20inch wheels
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From: NOR CAL
It depends on the size of the tires you are going to use. If they are larger than it would effect your slow city driving, but it would help your highway milage because you will change the ratio and you will have lower rpms.
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Here is a quick calculator to check diameter
Originally Posted by kywildcat103
what will going from 18 inch wheels to 20 inch wheels do to gas mileage and will it change the speedometer? have 2004 f150 4x4 5.4 engine. thanks guys
The game is to decrease the size of the tire if you increase the wheel. I have seen alot of 285/50/20s on F-150s, but I went with the 275/55/20 to fill the wheel well more, and not look so ghetto. FWIW
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From: Austin TX
I like the calculator as seen on Discount Tire's web site. It'll tell you exactly what your speedometer will read versus your actual speed ... after changing wheel/tire sets:
http://www.discounttire.com/dtcs/infoTireMath.dos
http://www.discounttire.com/dtcs/infoTireMath.dos
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From: San Antonio, TX
Factory is 275/55/20, that's what mine are. 31.8 in tall just like a 275/65/18 or a 265/70/17. They're all the same overall height.
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From: Austin, TX
From a post on another f150 WEBSITE: The tire/rim combo is 90 lbs.
This is on the 20's with the Pirelli's.
This is on the 20's with the Pirelli's.
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Originally Posted by ArtsBest
Roman371: What are the factory 20" option specs? Are they 285/50/20 that you mentioned?
I have seen trucks with 285/50/20, which are ~31 inch diameter, or using 275/55/20 which are not as wide as the 285's but are slightly taller, having a diameter of 31.9 inches. I went with the 275's to have more of a stock look versus the 285's which have more of a street-truck look. You cannot go wrong with either size, or move up to the 305's for a beefier look altogether. Good luck.
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Jkbrad
Factory is 275/55/20, that's what mine are. 31.8 in tall just like a 275/65/18 or a 265/70/17. They're all the same overall height. You mean that a factory set of 20" is the SAME height as say the 18" factory setup? That's strange. I saw an 07' Avalanche with the 20" setup, right next to it was an 06' with the 18" version and the 07' model tires height is TALLER than the 06'. NOT in any way the same overall height.
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From: San Antonio, TX
Try this. Go to www.tirerack.com and look up the specs on these tires. You will see that they are all within .2 in of overall height. All of the factory tire/wheel combos listed above on F150 4x4s are the same overall height.
I don't know what GM does with their trucks. I know an '06 Avalanche and an '07 are not the same vehicle. The '07 is all new. That may have something to do with it.
I don't know what GM does with their trucks. I know an '06 Avalanche and an '07 are not the same vehicle. The '07 is all new. That may have something to do with it.
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The 07" 20" rim/tire set up is NO taller than the 18" setup. The former has LARGER rims but the sidewall on that accompanying tire is SHORTER just as you stated. The net effect "wash" each other out. IN that there is NO difference in height. You're most correct, I was wrong. 20" sounds TALLER though.
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