RPM Change

[richamer1]

I would like to drop my RPM a little on the occassion I need to drive on the interstate. I currently have 245/60/15 tires on the back. I wanted to make sure I was thinking right on this. I first thought a taller tire would decrease my RPM but now I am not sure. Taller or shorter to decrease RPM at say 60 ? :-k

 

[tiedyemike8]

A taller tire will lower your cruising rpm. Search google for an rpm calculator. you can enter different tire heights and see what the effect on engine rpm will be.

 

[bowtie81]

x2

 

[scuba_steve's_bu]

taller tire=lower rpm
shorter tire=higher rpm
kinda confusing lol

 

[Doober]

Note a taller tire will also slow acceleration some. Depending on what gear you have will affect the difference you "feel".

 

[1981Regal]

Tires can fine tune your rpm dont expect to it lower your rpm alot. It can vary a few hundred depending on the outter diamater height. You may also consider that a different tire will also effect your speedometer reading.