Subaru Enthusiasts Car Club of the Sierras - View Single Post

Dean · 2004-01-08, 01:01 PM

Actually, 225/45-17, and 245/40-17 have almost the same circumfrence. OK, there is about an inch difference which corelates to less than 1% difference in speed.

Here is a really great tire calculator for this stuff.

http://www.miata.net/garage/tirecalc.html

And actually, it is the 245/40-17 that Falken doesn't make. I think you have to go to the Kumho to get a 245/40-17.

The big tire/gearing advantage is in the 16" race tires for the WRX. If I am not mistaken Hoosier makes those 215/40-16s which have a diameter that is almost a full two inches smaller than the stockers or the 17"s above.

2004-01-08, 01:01 PM	#14
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	Actually, 225/45-17, and 245/40-17 have almost the same circumfrence. OK, there is about an inch difference which corelates to less than 1% difference in speed. Here is a really great tire calculator for this stuff. http://www.miata.net/garage/tirecalc.html And actually, it is the 245/40-17 that Falken doesn't make. I think you have to go to the Kumho to get a 245/40-17. The big tire/gearing advantage is in the 16" race tires for the WRX. If I am not mistaken Hoosier makes those 215/40-16s which have a diameter that is almost a full two inches smaller than the stockers or the 17"s above. __________________ I am a Commodore PET --- Now get off my lawn you kids...