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I have 245/45/20 tires on the front and want to fit wider tires in the rear as I have 10 inches wide rims. I was planning putting 295/45/20 in the rear but based on the aspect ratio they will look taller than the front. Is that correct? Should I place 295/40/20 in the rear instead? Any other recommendation?
 

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I know that a 275/40x20 is almost the same exact height as the 245/45 and that is the combination I run.

But you'd definitely want something a bit wider to go with those 10" wide rims.

A 245/45x20 tire is 28.7" tall and 9.6" wide with a 4.3" sidewall.

A 295/40x20 tire is 29.3" tall and 11.6" wide with a 4.6" sidewall. That's close. The speedometer error on the 294/40 would be 1.5 MPH at 70 MPH.

I ran through some other sizes, 315/45, 305/45 & 295/45, and the 295/40 is as close to the same size as the 245/45 I could find unless you go with a narrower 275/40.
 

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Discussion Starter #3
I know that a 275/40x20 is almost the same exact height as the 245/45 and that is the combination I run.

But you'd definitely want something a bit wider to go with those 10" wide rims.

A 245/45x20 tire is 28.7" tall and 9.6" wide with a 4.3" sidewall.

A 295/40x20 tire is 29.3" tall and 11.6" wide with a 4.6" sidewall. That's close. The speedometer error on the 294/40 would be 1.5 MPH at 70 MPH.

I ran through some other sizes, 315/45, 305/45 & 295/45, and the 295/40 is as close to the same size as the 245/45 I could find unless you go with a narrower 275/40.
Thanks, that was very helpful.
 

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Discussion Starter #4
I know that a 275/40x20 is almost the same exact height as the 245/45 and that is the combination I run.

But you'd definitely want something a bit wider to go with those 10" wide rims.

A 245/45x20 tire is 28.7" tall and 9.6" wide with a 4.3" sidewall.

A 295/40x20 tire is 29.3" tall and 11.6" wide with a 4.6" sidewall. That's close. The speedometer error on the 294/40 would be 1.5 MPH at 70 MPH.

I ran through some other sizes, 315/45, 305/45 & 295/45, and the 295/40 is as close to the same size as the 245/45 I could find unless you go with a narrower 275/40.
BTW, just for curiosity. How do you calculate the speedometer error?
 
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