By the letter and spirit of the rule as written, the Rival-S is 2 pts. Available and unchanged treadwear rating. How NASA chooses to interpret the letter of their own rules in impound could change however.

Well, now we know where Greg put this tire. After a season of use since this thread was active, does anyone have any hard data on this tire? Now that use of an R7 is out the window for me for both TTE and TTD, I'm figuring out what I want to do. I don't really care about tire life. This thread is leaving me to believe that it's definitely faster than the Maxxis and RR. Is that true?

My car as is I can put a 205 Rival S on for 2016 and run TTE. The 225 bumps me out and I'd have to do significant setup changes. Thoughts on a 205 Rival S on 15x9s vs the 205 R7 on 15x9s?

What about a 225 Rival S vs 205 R7?

RE71R is same points, a tick faster and steers better. Some cars might work better on the V720. Haven't driven on those yet though.

Thanks for the reply. Are they as close to the R7 as you originally were speculating?

Bridgestone doesn't have NASA contingency, so that might still push me towards the Rival S.

205 ok on a x9?

New 225 Rival S on 15x9. I think 205's would go on, but they'd be real stretched looking. These are borderline in my opinion. My old 225 Nitto NT-01's were less stretched looking than these.


https://www.miataturbo.net/attachmen...ine=1449243009

https://www.miataturbo.net/attachmen...ine=1449243009

https://www.miataturbo.net/attachmen...ine=1449243009

Thanks for the pictures, those look like my 205 R7s on x9s. Looks like I'm in the market for 15x8s unless I can find a way to make 225s work with my points.

They look to have have pretty substantial tread splitting from the factory. Have they given you issues?

haven't run them yet. Hopefully will get to drive them on track late December pending weather.

I'll report findings in this thread...

I have lots of race miles on 225 Rival S, owing to running a trio of 7hr enduros earlier this year with a customer's Chumpcar team. We've never seen any issues with tread splicing. We run those tires on 8s because we can't fit 9s (stock springs), and they really do want 9s.

You can run non-Hoosier 205s on 9s, there's no downside to that aside from perhaps a small aero penalty. Hoosier 205s obviously want a 9" wheel.

How did they hold up in the enduro race? And how long did they last?

i think they look stupid (stretched 205's on 9" rims). :dealwithit:

Thank you. Yes, been running 205 hoosiers on 9s for a couple years now, happy to hear I can run 205 Rivals without buying more wheels. Appreciate it.

Why can't you run R7s?

2016 rules don't give me back 10 points any longer for being 40mm under base class tire width. Trying to re-configuring my car with minimal set up changes (not competing nationally), and the easiest way to still make class is down grading tires.

Ah, so you ran 195s before, gotcha.

No, I ran 205s in TTD. TTE field has been more consistent in my region though, and I'm pretty sure I can be at or towards the top of it with my car as is with Rival S tires and adding some weight. TTD is tougher without the purple stuff and/or more power.

What car do you have and what is it's base class or dyno-reclassed class? I'm fairly certain tire size limits is based off your car's base class, not which class you end up in after points.

It's a 96 VVT swapped, dyno reclassed to TTD* as the base class. This isn't my first rodeo.

Ah! That makes sense, sorry.

You can still use Hoosiers in D if you use stock aero with the same setup you would use in TTE with a TTE* base class. Basically you got knocked for 3 points, and you'll need to submit a new email for a new reclass since the base weight of all Miatas changed. Reclasses prior to the 2016 rules release are now void because of that. From what I can tell you'll get dinged for approximately 40 pounds if you keep the same maximum horsepower and base class.

+7 TTD* Base
+10 Hoosier R7
-7 Tire Size -30+mm
+5 Coilovers
+3 LSD

= +18

Or

+7 TTD* Base
+9 205 Hoosier SM7
-7 Tire Size -30+mm
+5 Coilovers
+3 LSD
+2 Sway Bars

= +19

I am confused with all the codes being thrown around here....

100 and 200 something or rather..nasa points etc....means nothing to me. I can barely keep up with the model codes... re71, Rival, rival S, R6, Hoosier this, Hoosier that, BFG (BF Goodrich?)...yahdy yahda.

My question is this...It seems to be a street legal tyre so is DOT rated (our class requirement) BUT is BFG Rival S faster than an NT01 or not?