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tire size change

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Old Jan 11, 2010 | 04:39 PM
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Fish mojo's Avatar
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tire size change

I have an 06 F350 Lariat with the 18" wheels. Have the stock lt275/70R18 Conti's. I want some new Michelin's- I found a set of Lt275/65/R18's E rated for a great price. I think the width is the same- just 1 inch lower in diameter.
Will this work. Any issues?

Will it look odd?
Thanks.
 
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Old Jan 11, 2010 | 06:43 PM
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Are you sure they are 1" smaller?? Unless you posted a mistake the only difference i see is 275/75R18 & 275/70R18. The "75 & 70" is the distance between the rim and tread.
 
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Old Jan 11, 2010 | 09:08 PM
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Originally Posted by Fish mojo
I have an 06 F350 Lariat with the 18" wheels. Have the stock lt275/70R18 Conti's. I want some new Michelin's- I found a set of Lt275/65/R18's E rated for a great price. I think the width is the same- just 1 inch lower in diameter.
Will this work. Any issues?

Will it look odd?
Thanks.
speedo will be off a little.. at 65 reading, you will be doing about 63..
so says the discount tire calculator

section width is the same
Sam
 
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Old Jan 11, 2010 | 09:13 PM
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Originally Posted by rjfetz1
Are you sure they are 1" smaller?? Unless you posted a mistake the only difference i see is 275/75R18 & 275/70R18. The "75 & 70" is the distance between the rim and tread.
right, thats part of the diameter ( 2 of these)..

275 * 70% of width (192/5 mm) vs 275 * 65% of width (178.5 mm)

192.5-178.5 = 14. 14/25.4 mm/in = 1/2+ (*2) = 1in+

Sam
 
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