy]

Originally Posted by shimmy

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



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

yeah, see what you mean





































faggot

[shimmy]

Originally Posted by Hazy

faggot

a careful queer

[Thorney]

18" Pro Race 1.2 rims, 18 x 9. Dunlop Direza tyres.

Wheels are cheap and bullet proof, tyres last longer than R888's

Done

[shimmy]

Originally Posted by Thorney

18" Pro Race 1.2 rims, 18 x 9. Dunlop Direza tyres.

Wheels are cheap and bullet proof, tyres last longer than R888's

Done

yep John., Curly/Nords had these and seem like the best option £ for £.

The rims will save about and avarage of 2.5kg per corner over CSL rims but not sure how that translates to feel etc

But i was just trying to work out if the same could be done with 265 Cups but a/m rims.

I wonder if they do 19 inch Pro Race?

[Nords]

Funnily enough I have decided to run with 19" cups only so Hazy is after my 18" with the dunlops on (they are a great tyre and road legal!)

[shimmy]

Nords

part of my plan is to find a reduced weight wheel like the pro race 1.2 and i am not convinced by the effectivelness of the dunlop tyres (but could be convinced)

So i will def need lighter 19 or 18 inch rims (cheap ones) and then fit either 19 or 18 inch 265/35 tyres (you can get both in Cups.)

[glendog74]

Originally Posted by shimmy

my previous rule;


1. No Ring laps without cage