Originally Posted by turbofan
(Post 1223907)
Right. I mean, I know Emilio has some quick cars, but I don't believe there's a 500hp LS Miata in his stable right now to test which would be faster at that power level.
Do it! |
Originally Posted by OGRacing
(Post 1223891)
i'll ask the question. i got 500hp and it's blowing the tires off any time i get near the power band. i got 15x9. 225 or 245?
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https://www.miataturbo.net/attachmen...ine=1422327081
i found this today. This is how a race tire should look. this is a 245 on a 9". i'm not a fan of stretching race tires for road courses. i'll pick a 225 on a 8 every time. it feels like the sidewall is actually doing it's job. allowing for maximum traction. for auto cross i'll run a 225 on a 9". i like the turn in feel it gives. |
Hey that picture looks awfully familiar.. :)
These will be doing dual duty for road course as well as autox whenever the car gets back together. |
From everything I've read wider is better in both wheels and tires. 245 on a 9 is faster than 225 but 245 on a 10 is faster than 245 on a 9.
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How are the clearances with a 245 on a 9?
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Originally Posted by OGRacing
(Post 1226534)
i found this today. This is how a race tire should look. this is a 245 on a 9". i'm not a fan of stretching race tires for road courses. i'll pick a 225 on a 8 every time. it feels like the sidewall is actually doing it's job. allowing for maximum traction. for auto cross i'll run a 225 on a 9". i like the turn in feel it gives. There are a few narrower p1 (prototype 1) 245/40/15 RC-1's floating around with 2014 DOT codes and should not be confused with current production. Maxxis had a bunch left over after the first test and wanted to get rid of them. I bought all 50ish tires and sold them off to team members and selected Club Orange customers. By looking that pic, it's possible its a P1 tire. This is a production 245 on a 10. http://www.trackhq.com/forums/attach...015_rc1_1.jpg? |
I have reopened this thread, keep it clean and civil or we will hand out more bannings.
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Originally Posted by emilio700
(Post 1226574)
There are a few narrower p1 (prototype 1) 245/40/15 RC-1's floating around with 2014 DOT codes and should not be confused with current production. Maxxis had a bunch left over after the first test and wanted to get rid of them. I bought all 50ish tires and sold them off to team members and selected Club Orange customers. By looking that pic, it's possible its a P1 tire.
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Originally Posted by FrankB
(Post 1229156)
Emilio, we're there also 225's from 2014 that are smaller then the current 225's? Or were only the 245's effected by this?
There is just about zero chance you or anyone else on the planet has a prototype Maxxis anything without knowing it. |
For clarity, the above bronze 15x9 with 245 Maxxis was purchased directly from the OEM and as such should not be the prototype release.
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2 Attachment(s)
For folks wondering about clearance of the 245's on 9's... I was swapping my street wheels back on this morning and noticed that both of the front 245's were rubbing slightly on the inner fender right above the top hat. Those are 15x9 +36 wheels on an NB.
https://www.miataturbo.net/attachmen...ine=1431101632 Turbo Kitten is watching you. https://www.miataturbo.net/attachmen...ine=1431101632 |
I don't want to re-ignite a fire but my own testing support Emilio's findings.
I too was a non believer. Then I saw the light. 245's on 10's played a BIG role in the 1:41.6 at Sonoma last year! |
Originally Posted by ozbrock
(Post 1229819)
For folks wondering about clearance of the 245's on 9's... I was swapping my street wheels back on this morning and noticed that both of the front 245's were rubbing slightly on the inner fender right above the top hat. Those are 15x9 +36 wheels on an NB.
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Throwing gas on the fire...
After reading this thread I did some research on Tire Rack. Something I think some people have missed is that section width of a tire IS NOT equal to the tread width of the tire. Just looking at the specs on Tire rack, most 205/50/15 tires have a smaller tread width than section width. 205/50/15 Toyo RA1-8.4 inch section width/8 inch tread width 205/50/15 Potenza RE-71R-8.4 inch section width/7 inch tread width 205/50/15 Dunlop Z2-8.4 inch section width/7.5 inch tread width Point is that saying that a 205 50 15 on an 8 inch wheel is always best is only part of the story. |
Originally Posted by wannafbody
(Post 1231244)
Throwing gas on the fire...
After reading this thread I did some research on Tire Rack. Something I think some people have missed is that section width of a tire IS NOT equal to the tread width of the tire. Just looking at the specs on Tire rack, most 205/50/15 tires have a smaller tread width than section width. 205/50/15 Toyo RA1-8.4 inch section width/8 inch tread width 205/50/15 Potenza RE-71R-8.4 inch section width/7 inch tread width 205/50/15 Dunlop Z2-8.4 inch section width/7.5 inch tread width Point is that saying that a 205 50 15 on an 8 inch wheel is always best is only part of the story. The only 205's that might not be fastest on 8's (other than Hoosiers) are low performance street tires that are much narrower than 205mm tread. For those types of tires, no one cares about max g anyways. We're sort of assuming <240tw, DOT R compound or full slicks with a stated "205" tread. In which case theses 205's will be significantly wider than say, an 400AB Nankang Highway Grand Master Supreme XT, and thus, fastest on 8's. |
In addition, using those examples above, all 3 have an 8.4" section width. It seems to me that the section width is what will determine how it behaves on a particular wheel width more than the tread width.
I would wager that each of the tires listed would perform better on an 8 than on a 7" wheel. |
Originally Posted by turbofan
(Post 1231256)
In addition, using those examples above, all 3 have an 8.4" section width. It seems to me that the section width is what will determine how it behaves on a particular wheel width more than the tread width.
I would wager that each of the tires listed would perform better on an 8 than on a 7" wheel. |
Originally Posted by ozbrock
(Post 1229819)
For folks wondering about clearance of the 245's on 9's... I was swapping my street wheels back on this morning and noticed that both of the front 245's were rubbing slightly on the inner fender right above the top hat. Those are 15x9 +36 wheels on an NB.
https://www.miataturbo.net/attachmen...ine=1431101632 Turbo Kitten is watching you. https://www.miataturbo.net/attachmen...ine=1431101632 |
Originally Posted by tomiboy
(Post 1231294)
Are those 6ULs? Do you have brake ducts? If so will the 245s clear the ducting? What about sway bar clearance?
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