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I need help with rim sizes

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Old 09-12-11, 01:50 AM
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William114
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Default I need help with rim sizes

my tires are 275,50,17 in the back, in the front it is 255,50,17
and i seen rims on this site and it gives me options 17x7, 17x7.5. I dont know what the second number is, (7 and 7.5) i dont know what will fit my tires, can you guys tell me a list of sizes i can use for tires so i know what to search for? thank you, much appreciated.
Old 09-12-11, 02:05 AM
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SaintNexus
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Welcome to CL.

What car you got?
Old 09-12-11, 02:39 AM
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William114
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Originally Posted by Incredible
Welcome to CL.

What car you got?
thank you, I got a 2005 Ford Mustang 4.0 V6.
Old 09-12-11, 02:58 AM
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William114
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if anyone could help me, that would mean a lot considering the fact cars arent my expertise, so would i be able to run 17x8 on a 275/50/17 ?
Old 09-12-11, 04:06 AM
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T0ked
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In short, no. The second number is the width of the rim in inches. On an 8" wide rim, you would be looking at tires in the 235-245 range. Your 275 tire wouldn't even fit on the rim as the tire bead would never lock and seal (If they did, it would be dangerous and I would be scared to used it). My S550 has 275 tires on the back and it is a 19x9.5 rim.
Old 09-12-11, 12:38 PM
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William114
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Originally Posted by T0ked
In short, no. The second number is the width of the rim in inches. On an 8" wide rim, you would be looking at tires in the 235-245 range. Your 275 tire wouldn't even fit on the rim as the tire bead would never lock and seal (If they did, it would be dangerous and I would be scared to used it). My S550 has 275 tires on the back and it is a 19x9.5 rim.
how do i find out the size of my rims? the previous owner put custom chrome rims on the 275. i dont know how big the rim is or the width.
Old 09-12-11, 01:46 PM
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Brian@Vossen
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Originally Posted by William114
how do i find out the size of my rims? the previous owner put custom chrome rims on the 275. i dont know how big the rim is or the width.
If you jack the car up or slide under the car and look inside the wheel it should indicate the size....17x8, 17x8.5 etc....
Old 09-12-11, 02:38 PM
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William114
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Originally Posted by Mike@Vossen
If you jack the car up or slide under the car and look inside the wheel it should indicate the size....17x8, 17x8.5 etc....
oh man, thank you so much! thank you finally! and one question can you work a bit higher in size or smaller ? is it bad or just not preferred?
Old 09-13-11, 08:12 AM
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You can change any and all size of the rim but you'll need the right tires. Main goal is to keep the overall diameter of the wheel (rim+tire) the same. Bigger rim (17" -> 18") you'll need lower profile tires (thinner sidewall). If you change the wheel diameter, you risk rubbing the body panels, the speedometer not reading your speed accurately, changes in handling dynamics, etc. You can also change the width of the rims but like I said above, there is an acceptable range where above or below it can be dangerous.

Easy way to measure rim is to stick a ruler thought the spokes and measure from lip to lip. Gives you a rough estimate. Sometimes looking for that small number can be a b!!!!.
Old 09-13-11, 11:49 AM
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Brian@Vossen
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Originally Posted by William114
oh man, thank you so much! thank you finally! and one question can you work a bit higher in size or smaller ? is it bad or just not preferred?
You are welcome.

Originally Posted by T0ked
You can change any and all size of the rim but you'll need the right tires. Main goal is to keep the overall diameter of the wheel (rim+tire) the same. Bigger rim (17" -> 18") you'll need lower profile tires (thinner sidewall). If you change the wheel diameter, you risk rubbing the body panels, the speedometer not reading your speed accurately, changes in handling dynamics, etc. You can also change the width of the rims but like I said above, there is an acceptable range where above or below it can be dangerous.

Easy way to measure rim is to stick a ruler thought the spokes and measure from lip to lip. Gives you a rough estimate. Sometimes looking for that small number can be a b!!!!.
Good post.
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