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Old 11-14-2015, 11:33 PM   #1
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305 tire profile. 30 or 35?

Hi,

I am trying to enlarge my rear tire but don't know which size to go for.
My OEM size is 265/35/R20, and I'm trying to go for 305mm wide tires.
I saw on AM that they recommend 305/35/R20.

After doing a wheel/tire calculation, I found that 305/35/20 will cause a quite significant odometer difference, which concerns me.
However, a 305/30/20 will solve the issue, almost no odometer error.

I know there must be a reason why AM recommends the higher 35 profile. Could anyone explain this to me, please? And which profile should I go for?

Thanks so much!

Tire calculation link: Rim & Tire Size Calculator. Custom Offsets - Wheel-Size.com
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Old 11-15-2015, 03:13 PM   #2
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More rotating mass = speedo being thrown out of whack. If you're concerned, you can always have this recalibrated through a decent tune, or a speedo recalibration box/device. I am running 315/35/17 on the back of my 2000 GT but I have a DSS speedo recalibration box hooked up to my gearing and tire size. All is well.
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Old 11-15-2015, 04:56 PM   #3
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Quote:
Originally Posted by weiyuhan View Post
Hi,

I am trying to enlarge my rear tire but don't know which size to go for.
My OEM size is 265/35/R20, and I'm trying to go for 305mm wide tires.
I saw on AM that they recommend 305/35/R20.

After doing a wheel/tire calculation, I found that 305/35/20 will cause a quite significant odometer difference, which concerns me.
However, a 305/30/20 will solve the issue, almost no odometer error.

I know there must be a reason why AM recommends the higher 35 profile. Could anyone explain this to me, please? And which profile should I go for?

Thanks so much!
Where/how does AM recommend the 305/35/20 to replace the 265/35/R20?
Why not ask them why that is?
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Old 11-15-2015, 05:00 PM   #4
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A 305 is not going to fit on the stock wheel. You need new wheels also


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Old 11-15-2015, 05:05 PM   #5
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Tire sizes and wheel sizes differ at times as far as combinations...but I am running 315/35/17 on a 10.5 inch wheel and 275/35/17 on a 9 inch wheel. If that provides any perspective...
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Old 11-15-2015, 05:07 PM   #6
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A 305 is not going to fit on the stock wheel. You need new wheels also


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Old 11-15-2015, 06:04 PM   #7
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yup im getting new wheels as well.
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Old 11-15-2015, 06:06 PM   #8
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Quote:
Originally Posted by weiyuhan View Post
yup im getting new wheels as well.

Well, now we're making sense lol


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