Beretta.net

As i was looking for suspension parts I came across this, I knew nothing about tire sizes.  This answered some of my questions, hope it will help others:

Reading Tire Sizes:  

Example Size:  
P205/60R-15OWL  

P - Passenger  

Tire sizes can also start with the following:  

BP - Cosmetic Blemish Passenger  
LT - Light Truck  

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205 - Width in millimeters of tire's tread.  

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60 - Aspect Ratio - Percentage of tread width that equals the sidewall height.  

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R - Radial  

The letter "R" can also include the following:  

HR - H=Speed Rating  
VR - V=Speed Rating  
ZR - Z=Speed Rating  

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15 - Rim diameter in inches.  

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OWL - Outlined White Lettering  

Other letter combinations include:  

RWL - Raised White Letters  
W - Whitewall  
B - Blackwall  
ORWL - Outlined Raised White Letters  
WW - White Wall  
BW - Black Wall  

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Tires can also be listed as:  
205/60R-15 93H  

93H - 93 Load Index, H Speed Rating  

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Light Truck (LT) sizes can
include a letter at the end of the size.  

LT265/75R-16/C  

C - Load Range

Here's a good link to easily figure the difference between tire sizes.

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

according to that calculator we can put 205/30/ R20 on
DAMMMMMMM!!!!!!