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When you guys talk about rims and tires what do all those numbers mean, well obviouslly i know what 17'' s and stuff mean but the tire measurements what do they mean?

Ken Tran
91 White sedan
 

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502MotorSports.com
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http://www.tyresave.co.uk/tyresize.html

wheel
EX: 18 x 7.5, +45mm offset

18" diameter
7.5" width
+45mm offset (stock offset is +65mm)
You will learn alot about offset....
The lower the number is...or closer to 0mm, the closer the wheel will sit outside of your wheel well.

tire

width/sidewall height/diameter
225=width
40=sidewall height (the part you see from the side)
18=tire/wheel diameter
225/40ZR/18

The ZR = speedrating...you will notice most tires have a speedrating...Z-rated tires are rated for speeds up to 149mph
 
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