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>okay can some one explain then why the speedometer will be >off if you go from RS 14"rims to GS/GST 16" rims if the rs >speedo and the gst speedo both say 1025rev=1mile on them.
Well, an RS 14" rim and a GS/GST 16" rim actually has the same diameter. The 14's are wrapped in 65's and the 16's are wrapped in 55's. Well, i'm not sure if those are the right specs for the tires, but if you took one of each rim and stood them next to each other, they would be the same height. Basically the thickness of the tire keeps the rims at the same diameter.
The problem is with aftermarket rims. Hmm.. how to explain this best. It's in the circumference of the wheel. Ok, let's say, if it were somehow possible to mount 2 inch rimes on your car... because the revolution is so small, the tires would revolve like five billion times faster then normal and the speedo would read a much faster speed. And vice versa for really large rims.
Blah, I give up, read this http://www.howstuffworks.com/gear-ratio.htm and just keep in mind that the tire itself works like a gear with the rest of the tranny.
But keep in mind, if you can maintain a wheel diameter close to stock, you could still rock 18's and 19's... the tire itself would just have to be really thin.
 16.1 @ 87.11 http://www.virtuallyinfamous.com
ARD 57mm tb and p&p manifold, Neuspeed STB, Pro-kits, Illuminas, Injen CAI with K&N, 2.5" pacesetter catback, AF/X UDP, Rear STB, Powerslot rotors, RRE SS Brakelines.
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