924S tire size
Pro
Joined: Nov 2003
Posts: 622
Likes: 3
From: Calgary, AB
Originally Posted by Eric Schall
How competitve are you guys with your 924s's in autocross?
Steve
Addict
Rennlist Member
Rennlist Member
Joined: Mar 2004
Posts: 8
Likes: 0
Yep, I am not suprised by that. There is a Toyota MR2 in our region that is not only winning E Stock but usally has the FTD or close to it. I my case it must be the driver and not the car!!
Still looking for set up advise!
Eric
Still looking for set up advise!
Eric
Track Day
Joined: Oct 2012
Posts: 20
Likes: 0
From: Suwanee, Georgia
Tires for 924S
I have the 15 inch phone dials on my 1988 924S. I've seen on this site that I can run 205/50/15 on it for track use, but would that lower the car too much for the street? When I read the specs my current 195/65/15s have a circumference 0f 25.1 inches but the 205/50s show at 23.1. That seems like it means that the car would run two inches lower, is that correct?
Burning Brakes
Joined: Jun 2006
Posts: 793
Likes: 58
From: Here
Holy 9 year old thread!
I use this tire calculator. It's excellent.
Looks like the circumference (the measurement if you wrapped a tape around the outside) is 7.6% smaller with the 205s. That means at 100mph on your speedo, you're actually going 92.4mph.
For the height change, you look at the radius - the distance from the axle center to the ground. The top doesn't matter. The car will sit 1" lower, and have a 1" larger fender gap.
Hope that helps.
I use this tire calculator. It's excellent.
Looks like the circumference (the measurement if you wrapped a tape around the outside) is 7.6% smaller with the 205s. That means at 100mph on your speedo, you're actually going 92.4mph.
For the height change, you look at the radius - the distance from the axle center to the ground. The top doesn't matter. The car will sit 1" lower, and have a 1" larger fender gap.
Hope that helps.
