Tire spec i got from toyo.com
245/40R19 Overall diameter 26.7
265/30R19 Overall diameter 25.4
1-(26.7/25.4)=0.048

 

check your math again, 1-(26.7/25.4)=0.051

 

Oops..
I put in 25.4/26.7 instead of 26.7/25.4
Formula should be 1-(25.4/26.7)=0.048

Either way it's about 5% which I don't really care.
If you think it's a big difference then you stick with the OEM size.

 

how do you like it? any problems with wheel damage or uneven height?

 

I don't feel there are too much ride difference than my oem tires...
I really don't like the OEM Bridgestone RE050 225/40R19 and 245/40R19.
The new size sticks much better too since it's about 1" wider at the rear.

But if given the chooce again I would go for 245/40R19F and 275/35R19R because i do think the side wall is too thin.
I was given a crazy deal on these sizes and I was desperatly wanted to get rid of my OEM tires so I got these tires.
So it's totally up to you.... Just get what ever suites your budget.

 

you'll be safe with a 245/35F and 255/40R. thats what im running with on my OEM 19's.

 

do you have any pix of the sidewall with 275/30 or 265/30? I could only find 275/35 around the site... is it really that thin? i don't want to ride around on rubber bands!

 

275/35R19 has the same overall diameter as OEM 245/40R19 so that's why most people go for that size.
I will post pic if i can dig one up...