C7 GS Pirelli Scrubs - Potential ABS issue?
Thread Starter
Instructor
Joined: Jul 2019
Posts: 194
Likes: 7
From: Suburbs - Chicago
C7 GS Pirelli Scrubs - Potential ABS issue?
Hi Everyone,
I was curious if someone can let me know if the below tire sizes will cause me any ABS issues? I can get the following scrub tires for my 18" track wheels -
Pirelli 305/645/18 on a 18x11 tire diameter: 25.2"
Pirelli 325/680/18 on a 18x12.5 tire diameter: 26.76"
- I calculated a 1.0619 ratio - is this OK with the C7s ABS system. I think the allowable range is 1.03-1.06?
Or I can get:
Pirelli 305/660/18 tire diameter: 26"
Pirelli 325/705/18 tire diameter: 27.75"
Thank you for your help!
I was curious if someone can let me know if the below tire sizes will cause me any ABS issues? I can get the following scrub tires for my 18" track wheels -
Pirelli 305/645/18 on a 18x11 tire diameter: 25.2"
Pirelli 325/680/18 on a 18x12.5 tire diameter: 26.76"
- I calculated a 1.0619 ratio - is this OK with the C7s ABS system. I think the allowable range is 1.03-1.06?
Or I can get:
Pirelli 305/660/18 tire diameter: 26"
Pirelli 325/705/18 tire diameter: 27.75"
Thank you for your help!
Tech Contributor
Joined: Oct 1999
Posts: 41,062
Likes: 9,824
From: Charlotte, NC (formerly Endicott, NY)
Hi Everyone,
I was curious if someone can let me know if the below tire sizes will cause me any ABS issues? I can get the following scrub tires for my 18" track wheels -
Pirelli 305/645/18 on a 18x11 tire diameter: 25.2"
Pirelli 325/680/18 on a 18x12.5 tire diameter: 26.76"
- I calculated a 1.0619 ratio - is this OK with the C7s ABS system. I think the allowable range is 1.03-1.06?
Or I can get:
Pirelli 305/660/18 tire diameter: 26"
Pirelli 325/705/18 tire diameter: 27.75"
Thank you for your help!
I was curious if someone can let me know if the below tire sizes will cause me any ABS issues? I can get the following scrub tires for my 18" track wheels -
Pirelli 305/645/18 on a 18x11 tire diameter: 25.2"
Pirelli 325/680/18 on a 18x12.5 tire diameter: 26.76"
- I calculated a 1.0619 ratio - is this OK with the C7s ABS system. I think the allowable range is 1.03-1.06?
Or I can get:
Pirelli 305/660/18 tire diameter: 26"
Pirelli 325/705/18 tire diameter: 27.75"
Thank you for your help!
Bill
Thread Starter
Instructor
Joined: Jul 2019
Posts: 194
Likes: 7
From: Suburbs - Chicago
Thank you very much Bill much appreciated!
Sr.Random input generator
Joined: Jan 2008
Posts: 7,811
Likes: 2,236
From: Sammamish, WA
I don't think ANY size will cause ABS issues on any C7, neither on C5, C6, etc. I think it's the same for stability control, too.
Now, traction control was a bit too sensitive on C5/6, but is a lot less sensitive on C7. I even drove the C7 with square tires to be honest, and only Touring mode seemed to be too sensitive to tire slips; I had no issues at the track in track mode.
In short, considering you'd very likely be using track tires in track mode, I don't think you need to worry about any of this at all.At least in my experience, any ratio worked just fine at the track (though extreme cases like the square setup had sensitive TC at the street in Touring mode).
Now, traction control was a bit too sensitive on C5/6, but is a lot less sensitive on C7. I even drove the C7 with square tires to be honest, and only Touring mode seemed to be too sensitive to tire slips; I had no issues at the track in track mode.
In short, considering you'd very likely be using track tires in track mode, I don't think you need to worry about any of this at all.At least in my experience, any ratio worked just fine at the track (though extreme cases like the square setup had sensitive TC at the street in Touring mode).
Thread Starter
Instructor
Joined: Jul 2019
Posts: 194
Likes: 7
From: Suburbs - Chicago
I don't think ANY size will cause ABS issues on any C7, neither on C5, C6, etc. I think it's the same for stability control, too.
Now, traction control was a bit too sensitive on C5/6, but is a lot less sensitive on C7. I even drove the C7 with square tires to be honest, and only Touring mode seemed to be too sensitive to tire slips; I had no issues at the track in track mode.
In short, considering you'd very likely be using track tires in track mode, I don't think you need to worry about any of this at all.At least in my experience, any ratio worked just fine at the track (though extreme cases like the square setup had sensitive TC at the street in Touring mode).
Now, traction control was a bit too sensitive on C5/6, but is a lot less sensitive on C7. I even drove the C7 with square tires to be honest, and only Touring mode seemed to be too sensitive to tire slips; I had no issues at the track in track mode.
In short, considering you'd very likely be using track tires in track mode, I don't think you need to worry about any of this at all.At least in my experience, any ratio worked just fine at the track (though extreme cases like the square setup had sensitive TC at the street in Touring mode).
