Is section width the most important metric to go by here or is it important to consider the tread width as well if you don't want things to stretch too much?

Just for reference, the regular direzza (dz102), the S-drive, and the Direzza zII star specs all have a 8.4 section width. The respective tread widths are 7.1, 7.4, and 7.5. If someone is doing this for price reasons (like myself), it would make a lot more sense to go with the slightly more expensive S-drives if the measurements are accurate, no?

 

I'm sure wider treadwidth is also better there for what we're shooting for. That being said, what measurements are accurate? When 200TW stuff seems to dwarf normal 300TW street tires, I kind of wonder if there's any accuracy there for what they list. I had 195/50 S.drives on 15x6 NB wheels and 195/50 RSR's on 15x7's. I think they sat about the same on their respective wheel so I kind of doubt the S.drive runs all that wide.

 

You ignore all the tread and section width data and go with test results. We're lucky enough to have some very smart and we'll funded members who have run every combo under the sun so to maximize performance you run 195 on 7", 205 on 8", 225 on 9" and 245 on 10", anything else will be a compromise.

 

Some of us can live with that tho...

That's what I'm trying to figure out. If price is an issue, I'd rather go with the one with the best measurement if performance/metrics of importance are about the same. These are for a street car so I'm not worried about what the well funded members are doing... just looking to do what's right for me without running a stupid amount of stretch.

I've also seen 225's on 10's which should be super sketchy, but were totally fine.​

 

Finally got around to getting my tires and wheels to the shop to be mounted. I have been to two different places and neither can mount these things (15x9 Advanti Storm and 205 Federal 595RS-RR) They are telling me they do not have adequate air pressure to pop this on the bead. They say the sidewall is too stiff to get on.

Has anyone else had this issue? Any idea of a solution? Anyone in the Milwaukee area that knows of a shop that does this regularly?

How the hell do those stance bros get their crap on?

 

I am LOL'ing IRL at your screen name.

<---- Loudest purple NB

 

The Subie bros use Big Bear in Oconomowoc and I heard Endless Autosport in West Allis will as well.

 

Good to know, I have an appointment set up at Lake Country Alignment in Oconomowoc for next week. Those guys and Big Bear I have heard good things about and apparently have equipment to handle this set up. Sadly this is an hour drive each way just to mount tires..... Thanks for the tip.

 

Ether and a match I've heard works. YMMV

 

Defiantly more exciting than more air pressure

 

How about more cowbell?


OP, please post pictures of the tire/wheel combo when you have everything mounted. Thank you!

 

I will post pics once I have the tires on and again fitment on the car when its finished. Just got the roll bar in last night and cutting plastic trim tonight

 

Haha, I was so fed up with the damn thing when I finished installing my roll bar that the carpet and insulation over the rear deck area looks pretty blah. I recommend trying to be a bit more exacting with the cutting so you don't have a ton of space around the arms of the roll bar.

 

I completely messed up my carpet cut on one side. I have it tight around the bar legs but hacked up another area..... you're right. by the time I got to the carpet I just wanted to be done. Absolute PITA experience.

 

To get my 205s on 9s, I had to have someone who prefers payment in beer over cash. Luckily I already knew 'a guy'.

 

So you're saying that you bought yourself a 6 pack and went to town?

 

Not at all. Some illegal building a 1000hp m3.

 

Just a note to those who might not know - tire manufacturers are given a window that they have to be within for the tires to be certified (TR&A, ETRTO) and it depends on the rim. For example a 225/45R15 on a 7.5" rim can be between 216m and 232mm wide and from 577mm to 589mm in diameter. On a 8.5in rim the width window is 226mm to 242mm. So what you're really looking for is the rolling tread width if you want to know the physical size of the tire.

 

Got the Federal 595RS-RR tires mounted on the Advanti Storm S1 in 15x9. Two local tire shops were not able to set the bead as the standard air pressure couldn't get the stiffer side walls to set. I had to take it to a guy who had a... I think it was called a Cheetah bead blaster. That set them right on. Pics on fitment:

 

HPDE UPDATE:

I do not have a lot of on track experience, I autocross every summer, and did a track day 2 years ago in a 1990 miata. Just had these on the Milwaukee Mile course for 3 20 minute sessions in 60 degree weather. These things grip..... General road noise is a bit higher, most reviews say it sounds like there is a small plane following you, this is pretty accurate, but on the track they were fantastic. Slight squealing when you're getting to the limit, sharp turn in response, Grip immediately out of the paddock and I never felt them lose any grip through the 20 minute sessions. I paid $360 shipped for this set earlier this year, absolutely great for the price. I am hoping to get in as many driving events as possible, so I will have to see how they do long term.