15x12 6UL for new 295+ Hoosier A7
 

Hoosier has leaked info about a new super wide 22.7" tall tire based on their current 275/35R15 with a plug (strip of tread) inserted into the mold. Exact width and tire size TBA from Hoosier. Anticipated release date is early May 2017.
295/35/15 is a working size designation but I understand that's not final. Best guess on the actual width (not what will be printed on the sidewall) will be 305~325. As of today at least, even Hoosier doesn't have the final sizing info, just the green light to go into production. Contact Hoosier at 574-784-3152 for more info

To accommodate this new tire, we are producing a 15x12 +12 6UL variant that should be here by mid June. Just Tungsten for this variant.

15x12 on a Miata. Jeebus.

Fendered IRL car?

@Downmented you need these.

So it took two decades to get there but finally there is a reason for the bulbous widebody kits that businesses developed for the V8 swap cars so long ago (and always completely under utilized the new-found space they created and/or had to use massive spacers)

Already subbed to the thread about the tires lol.

This is wild. Very awesome.

Awesome!

I wonder what this will do for wheel hub failure rates?

Nothing. Hubs should be timed out anyway. Hub failures are a result of extreme usage by owners not aware of the most current info. The Miataverse has to start thinking of these little cars we beat on like airplanes or proper race cars. OEM parts don't always last forever or have acceptable failure modes under duress.

For the guys that don't do their homework, running on old beat up ball joints, hubs, never checking subframes or controls arms for cracks, yeah they are going to be snapping important bits off the car at inopportune moments.

So, is there any chance in heck that this could legally fit in the front of a CSP car? 275s on 11s already rub everywhere...

Neal

I am glad to see rims and tire being developed together. The 296-305 would never realize it's true potential without a 12" 6UL wheel.

I look forward to seeing the body kits that will soon follow to fit these meats.

Steering rack limiters my friend, and proper bump stop length.

Jeebus

https://cimg8.ibsrv.net/gimg/www.mia...ebe616be01.jpg

Hnnnnnng. Looking forward to a bunch of people getting rid of their 10's and 11's so I can scoop up second hand for my NA fender fail

I spent a few minutes scavenging around the shop. Some of these are used race wheels, some are samples for upcoming wheels, so please excuse the mismatching of finishes.

15x6/7/7.5/8/9/10/11/12"

Awesome.


https://cimg8.ibsrv.net/gimg/www.mia...a78524170f.jpg

All your 15" Miata wheels are belong to us

Will the 15x12 fit under stock NA fender without rubbing?

Yes, absolutely. You have my word on it. Guaranteed. Flawless OEM Style fitment.

That is only what, exactly two times the width of the OEM wheel? Like a glove.

Just needz a roll and mad camberz yo.

Seriously, these are insane, in to see pics mounted on a miata.

IIRC, 1.6s came with 14x5.5s, so it's more than 2x. :)

--Ian

MX-Dually with super singles, like a boss.

The future of the miata is brighter than ever.

Emilio, we're all indebted to you.

https://cimg0.ibsrv.net/gimg/www.mia...30a792227c.jpg

Still waiting to hear any hard evidence on SP-legal fitment. And availability. ;-)

The 12's width to diameter ratio looks absolutely ridiculous.

Update from Hoosier. No ETA on tires but definitely not in time for Solo Nats. Tread is 11.5" and it will designated a 295/35.
275 is 10.1" tread for reference. We'll get one to mount as soon as it becomes available.

thank you very much for this information.
forwarding to Tire Rack

I Should have some of this new sized purple crack shipped next week they say.

Must be a beta tester. My contact at Hoosier said they didn't have a production date as of last Tuesday.

I talked to somebody that the contingency person forwarded me to on Monday can't remember the name. Said he had several samples and they looked good after some fiddling with the casing design layup some they now look good. called again today to verify they got all my contingency requests and they said looks like they will have them ready for shipping next week. Already shipped the 275's I requested. Going to be interesting getting these to work on the front. In theory just enough modification to get them to fit will be legal for SSM you but you will have to take a 200 lb weight limit hit though. Don't think CSP can stretch the rules that far for front inner finder massage work needed. For now I think we will put them just on the back of a CSP car and see what the result is. If you don't care about rules then have at it but I still think non DOT 23.5X12R16 is where to go for XP and beyond.

Only if you run them staggered.

So the market will be flooded with 15x10s soon? Or did the 15x10 guys already upgrade to 15x11 last year?

What I'm waiting for is 275 width RS-4s.

Idk, the 295 will still be faster then the 275 on a 10 or 10.5, though wider is better if you have the pocketbook/rules allowance to fit them.

I'm not sure the 295 is worth making he car wider than most other things in the class and adding 200 lbs.

So i wrote hoosier an email yesterday about the tires.
My question:
"Hi,
I'm would like to know the status of the 295/35-15 Hoosier A7. I know its in development and was wondering when it will be available to purchase.
Thanks,"

this is what I got back:
"Thanks for writing and good question. This Tire Size / Project is on hold at the moment. Management is discussion the future of this tire size.

I am unsure of its future at the moment.

Feel free to write back next month for an update."

Doesn't give me a great feeling but whatever I guess. I plan to run these on a CSP car.

Update I got today. They are not happy with the just add a spacer to the existing mold approach. Apparently the profile ends up dipping in the middle too much or something. They are apparently going to spring for a new tool to get the profile right at a much greater expense. ETA is moved out. I would assume 6 weeks for tooling then prototype testing and measurement probably a few more weeks I think.

So juuust in time to miss nationals.

I don't think anybody would have any time for fitting and testing before nats anyway. hopefully get them for off season setup and testing.

15x12 6UL wouldn't be here in time either. Doubt many could get custom wheels in time and get the car dialed back in before Solo Nats even if the tires were here.

IIRC, SCCA doesn't allow tires at nationals unless they were regularly available for most of the year anyway.

--Ian

New update they may be canceling the new size. forced me to take 275's for contingencies.

So, if they end up cancelling, what is that going to do for 949 planning to produce the new 15x12's?

Step one is to convince the folks at Hoosier that there is sufficient Market to pay for the tools needed. If that doesn't work then we simply don't make the 12s.

I call them once a week for the last two months

So, hypothetically when this tire gets produced, what does one need to do to alignment numbers to actually benefit from a tire that wide? I'd imagine running much closer to 0* camber and virtually no castor either? (standing on a lot of shoulders here, from my lowly 205/50 on a 15x7 status)

It's been standard practice on CSP Miatae running the 275 Hoosier to stand the tire up a bit. But don't take my word for it. Test. Get your own data. This matters. I'm assuming you own a probe type pyrometer.

Just got this from hoosier:

"Thanks for your follow up e-mail. Good news – we had a slight delay and possible cancellation of the project in August, but the green light is back on and I am hoping for a Fall / Winter 2017 release date.

Feel free to write me back in October for an update. I am hoping to have some news in the next couple of weeks.

Thanks for your patience awaiting this new tire size."

Does this mean 15x12 is back on?

I'd like to see these 15x12s:makeout:

15x12's were put back into the production queue the day after we got confirmation the tire was a go. No price specs or ETA on the wheel yet.

Sweet, looking forward to purchasing a set.

15x12 6UL is available for preorder.
Arriving ~Dec 15th.
4x100, 14.9lbs, +12 offset.
One finish available, Tungsten.

https://cimg8.ibsrv.net/gimg/www.mia...f2e6c902ae.jpg

:giggle::drool::likecat:

We have been test fitting our new 15x12 on the T1 car, right now we have a used set of 275/35s on them just to be able to move the car around and see approximately how tight everything will be. Looks like event with the 295/35 we should be pretty good, might have to do a little more trimming, we shall see.

https://cimg7.ibsrv.net/gimg/www.mia...581d895ac1.jpgInner clearance RR on NA chassis with NB knuckles.
https://cimg6.ibsrv.net/gimg/www.mia...c71c5cbf94.jpgOuter clearance with Mazda Comp Widebody
https://cimg4.ibsrv.net/gimg/www.mia...2dc89126a2.jpgRear View

We purposely set the offset as high as possible to allow for tubbed chassis. Those who need a little bit more room can throw a small spacer in. For the type of car these are going on trimming offset with the spacer shouldn't be a problem. One can always space the wheel out but you can't space it in if it offered starts too low.
​​​​​

Looks right at home under those fenders. I love this car.

Honestly we expected to be doing more trimming, so far they are looking great.

Does anybody know the actual width of hoosiers 295 tire? Trying to size some tire warmers.

NA rear uprights are 5mm narrower. That will reduce inboard clearance. Track cars base more of their lap time on steady state lateral grip so they'll tend to run more rear negative camber. Add power and you'll need to reduce camber, stand the tire up a bit more. Autocross cars base more of their lap time on being able to accelerate of a turn so they stand the tire up even more.

So a relatively low power NB track car might run -2.7° + the 5mm spindle. A high power NA autocrosser might want -1° and have 5mm narrower spindles. The difference could be nearly 20mm at the top of the tire. So one is no where near clearing, the other just clears.

295/35-15 is real!

Hoosier Tire | News | Hoosier Releases Wider A7 Tire for 15" Wheels

They do have a good bit more usable tread width and you can make them "fit" on the front of a NA at 4" ride height with a 12lb sledge hammer. https://cimg5.ibsrv.net/gimg/www.mia...f6759ca027.jpg
https://cimg6.ibsrv.net/gimg/www.mia...c9525e5f35.jpg
https://cimg7.ibsrv.net/gimg/www.mia...f83f4aa511.jpg

I really can't thank Jeff and the rest of his team enough for making this tire a reality. We have been working on this project for over 2 years and when the boxes showed up at my house I was in total shock. There were so many times we were so close and something would happen that would set things pack or threaten to totally cancel the project. Jeff continued to work with us and it is now a reality!!!! The one area that my car always had a significant disadvantage in was over all tire contact patch. I think the playing field will now be level.

Thanks for spearheading this project Eric. The Miataverse owes you a debt a gratitude. 6 on the way to our shop. :party: