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Old 07-07-2016, 04:32 PM   #1
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tire size question

i have a 2015 eco base. plan to lower it soon but i have just got a set of 18x8 rims from a different eco. i need to purchase tires but want a bigger tire than what came on them to reduce some of the wheel gap. was wondering what sizes everyone recommended. if you have any pics with 18x8 please post and let me kno the tire size thanks!
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Old 07-07-2016, 05:52 PM   #2
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This is my Ecoboost with its winter tire/wheels. The rims are 18x8 and the tires are 225/55. I plan to replace the winter tires with the stock 18" size winters in 235/50 when they are warn out.

My car is a performance package cars so my summer tires are 255/40-19
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Old 07-07-2016, 11:33 PM   #3
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Nice! I'll go with 255/40 then. I wonder how much wheel gap that would leave?
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Old 07-09-2016, 09:48 AM   #4
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A 255/40-18 will give you more gap than the stock tires because it's over diameter is about 1 inch shorter. Plus 8" wide wheel is to narrow for a 255 tire.

You should play around at Tire Rack and look for a tire that is 27" or little more that is not to wide for your wheels.
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Old 07-09-2016, 06:13 PM   #5
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I'm not sure I understand. 255 is to wide for 8" wide rim? My friend has the same car as me with a different set of 18x8 with 275/35 and fit fine. Probably wouldn't fit much more. But also on tire rack they say a 8" will fit 255 and 245 so I'm not sure I understand. No disrespect I'm just not sure I understand.
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Old 07-09-2016, 09:12 PM   #6
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Quote:
Originally Posted by 2867rECO View Post
I'm not sure I understand. 255 is to wide for 8" wide rim? My friend has the same car as me with a different set of 18x8 with 275/35 and fit fine. Probably wouldn't fit much more. But also on tire rack they say a 8" will fit 255 and 245 so I'm not sure I understand. No disrespect I'm just not sure I understand.
Typically, 8.5" wide rim is smallest recommended with 255/40 and 8" wide when it's a 255/45. In other words the lower profile of the 255/40 doesn't want to be squeezed as much. (There are exceptions but that's generally what they show.)

Regarding the larger dia tires to reduce wheel gap, you know that will affect you speedometer and other related items right? So you would need to correct the tire size in the computer if it's above the 2 to 3% generally suggested as the max difference.

Why not just rely on the lowering to take care of it?

EDIT: You may think a 275/35 fits fine. Look up the effects of having a too wide of a tire on a rim.
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Old 07-10-2016, 09:39 AM   #7
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Ok got ya. So what size am I looking at on the 18x8? A 245? And my tuner can adjust my speedo for me it's not biggie at all.
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Old 07-10-2016, 11:46 AM   #8
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A 245/50 will be a little taller than stock. A 245/45 will be a little shorter.
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Old 07-10-2016, 01:27 PM   #9
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Got ya I'll go with a 245/50 then! Thank u very much for the help!!
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