What does everyone think of gentleman's agreement to run 7.5 tires for the Sprints race?
June Sprints update
#21
Posted 06-05-2020 07:22 AM
#22
Posted 06-05-2020 09:25 AM
What does everyone think of gentleman's agreement to run 7.5 tires for the Sprints race?
You mean just like the POG agreement from 10 years ago? I recall several frontrunners that chose the dark side then.
#23
Posted 06-05-2020 09:44 AM
You mean just like the POG agreement from 10 years ago? I recall several frontrunners that chose the dark side then.
Well if I can get all of you to agree, then i run the faster
- Tom Sager likes this
East Street Auto Parts
Jim@Eaststreet.com
800 700 9080
#24
Posted 06-05-2020 12:16 PM
What does everyone think of gentleman's agreement to run 7.5 tires for the Sprints race?
Is there any real evidence that the 7's are faster? I ran the 7.5's for the first time a couple of weeks ago, 4 total sessions for a weekend. Could not say that I felt the 7.5 was any slower or faster.
#25
Posted 06-05-2020 12:20 PM
Is there any real evidence that the 7's are faster? I ran the 7.5's for the first time a couple of weeks ago, 4 total sessions for a weekend. Could not say that I felt the 7.5 was any slower or faster.
Not that I am aware.. Just thinking narrower and lighter at Road America should be faster? Data from the few who tried elsewhere suggests the 7.5 is faster. I have not back to backed them, trying to avoid a costly and senseless test
Jim
- trimless likes this
East Street Auto Parts
Jim@Eaststreet.com
800 700 9080
#26
Posted 06-05-2020 06:05 PM
Is there any real evidence that the 7's are faster? I ran the 7.5's for the first time a couple of weeks ago, 4 total sessions for a weekend. Could not say that I felt the 7.5 was any slower or faster.
I was told that its the same compound and construction except the rib design. Is that not the case? I have not weighed them.
Frank
TnT Racing
SCCA Ohio Valley Region
#27
Posted 06-05-2020 07:43 PM
Jim you need to buy 8 sets of stickers thanks to the smac!
This is one reason I will be buying a replacement race rather then spending money on tires to race.
Smac dropped the ball so why do you think some other front runners who opposed tire marking would want to agree with you now????
K. Webb
Powered by East Street Racing (Best engines in Spec Miata)
Driver coach, Spec Miata Prep shop, Spec Miata Setup
2016 Hard Charger award passing 12 cars runoffs 2016 Mid Ohio
2016 P3 RUNOFFS OVER 40 DIVISION LOL!
2015 First consolation prize Northern Conference Majors Title Pageant
2015 Winner Circus Cat Majors Road America
2015 Winner BlackHawk Majors crash fest
My Signature is still not as long as Danny boy's
#28
Posted 06-05-2020 08:31 PM
7.5 tread area is slightly wider but the tire overall (aero-wise) is not wider. If you put each tire flat on a floor next to each other they are essentially level at the tallest part of the sidewall.
#29
Posted 06-05-2020 11:14 PM
7.5 tread area is slightly wider but the tire overall (aero-wise) is not wider. If you put each tire flat on a floor next to each other they are essentially level at the tallest part of the sidewall.
Not sure that is clear. Are you saying contact patch is wider but overall width from the widest horizontal measurement point is the same?
*edited: for clarity
________________
Shaffer
SM #31 - Texas
#30
Posted 06-06-2020 06:49 AM
This is way too complicated.
--because someone commented that we should all post our names, and not be anonymous. I agree.
#31
Posted 06-06-2020 10:36 AM
- RWP80000 likes this
#32
Posted 06-06-2020 06:18 PM
Not sure that is clear. Are you saying contact patch is wider but overall width from the widest horizontal measurement point is the same?
*edited: for clarity
Yes.
#33
Posted 06-06-2020 06:21 PM
I was told that its the same com of both tires appears to be the same.
Durometer reading of both tires looks to be the same.
#34
Posted 06-07-2020 11:26 AM
Annual tech: 2019 annual tech validity has been extended. Any annual conducted on or after March 12th will be valid.
This is not mentioned in the updated Supps...but I found this in Fastrack...
"For 2020 only, current annual technical inspections will be extended 3 months past their original expiration date (valid for a total of 15 months). All expiration extensions will end on 12/31/2020. For example, an original expiration date of June 15, 2020 will have an extended expiration of September 15, 2020. All inspections with an original expiration date between September – December 2020, will have an extended expiration date of 12/31/2020."
FYI.
- Tom Sager likes this
--because someone commented that we should all post our names, and not be anonymous. I agree.
#35
Posted 06-07-2020 09:30 PM
- DrDomm likes this
Marc Cefalo
www.planet-miata.com
570-262-1013 direct
#1 source for new and used Miata parts and accessories.
#36
Posted 06-07-2020 09:57 PM
comparison back to back:
https://www.facebook...03166699823972/
Thanks. I’m not sure the more squared off shoulder is an “improvement“ that we want. In some tires from the past that design contributed to a falloff in performance and even a perceived change in optimal setup between a new and used tire. It depends on multiple factors, with both tire and car, but I don’t think it’s a given that it’s better.
#37
Posted 06-08-2020 09:26 AM
Spent the weekend(June 5,6,7) at Laguna Seca as SCCA was allowed to run their event. Despite the mask police(you got 2 warnings and then were kicked out)and every competitor was only allowed 1 guest or crew...it was good to get back out!!
I'm hoping this isnt the norm but I saw several sets of SM7.5 with tread separation??? One set had a couple tires with "chunks" missing...2" in diameter and almost to the cord. These tires had 5 cycles. The other set I saw on the discard pile at the tire mounter...2 tire were very "de-laminated". 10" sections of the tire it looked like you could slid a screw driver under/between the layers?? Not good! I wish i had taken a picture now.
Ron
RAmotorsports
#38
Posted 06-08-2020 09:34 AM
Spent the weekend(June 5,6,7) at Laguna Seca as SCCA was allowed to run their event. Despite the mask police(you got 2 warnings and then were kicked out)and every competitor was only allowed 1 guest or crew...it was good to get back out!!
I'm hoping this isnt the norm but I saw several sets of SM7.5 with tread separation??? One set had a couple tires with "chunks" missing...2" in diameter and almost to the cord. These tires had 5 cycles. The other set I saw on the discard pile at the tire mounter...2 tire were very "de-laminated". 10" sections of the tire it looked like you could slid a screw driver under/between the layers?? Not good! I wish i had taken a picture now.
great
I think Rich powers had that issue the first weekend out and told him it was a mold issue or something? Loading up some more sm7's
East Street Auto Parts
Jim@Eaststreet.com
800 700 9080
#39
Posted 06-08-2020 09:56 AM
I cant speak to the set I saw on the dump pile...but the set that had chunks missing were probably purchased early on in production.
Ron
RAmotorsports
#40
Posted 06-08-2020 10:29 AM
great
I think Rich powers had that issue the first weekend out and told him it was a mold issue or something? Loading up some more sm7's
Start the PO7.5 agreement process then, go to the SM7 card. Hopefully Hoosier will have enough spares to cover those of us that will be on 7.5.
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users