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Old 04-16-2003, 11:47 PM   #1
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Default Tire Numeral Ratings

Ok guys..i don't want to sound like a dumbass or anything here but what does each number stand for in tire size'*..??

For example my tires are 215/45/ZR17

obiously the 17 stands for 17" due to the size of my rims...but the 215 and the 45 is whats confusing me. Help the newb..
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Old 04-17-2003, 12:20 AM   #2
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yes, the 215 is the width while the 45 is the aspect ratio from width to height
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Old 04-18-2003, 01:44 AM   #3
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yeah, so you're tire is 215 mm across (8 3/4 inches) across the treads, and 96.75 mm (~4 inches) from inner diameter to outer diameter (ie sidewall height). This makes for a wheel and tire combo 24.9 inches high form top to bottom. Fun with math, yeah.
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