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Old 07-11-2005, 07:11 PM   #1
Brando56894
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Good Tire Conversion Chart

hey guys my dad bought some 18's off of ebay and my bro was talkin with me about how they would look on my car and what i gotta measure and all that good stuff. we were searchin google for a lil while and couldnt find a good and easily usable tire conversion chart. the problem is the new rims will be set back farther then the current stock rims, and he told me to find an exact match between the current 16" tires that i have on there now and the tires i'll need to get. if anyone can recommend a good chart or can give me the tire numbers that i need i'd appriciate it. just in case heres the number off my tire 23555R16. thanks
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Old 07-11-2005, 11:11 PM   #2
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http://www.f-body.org/gears/
type in tire dimensions XXX/XX/18 and click calculate and it will give you the diameter in inches
for example: 235/55/16 = 26.17716535433071
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Old 07-11-2005, 11:19 PM   #3
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but how will that help me find the model (?) tire i need for the 18s?
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Old 07-12-2005, 08:19 AM   #4
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What size are the rims? 18" x ?" Are they made to fit your generation f-body?

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Old 07-12-2005, 06:28 PM   #5
Brando56894
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theyre 18"x8.5" and no they arent made to fit my car, my dads an eBay addict and bought them on a whim, just like he does everything else.... well actually I bent one of my stock rims a few weeks ago and hes been looking for replacements and these were a set of 4 18s for like $350 so he bought them. I wanna put them on my car but the thing is I dunno if they'll fit...
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Old 07-12-2005, 10:46 PM   #6
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what year is your car?...do you know the backspacing of the new wheels?
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99 Riviera, Bone stock, 14.34 @ 96 "Walking 5.0's in luxury" RIP
95 Cherokee, Bone stock 16.2 @ 83 "Treeing your 3rd gen and beating it to the line despite trapping less....and looking better"
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Old 07-13-2005, 12:17 AM   #7
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my car is a 2001 and i think the back spacing was around 6.5" or sumthin i forget, me and my bro figured it out though. i do remember that these new rims are set back like .5" more then the stock rims....
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Old 08-04-2005, 11:29 AM   #8
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If your guy is talking about finding the right tire size for the 18's to match the height of the 16's, then go to the following link:

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