tire size

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Mar 17, 2006 | 12:27 AM

06 XL F-150

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tire size

i wantedto get some bf goodrich all terrains for my fx4 18" wheels the stock size tires are 275 65 r18 .. I believe that the only size that i can get these tires in is 285 65 r15 is that gona be muchof a difference in width? I wanna keep them as close to stock size as possible. especially the height. a little wider dosent botherme i just dont wanna go changing my speedo. Also i dont want them to be too wide for my wheels. Thanks for any help.

Mar 17, 2006 | 07:51 AM

stangmanRR

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I hope that you meant 285/65/18 instead of 285/65/15. Because the 15 will not work on you 18 in wheel. The width should be the same (the 65, which is a ratio of width and height of sidewall). The 285 measure the circumference of the tire so it will be a bit taller than a 275. But not by much. Im sure if you do a search on tire sizes you will find a thread that answers all the questions you have. May even find pics.

Mar 17, 2006 | 11:05 AM

triple8

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From: SE Michigan

stangmanRR I think I am reading something wrong.

275 is the width in millimeters, 65 is the percentage aof the width between the wheel and the ground, last numkber is wheel size.

So a 275/65/18 is by math 10.8" wide, 32" tall an fits on an 18" diameter wheel. Likewise a 285/65/18 by math is 11.2" wide 32.58 tall and fits on a 18" diameter wheel.

All of the places I have looked show a price of $240 per tore for the 285-18 BFG's. Way to pricey in my book for a tire 10mm or .4" wider and .6" taller.

Mar 17, 2006 | 11:26 AM

stangmanRR

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triple- exactly right, I was off my rocker with the first #. The second is the aspect ratio. So on a 275/65/18 , the aspect ration is .65 so .65*275=178.75, and this is the height of the side wall. Multiply 178.75*2 =357.5, convert this number to inches and get: approx 14in and add to 18 in wheel diameter and get a total diameter of 32 inches.

Shorry about the whole circumference thing, Like i said I was off my rocker/

Mar 18, 2006 | 09:29 PM

06 XL F-150

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ok i got that but i guess my question really is.. would 10.5 or whatever with a 285 width be too wide for my stock fx4wheels? thanks for the answers tho.

Mar 19, 2006 | 11:53 AM

motleycruef150

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Your stock rims are 7.5" wide. The recommended rim width for these tires are 8" to 10".

http://www.bfgoodrichtires.com/assets/pdf/all_terrain_ta_kd.pdf

Last edited by motleycruef150; Mar 19, 2006 at 12:17 PM.