SCCA Solo D Street discussion

[Desertnate]

The circumference of a 245/40/17 will be very close to the OEM size and also very similar to a 225/45/17.

Plugging in the various sizes here is very helpful. https://tiresize.com/calculator/

I'm interested in the clearance too. I think for my opening season in this car with 200TW tires I'm going with 225/45/17, but 245/40/17 is tempting for use in the future.

[cmiovino]

Originally Posted by foshjowler

Tire sizing question, does a 245/45-17 RE71RS fit without rubbing? I have 7mm spacers coming for stock offset wheels, but not positive I won't still have issues. My thought is I want the mph from the taller tire over a 245/40. The other option is 235/45 as I think the mph will offset any width disadvantage on many courses.

We have people stuffing 245 (and possibly 255) Falkens and I think RE71RS under there. I believe the 7mm spacer up front is the ticket, but I believe you'll still need some aftermarket wheels for a few more millimeters. If you're keeping with stock wheels, that's your main issue.

245/40/17 is most common - double check on the wheel offset needed, even with the spacer.

[cmiovino]

Since this thread is alive again, I'm sticking to DS again this year. Have some 225/45/17 Yoks on the way I snagged for a hell of a deal at the year at about $700 total. Still waiting on them. Didn't pull the trigger on STX-lite as the coilovers I was eyeing up fell through.

Very interested to see how the Yoks work with the upgraded swaybar I did. I have a great year in 2021 on them compared to the 660's in 2022.

[kraftyone]

I have decided to pull the trigger and switch to STX this season. I am waiting on my Shaftworks coilovers to show up as we speak. Found I good set of 949 racing 6ul in 17x9 and grabbed a set of 245 40 yoks. Already installed front and rear bars.

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[Desertnate]

Originally Posted by cmiovino

Very interested to see how the Yoks work with the upgraded swaybar I did. I have a great year in 2021 on them compared to the 660's in 2022.

I understand the Yokohama is probably a better tire, but was it that noticeable of a difference from the 660? What didn't you like about the 660's.

I'm about a week or so from pulling the trigger on a set of dedicated wheel/tires and will be going with the 660's. I don't think I'm willing to spend the extra on the A052's but would like to hear why you weren't very happy with them.

[DocWalt]

The RT660s cycle out before the tread is gone. You'd be much better suited with the RE71RS, they are faster than the A052s when on a camber limited car. Both the RE71RS and A052 are fast all the way through the tread too, so the per run cost is cheaper.

[hinge]

I ran RT660s on my BRZ for a few months last year and they were not confidence - inspiring, they only seemed to work between 70-80* ambient and were extremely difficult to put power down with, and they were borderline lethal in the wet, and I ran BFGs with my FRS in the past, so that's saying a lot.

Running Bridgestones this year and expect a major improvement.

[kraftyone]

Originally Posted by Desertnate

I understand the Yokohama is probably a better tire, but was it that noticeable of a difference from the 660? What didn't you like about the 660's.



I'm about a week or so from pulling the trigger on a set of dedicated wheel/tires and will be going with the 660's. I don't think I'm willing to spend the extra on the A052's but would like to hear why you weren't very happy with them.

I just picked up 245 40 17 A052's from discount tire direct for $185 ea. I applied for there credit card and saved plus got 6 months same as cash.

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[foshjowler]

Originally Posted by hinge

I ran RT660s on my BRZ for a few months last year and they were not confidence - inspiring, they only seemed to work between 70-80* ambient and were extremely difficult to put power down with, and they were borderline lethal in the wet, and I ran BFGs with my FRS in the past, so that's saying a lot.

Running Bridgestones this year and expect a major improvement.

I put my 660s back on this week as the first event of the year is Sunday, and I can concur. The first thing I noticed was how much I liked my AS4 better. I'm sure once they get some heat in them they offer more grip, but in every other way an all season is better than year old RT660s. These are definitely only good as local burners. Haven't run them in the wet since last year, but never noticed anything bad, definitely not BFG Rival S (rivaling?)



Getting the RE71RS for bigger events this year, and hoping they provide something better.

[foshjowler]

Thinking I'm going to start accumulating STR trim goodies throughout the year to jump up next year, or whatever street touring they're going to. Did a little thinking over the off season and I've come to the conclusion that I'd rather make the BRZ the track car in a couple of years, and sell the Miata. Then get an car for daily driving duties. STR bolt ons are probably all I'd be doing to the BRZ anyways for track duty, so might as well take the plunge.

[Desertnate]

Originally Posted by DocWalt

The RT660s cycle out before the tread is gone. You'd be much better suited with the RE71RS, they are faster than the A052s when on a camber limited car. Both the RE71RS and A052 are fast all the way through the tread too, so the per run cost is cheaper.

Originally Posted by hinge

I ran RT660s on my BRZ for a few months last year and they were not confidence - inspiring, they only seemed to work between 70-80* ambient and were extremely difficult to put power down with, and they were borderline lethal in the wet, and I ran BFGs with my FRS in the past, so that's saying a lot.

Running Bridgestones this year and expect a major improvement.

Thanks for the inputs. Is there no middle-ground tire option? This package will be autocross only, I don't see any opportunities this year to get in any track days.

Cold and wet are a consideration. We had 2x rain events last year (a third one was cancelled/rescheduled due to lightening) and at least 2x events that were run in 30~40F weather. This year's season has been condensed to try and avoid the cold, but with our unpredictable weather, you still can't rule anything out.

The Nexen's and Kumho's are close in price, but each seem to have their faults too. RS4's are close in price too, but seem better suited for endurance track duty. I ran a set of RS4's for a couple events with my BMW (they came with the used wheels I bought) and they wore like iron. I was a touch faster than the PS4S I'd run previously, but I didn't get enough time with them to tell whether I was really gaining much with them.

I'm not to the point where I'm hunting any trophies, so I'm not trying to find the absolute competitive edge.

[foshjowler]

Originally Posted by Desertnate

Thanks for the inputs. Is there no middle-ground tire option? This package will be autocross only, I don't see any opportunities this year to get in any track days.

Cold and wet are a consideration. We had 2x rain events last year (a third one was cancelled/rescheduled due to lightening) and at least 2x events that were run in 30~40F weather. This year's season has been condensed to try and avoid the cold, but with our unpredictable weather, you still can't rule anything out.

The Nexen's and Kumho's are close in price, but each seem to have their faults too. RS4's are close in price too, but seem better suited for endurance track duty. I ran a set of RS4's for a couple events with my BMW (they came with the used wheels I bought) and they wore like iron. I was a touch faster than the PS4S I'd run previously, but I didn't get enough time with them to tell whether I was really gaining much with them.

I'm not to the point where I'm hunting any trophies, so I'm not trying to find the absolute competitive edge.

I would probably consider the the RT660 to be the middle ground tire. It has its shortcomings, but they can certainly be competitive at locals. I've gotten fastest PAX on them, and many other top 5s across multiple clubs.

[strat61caster]

+1 Falkens are the current middle ground between yoke/stone and non autox tires, maybe Kumho v730 or Nankang CRS, and I wouldn’t write off the BFG Rival S1.5 (but wet and cold are not it’s strong points), I’ve seen some Falkens begin to peel and you can certainly overwork them, I heard some people got a dud batch but it’s not like Kumho has a stellar history either.

https://grassrootsmotorsports.com/ar...-buyers-guide/

[cmiovino]

Originally Posted by Desertnate

I understand the Yokohama is probably a better tire, but was it that noticeable of a difference from the 660? What didn't you like about the 660's.

I'm about a week or so from pulling the trigger on a set of dedicated wheel/tires and will be going with the 660's. I don't think I'm willing to spend the extra on the A052's but would like to hear why you weren't very happy with them.

• Heat cycled out at about 125 runs. Ran them out to 200 runs. There's still tread left and they're not even at the wear bars, but they started losing pace halfway through the season. This really bugs me about tires because I do ~25 events per season (200 runs) and don't toss out tires when they have half tread left.
• Overall they were probably 5-10% down on overall lateral grip, particularly in the front, as compared to the Yoks. Might want to chalk that up to not running enough pressure however.
• Rears didn't hook up on launch like the A052's did, even with are torqueless wonders.
• They weren't confidence inspiring. I have videos of me going balls out, early on throttle, holding WOT through elements. Falkens I felt like I couldn't do that at all.
• The Yoks were more audibly communicative - which I really like in a tire.

It's not that they were absolutely trash terrible, but they were a letdown in just about every category somewhat.

On Yoks I was up in the upper 1/4 in our competitive region a lot. With the Falkens I struggled to make it to 1/2 and left nearly every event pissed off

Seems like a lot of guys locally are ditching the 660's for the RE-71RS. I just haven't had time with them. They do better on camber limited cars, but the Yoks are likely right up there with them. $688 for the Yoks on sale and with the price messed up on Discount Tire vs $1,000+ for RE's... I'll take Yoks again.

Very well might do RE's next year if I stick to DS.