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Old 03-29-2022   #11
Jagdpanzer
 
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Default Re: Ideal size for aftermarket wheels?

285/35-18 up front, 325/30-19 on back


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Old 03-29-2022   #12
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Default Re: Ideal size for aftermarket wheels?

Quote:
Originally Posted by Jagdpanzer View Post
285/35-18 up front, 325/30-19 on back


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I second.
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Old 03-30-2022   #13
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Default Re: Ideal size for aftermarket wheels?

How much speedo correction do you have to make with 19's in the rear? After really struggling to find tires for my Shelby Series 1's I'm thinking of a change as well.
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Old 03-31-2022   #14
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Default Ideal size for aftermarket wheels?

Quote:
Originally Posted by Fully Vetted View Post
How much speedo correction do you have to make with 19's in the rear? After really struggling to find tires for my Shelby Series 1's I'm thinking of a change as well.


It depends of what size tires you decide on in 19?. Here is an example using the tire calculator to get as close as possible to stock size overall diameter.


https://www.tyresizecalculator.com/


https://tiresize.com/speedometer-calibration/


Image1648726660.741177.jpg


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Last edited by HAWAIIZR-1; 03-31-2022 at 07:53 AM.
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Old 03-31-2022   #15
XfireZ51
 
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Default Re: Ideal size for aftermarket wheels?

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Originally Posted by Fully Vetted View Post
How much speedo correction do you have to make with 19's in the rear? After really struggling to find tires for my Shelby Series 1's I'm thinking of a change as well.
With 325x19s, my speedo is 3mph too high at 70-80mph.
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Old 04-01-2022   #16
HAWAIIZR-1
 
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Default Re: Ideal size for aftermarket wheels?

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With 325x19s, my speedo is 3mph too high at 70-80mph.


Dom, Do you use a GPS speedo and compare it to your car speedo to figure out the difference?


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Old 04-01-2022   #17
Jagdpanzer
 
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Default Re: Ideal size for aftermarket wheels?

I use a speed app on my IPhone.
With the speed sender gear set I have installed the the speedometer error is within 1 mph of actual at 65-75 mph of road speed.


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Old 04-02-2022   #18
HAWAIIZR-1
 
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Default Re: Ideal size for aftermarket wheels?

Quote:
Originally Posted by Jagdpanzer View Post
I use a speed app on my IPhone.
With the speed sender gear set I have installed the the speedometer error is within 1 mph of actual at 65-75 mph of road speed.


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Cool! I have one one my phone that I have clocked the bullet train here at 186 mph. I will try to check mine one day.


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Old 04-02-2022   #19
XfireZ51
 
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Default Re: Ideal size for aftermarket wheels?

Quote:
Originally Posted by HAWAIIZR-1 View Post
Dom, Do you use a GPS speedo and compare it to your car speedo to figure out the difference?


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Yes I do. Its pretty consistent 3mph difference(actual is lower) when at indicated 70-80mph, which is close enough for horseshoes and hand grenades. 🤣🤣
Craig, I also used the GPS to measure TGV going under English Channel at 311kph. Why the hell we don?t have trains like that here is a crime.
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