225/45/15 & 245/40/15 Maxxis RC-1
 

Maxxis has added the 225/45/15! We have been talking with them for a while and tested 245/40's last summer, but now the sizes are public. Right now I have no idea when or how much but will certainly share when I know more.

The 205/50/15 is the spec tire for SuperMiata. When the 225/45's drop, they'll be adopted in the series.

Sizes | Maxxis Victra RC-1

edit:
This is a hand grooved 245/40/15 RC1 proto from 2013 on a 15x10. We tested them (un-grooved) on 10's last summer and they were fast. That data doesn't mean anything now because the final production tire will be a bit different, possibly even wider. I have been working behind the scenes to get this tire made for about 6 years now. It's almost here. Wow.

https://www.miataturbo.net/attachmen...ine=1393975871

Awesome. Definitely in to see if these have more street grip than the Rivals (the NT-01's weren't grippier on the road than the RS-2's, in my experience).

The RC-1 is a race tire with only two longitudinal tread grooves. You would have to pay a race tire specialist shop to hand cut grooves to suit your needs. The tire I pictured is my personal set hand grooved by an off road racing shop. Cold race tires do not make for good traction on a commutermobile on a cold day.

https://www.miataturbo.net/attachmen...ine=1394044545

We can do that!


Also PTS will be an East Coast distributor for the Maxxis RC-1 very soon.........:)

Oh, I know about the two groove. John still says 245 street tire is still 'under consideration' if anyone is wondering.

Can't wait for the 225/45 RC1.

+1
Instant SuperMiata spec tire on 9s. Im thinking .75~1s on most tracks over the 205/8.

I'm not interested til 245. be nice to have a lower cost alternative to Hoosier.

Great news on the 225's! I just hope it does not bump the 245's production slot.

I look forward to running the 245's on 10's this year.

Props to all that made this tire happen!

I want 245 so bad I could cry!!

I want that 15x10 setup pictured above. With grooves so the police don't stop me.

So, the 225/45s should be ready with the next batch of 6ULs then?

Can we pre-order the combo yet?

:D

Is there a rundown of how these compare to the 225/45 Toyo RR's?

From what I'm reading above, they don't exist yet in 225/45. I think the main draw is comparable performance for less $$. Some have probably done a comparison in 205/50 by now.

Yes please. That way I dont have to sacrifice my daily's gen 1 8s to the track gods or try and cram 205s on 9s.

Per the tire hierarchy thread elsewhere on this board, the 40tw Toyo RR is 1-2s faster than a 100tw Maxxis RC-1 on a 2 minute course.

Here's the tire discussion: https://www.miataturbo.net/race-prep...hy-chat-76811/

Any news when the 225 and 245 will be available?

I was told by John at Maxxis to expect the 245 late 2nd quarter. I assume that means about June give or take. Not sure about the 225.

I ran both tires (205 RR and 205 RC-1), both on 9" wheels at Chuckwalla, and I'd put the difference at just north of 1 second.

As much as I worked for the 245, I'm actually hoping we get the 225/45 first. It would be perfect for SuperMiata as our cars now sit with 140whp/2300#. The 245 would be fun at streets and maybe BW in hot weather but probably a bit too much tire for other tracks with our current power. That and we pretty much all have a set of 9's but the 245 really wants 10's and needs some hardy fender work to fit NA's.

We shall see..

The selfish side of me wants to see the 245's first but the business man in me acknowledges the 225 should come first. It would be great if they both hit at the same time. That would really bring brand awareness to the entire Miata crowd.

I hope they arrive sooner than late Q2. Having them early in the season would really help people switching over.

I'm personally looking forward to 225s, since my current build is roughly (closely?) following Emilio's 95R/SuperMiata formula.

Why do I feel like you're setting the stage for disappointment on the expected 245 delivery date?

I don't have any info one way or the other.

It's now June and I have just been informed that some dimensions have been approved for Road use in EU as well.
https://www.miataturbo.net/attachmen...1&d=1401720087
notice the little "E4"
The local distributor mentioned the 245/40-15 as "on the way" but with no ETA. He has seen no sign of the 225 yet.

Late Q2 sound like September to me, as I'm used to everything being at least one quarter late.

Maxxis RC1 Competition

^It's a swedish tire place that lists the 245/40 as in stock. Did you see this NiklasFalk? I wonder if it's just an error...

^ Now that's some dedicated snooping - scouring websites in foreign languages haha!

My fenders have been ready for a 10" wheel for two years.. but Hoosier budget wasn't in the cards. The 245 RC-1 makes things possible for me.. Cannot wait. Now I'm just wondering which will become available first - the 245 RC-1 or the 15x10 gen4 6UL?

First world problems.

-Ryan

Yes I've talked to Ralph, 245 was "on the way" and 225 is a bit further behind when i asked earlier in the summer.

If this is real or estimates based on information from Maxxis is another matter.
I'm not in the market for tires until next season and I have to get someone to make a real local test of Kumho vs Maxxis.
I'm not sure that a TW100 RC-1 must be faster than a TW50 V70A on the same dimension (which is the fastest currently), but the 225/45-15 will be the only competitive tire in that dimension. So I hope that I can test RC-1 on the 15x9" next year.
If things work out well I'll have to figure out if fender mods and 15x10" is worth it for testing 245.

A direct availability question sent.

Ralph have three 245/40-15 in stock.
I have no idea what shipping tires to US would cost :D

Any word on the 225s? Probably not until next Spring?

Have you read the Andy Hollis review in GRM?
I've heard similar descriptions, a mismatched compound/carcas mix, making it difficult to get and keep heat without overheating.

But there can of course be dimension/car/weight combinations where they behave less strange (a 944 localy run 255 wide as rear rubber and they claim that they work). And being a cheaper play rubber in 245/40-15 for those who don't want to use the Hoosiers every time is always a plus.

I have not found a review of them on Miatas, and Andy used his CRX, but he mentioned "Setup info came from Emilio Cervantes ... the West Cost's SuperMiata series, where the Victra is a spec tire". Hmm, in the 205's then, how bad compared to 225 NT01?

I would much rather get the Hankook TD (Z221) in Miata sizes, which seems to last longer than anticipated for the ones using it for TA here (while being almost as fast as soft slick rubber).

Testing a few weeks ago at Buttonwillow. 15x10's :)

https://fbcdn-sphotos-f-a.akamaihd.n...8558299_o.jpg?

On maxxis website, it shows 225 being available. Is this old news and I just missed it?

http://shop.maxxis.com/c/automotive_victra-rc-1

Anyone running a production set yet?

Thanks

Whoa, those must have just been released.
Last time I looked a few weeks ago they still weren't available for ordering!

Damn! We need the 245!

Yea, last time I checked the 225 wasn't available on the drop down menu. I wonder when the 245 will show up

Anyone can tell me where they're made ?

Bought a set of the 225s today. Will be interesting to compare to the R6s I ran all this year.

Counting the days for the 245...

How many days are in your count?

Too many :cry:

FYI, they're made in Taiwan...

I love the idea of these tires as a good Hoosier alternative, I found out about Maxxis through a friend that races his GTO and a host of BMWs (e30 and e36). Then I saw a bunch of guys on the bike trails with Maxxis tires as well.

I wish they made these pre-grooved for street use, but as I was discussing in my other thread, I don't know if road use will get them to operating temps and they might just be dangerous for my needs.

The RC-1's are perfectly happy on the street. Hand grooving makes them very noisy but that is more than offset by filling pulled or 25mm fenders with rubber and not needing ricer offsets. 245's on 10's under a 300whp Miata is just pure goodness.

And do the 10" wheels fit under NB fenders with a pull, or are flares needed? I don't see the 10" listed on the site either

I just got an email from John Wu saying the tires are on the water but that the Long Beach workers are throwing another fit so well be at their mercy when the container is available, should be soon though.

245/40/15 RC-1 Miata fitment
 

NB on 15x10: Flat roll front and rear, very slight pull rear
NA on 15x10: Mini flares or heavy pull front and rear.

Few know this but our 15x10 +25 offset was optimized for this exact tire, three years before it was available, not the 275/35/15 Hoosier as most folks would guess.

As a review since previous information varied, are those the only mods needed? I've wanted to go 15X10 for the meatiness but I thought there were other suspension or control arm mods needed.

Asking about NB's specifically. Looks sick on that red one, and I'm sure grip is amazing.

Got it. So now i just need to find a place that will hand groove these things.

No shop will groove a tire that has been run. They're concerned about gravel damaging the blades of the grooving tool. Has to be a sticker. Some will want them mounted, others not. Look for shops that do dirt track stuff. They all hand groove tires.

Cool thanks for the tips. :)

Plenty of good 'ol boys on Gasoline Alley.

Tires have Landed!!!!!!

***

245/40/15 RC-1's
 

We've been hiding these for a while now. Testing completed a few months ago, green light for production and boom, they're here. The final production version seen here is about 15mm wider than the P1 (prototype 1) shown in the OP. Squished but will work on 9's but really happiest on 10's.

Buy yours here Automotive, Victra RC-1-

https://scontent-a-sjc.xx.fbcdn.net/...11&oe=55099E21

Sonny behind the wheel, testing at Buttonwillow back in October

https://fbcdn-sphotos-f-a.akamaihd.n...8558299_o.jpg?

Awesome.
Emilio, thank you for all your work in helping to bring these to the market.

-Ryan

I look forward to getting some time on these tires. Thanks for making this happen Emilio!

What type or fender work will be needed to put the 245's on an NB with 15x9s? I just mounted up a set of 225's for this weekend but might go to 245's in the future. Again, thanks for making this happen.

Flat roll on NA & NB on 9 or 10. Heavy pull on NA.

For a track car, what's the approximate hp break where the extra inertia and rotating mass of the 10" wheel with wider tire makes sense? Compare 9" UL with 225 RC1 vs 10" UL and 245. Consider a track like Buttonwillow or Laguna seca on a 2000# car.