Need some help on tire choices guys. I am setting up my car for BSP class, mostly for fun. I like driving my car hard and playing with modifications so I'm not worried about being competitive in A-Stock just want to have fun and spend some money...

Setup this first year is going to be mostly stock. Koni yellows on all 4 corners, with stock springs set on the lower perch = 1/2" lower than stock. Saner bar. I'll start with a typical autocross alignment, so camber should be around -1.5 in front and -2 in back. I will use an extreme summer performance tire at first before considering going to an A6 or V710.

I want to run a staggered setup and found some new light weight wheels I want to use:

Front: 17 x 7 +49, weight 14.7 lbs
Rear: 17 x 8.5 +59, weight 15.6 lbs

Now, from reading as much as I could, seems like 245/275 front/rear has been a popular staggered setup in A-Stock. It seems the 245 in front has seen some minor rubbing but with this setup, I should have 6mm more clearance in the front since the offset isn't as high? Also, I should have the same extra clearance in the rear?

Will this rubber work w/ these wheels and the 1/2" drop from Koni? Or what would you recommend instead of these?
245/45/17
275/40/17

If I want to go lower than the Koni / Stock Spring drop, what size tires would I need to be safe? Say I wanted to drop 1.5" from stock, what size rubber would you put on these wheels? Minor modifications acceptable but I don't want to roll my fenders...

Thanks guys!

 

[QUOTE=TraviS2000,Mar 30 2009, 06:47 AM]I want to run a staggered setup and found some new light weight wheels I want to use:

Front:

 

if you are setting the car up for BSP, why would you want to use AS wheel/tire sizes? many of us AS guys run 275 all around or 275/295. seriously, if i were building a BSP or XP (which i wil lin the future) i would be running a 17x10 & 17x11 with 315/335 setup...

 

Aren't most guys running 285/295 30/18 A6's?

 

not a lot of BSP s2k's out there, less actually prepped. mainly because the evo's will destroy them with the open boost rules.

 

The 295 is a little bit tall... good for higher speed courses though, and i've thought about getting another pair of wheels and having them mounted with the 295's in case i could use the extra speed....

But so far for me, the 285 seems great, but running a tire that big or bigger pretty much makes it mandatory to have a co-driver along for the ride with you if you want any sort of temperature in them for your runs...

But stepping up to sizes like Rodney mentioned is probably where this mess is heading, even for myself... thats why i went with such a wide wheel, so that i could slip on the wider tire without pinching it... right now i'm slightly stretched with the 285's.


<~~ running 18x11 with 285/30-18 on all 4 corners.

 

I would buy the biggest wheel width possible that I could get to work. I'm afraid you will have to do some fender rolling with stock springs in order to get the bigger tires on.

I would consider buying 4 of those rear sizes and get them to work with some 275/275 or 275/295. I wouldn't cut any corners, so Im also going to recommend some stiffer springs. That will be much cheaper than the sway bar you will have to buy to keep the tires off the fender.

The Koni Yellows have pretty soft compression and even with the rebound all the way up, you will have rubbing issues. You also don't have to use the bottom perch to lower the car. The Konis allow you car to settle more than the OEM shocks.

You will have 6mm less clearance with the fender with a 49mm offset.

 

The 295/18 A6 actually sits better (beads) than the 285/18 A6 on smaller wheels. Many of the Solstice guys have proven this setup. My rear 275/17s get consistent temps across the tread with the 8.5" width OEM sized wheel. The fronts are piched about 1/2" on both sides on the 7" oem sized wheel. I still see consistent temps across the tread at 32-34psi depending on outside temps.