speed loss with bigger rims?

[ross the hoss99]

Does anyone have any info on what kind of speed loss i would experience when going from the stock wheels to 20 in. rims, with a 5.4L v8? Is it even noticeable? Thanks

[rockyj]

I have a 2003 F-150 4.6L and I just put a set of 20x9 inch wheels with 285/50/20 tires and it slowed mine down. It's not a huge difference but it is noticeable. My truck has 3.08 gears so I ordered a set of 3.73 gears and a superchip 1715 tuner today to see if this will help.

2003 F-150 4.6L
K&N Air filter
throttle body spacer
Gibson cat-back exhaust
DJM 2'' lowering shackles
Edelbrock Performer IAS shocks
Tinted windows
Ventshades
Superchip 1715 & 3.73 gears(on the way)

[Robdude30]

I've got the 5.4 and 20's on my SuperCrew and also noticed a difference. It "feels" a little slower, but I don't know by how much. In my case, looks are more important than speed, so I don't mind it a bit.

I noticed an improvement in handling, mostly due to a stiffer /wider tire (I'm guessing), which is a good side benefit.

[max mitchell]

It costs you in power to the ground and you notice it.

[UncBob]

Depends on what tires you use

If you are close to the same tire height the difference will not be as great .
Weight will be the main difference not the effective new gear ratio which should remain the same if the height is the same

[J-150]

but on the bright side, you have a faster top speed....